Introduction. Deep Groove Ball Bearings. Angular Contact Ball Bearings. 1

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2 Introduction Deep Groove Ball Bearings At Axis, we build exceptionally close tolerances into our bearings. Instead of the usual ABEC 1, we manufacture every Axis bearing to meet or exceed ABEC 3 tolerances. We use grade 10 balls, normally found in ABEC 5 (or better), instead of grade 25. This insures a rounder, more precise diameter ball and gives longer life because the balls share the load evenly. All Axis deep groove ball bearings are noise and vibration tested. We use Polyrex EM grease that has become the lubricant of choice for the electric motor industry. In addition, we use high strength, temperature resistant steel as standard in our retainers. All of these features add up to longer life. Angular Contact Ball Bearings All Axis angular contact ball bearings meet or exceed ABEC 5 tolerances. They feature forged rings for superior grain structure. The machined bronze retainer provides superior strength and heat dissipation. They come with a 40-degree contact angle for high thrust load capacity. All Axis angular contact ball bearings are universally flush ground allowing them to be paired in any configuration your application demands. 1

3 RADIAL BALL BEARING Part Number Breakdown RS EMQ 608 ZZ M6203 2RSNRPC3 EMQ Double Row Ball...p p. 12 Single Row Ball...pp DESIGN CODE M Blank Narrow Double Row Self-Aligning Ball Double Row Self-Aligning Ball Double Row Angular Contact Ball Metric Width Double Row Self-Aligning Ball Double Row Angular Contact Ball Single Row Deep Groove Ball Max Type Standard DIAMETER/CROSS SECTION CODE Lightest Heaviest...pp pp p p p p p p pp pp pp pp Blank - Standard Quality EMQ - Electric Motor Quality Noise & Vibration Checked INTERNAL CLEARANCE C2 CO or Blank - Standard C3 C4 CAGE CODE Blank - Steel P - Plastic M - Machined Brass Least Clearance Most Clearance NR - Snap Ring on O.D. Blank - Standard (No Snap Ring) BORE DIAMETER CODE One Digit # = Bore in mm mm 12mm 15mm 17mm 04 & Above x 5 = Bore in mm PROTECTION CODE Blank Z ZZ RS 2RS Open Shield Shields Both Sides Seal One Side Sealed Both Sides Radial Inch Dimensional Ball ZZ...p. 8 Blank - Open ZZ - Shielded 2RS - Sealed BORE SIZE See Dimension Tables 2

4 ANGULAR CONTACT BEARING Part Number Breakdown B C MP TB P4 UA DUL Angular Contact Spindle Bearings...pp pp END PLAY DESIGN CODE Single Row Angular Contact Ball Bearing DIAMETER/ CROSS SECTION CODE UA - U0 - UL - DUL DUM DUH Universally Flush Ground For Axial End Play Universally Flush Ground For No End Play Universally Flush Ground For Light Preload Duplex Pair For Light Preload Duplex Pair For Medium Preload Duplex Pair For Heavy Preload Lightest Heaviest PRECISION CODE P6 P5 P ISO P6 / ABEC 3 ISO P6 / ABEC 5 ISO P4 / ABEC 7 BORE DIAMETER CODE One Digit # = Bore in mm & Above x 10mm 12mm 15mm 17mm 5 = Bore in mm CAGE CODE MP - Machine Window-Type Brass TB - Phenolic / Bakelite CONTACT ANGLE B 40 C

5 miscellaneous Part Number Breakdown WC - Blank - Wide Cartridge (Wide Outer Race) Standard Width Outer Race Wide Width Seal WC87035 Cartridge Bearings Bore See Dimension Tables...pp See Table Series Series...p Wide Width Shield 8 - Wide Width Seal R4AZZ...p. 37 Radial Inch Dimensional Ball 4/16 Bore in 16th of an inch Blank ZZ 2RS Open Shielded Sealed Larger Cross Section RLS 8...pp RLS RMS - Light - Medium 8 = 1 Bore in 1/8 4

6 1200 Series Self-Aligning Load Rating (Lbs.) Part Number Dimensions (mm) Dynamic Static Cylindrical Bore Tapered Bore d D B Cr Cor Limiting Speed (RPM) Grease Oil K K K K K K K K K K K K K K K K K

7 1300 Series Self-Aligning Load Rating (Lbs.) Part Number Dimensions (mm) Dynamic Static Cylindrical Bore Tapered Bore d D B Cr Cor Limiting Speed (RPM) Grease Oil K K K K K K K K K K K K

8 1600 Series inch Bearing Size Load Rating (Lbs.) Limiting Speed (RPM) Dimensions (mm) Dynamic Static Grease Oil d D B Cr Cor 2RS ZZ/OPEN OPEN /16 11/16 1/ /4 11/16 1/ /16 7/8 9/ /8 7/8 9/ /16 29/32 5/ /8 29/32 5/ /16 29/32 5/ /8 1 1/8 3/ /16 1 1/8 3/ /2 1 1/8 3/ /16 1 3/8 7/ /2 1 3/8 7/ /16 1 3/8 7/ /8 1 3/8 7/ /8 1 5/8 1/ /4 1 5/8 1/ /8 1 3/4 1/ /4 1 3/4 1/ /4 2 9/ /8 2 9/ / /8 2 1/2 5/ /4 2 1/2 5/ /4 2 9/16 11/ /16 2 9/16 11/

9 2200 Series Self-Aligning Part Number Dimensions (mm) Load Rating (Lbs.) Limiting Speed (RPM) Cylindrical Bore Tapered Bore d D B Dynamic Static Grease Oil Cr Cor OPEN 2RS OPEN K K K K K K K K K K K K

10 2300 Series Self Aligning Part Number Dimensions (mm) Load Rating (Lbs.) Limiting Speed (RPM) Cylindrical Bore Tapered Bore d D B Dynamic Static Grease Oil Cr Cor OPEN 2RS OPEN K K K K K K K K K K K K K

11 5200 Series Bearing Size Load Rating (Lbs.) Dimensions Dynamic Static d (mm) D (mm) B (inches) Cr Cor Limiting Speed (RPM) 2RS ZZ/OPEN / / / / / / / / / / / / / / / / / / /

12 5300 Series Bearing Size Load Rating (Lbs.) Dimensions Dynamic Static d (mm) D (mm) B (inches) Cr Cor Limiting Speed (RPM) 2RS ZZ/OPEN / / / / / / / / / / / / /

13 600 Series Bearing Size d Dimensions (mm) Load Rating (Lbs.) Limiting Speed (RPM) D Open B Dynamic Static Grease Oil Sealed/ Shielded Cr Cor 2RS ZZ/OPEN OPEN / / /

14 6000 Series Load Rating (Lbs.) Limiting Speed (RPM) Dimensions (mm) Dynamic Static Grease Oil Bearing Size d D B Cr Cor 2RS ZZ/OPEN OPEN

15 6200 Series Bearing Size Load Rating (Lbs.) Limiting Speed (RPM) Dimensions (mm) Dynamic Static Grease Oil d D B Cr Cor 2RS ZZ/OPEN OPEN

16 6300 Series Bearing Size Load Rating (Lbs.) Limiting Speed (RPM) Dimensions (mm) Dynamic Static Grease Oil d D B Cr Cor 2RS ZZ/OPEN OPEN

17 6400 Series Bearing Size Load Rating (Lbs.) Limiting Speed (RPM) Dimensions (mm) Dynamic Static Grease Oil d D B Cr Cor 2RS ZZ/OPEN OPEN

18 6800 Series Load Rating (Lbs.) Limiting Speed (RPM) Dimensions (mm) Dynamic Static Grease Oil Bearing Size d D B Cr Cor 2RS ZZ/OPEN OPEN

19 6900 Series Bearing Size Load Rating (Lbs.) Limiting Speed (RPM) Dimensions (mm) Dynamic Static Grease Oil d D B Cr Cor 2RS ZZ/OPEN OPEN

20 M6200 Series Max Type Bearing Size Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B Cr Cor Limiting Speed (RPM) OPEN ZZ M M M M M M M M M M M M M M M

21 M6300 Series Max Type Bearing Size Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B Cr Cor Limiting Speed (RPM) OPEN ZZ M M M M M M M M M M M M M M

22 7200 Series Angular Contact Contact Angle (a) the angle between the radial plane and a line joining the two contact points of the inner and outer race. Angular contact bearings have races with high shoulders allowing the balls to operate at higher contact angles giving them increased one directional thrust capacity over the same size conrad style (deep groove) bearing. Greater clearances between the balls and the raceways allows for higher contact angles. Standard contact angles: B 40 C 15 Load Rating (Lbs.) Limiting Speed (RPM) Dimensions (mm) Dynamic Static Bearing Size d D B Cr Cor Grease Oil 7200 B B B B B B B B B B B B B B B B B B B B B B B B B B B B = 40 contact angle 21

23 7200 Series Duplex Bearing Size Duplex Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B1 Cr Cor Duplex Limiting Speed (RPM) Grease Oil 7200 BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA B = 40 contact angle UA* = Flush ground for slight axial end play UO = Flush ground for no end play * Usually supplied UA. Usually supplied with MP bronze cage. 22

24 7300 Series Angular Contact Contact Angle (a) the angle between the radial plane and a line joining the two contact points of the inner and outer race. Angular contact bearings have races with high shoulders allowing the balls to operate at higher contact angles giving them increased one directional thrust capacity over the same size conrad style (deep groove) bearing. Greater clearances between the balls and the raceways allows for higher contact angles. Standard contact angles: B 40 C 15 Bearing Size Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B Cr Cor Limiting Speed (RPM) Grease Oil 7301 B B B B B B B B B B B B B B B B B B B B B B B = 40 contact angle 23

25 7300 Series Duplex Bearing Size Duplex Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B1 Cr Cor Duplex Limiting Speed (RPM) Grease Oil 7301 BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA BUA B = 40 contact angle UA* = Flush ground for slight axial end play UO = Flush ground for no end play * Usually supplied UA. Usually supplied with MP bronze cage. 24

26 7000 Series Spindle Bearings Bearing Size Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B Cr Cor Limiting Speeds (RPM) Grease Oil 7004 CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL

27 7000 Series Spindle Bearing Pairs Bearing Size Duplex Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B Cr Cor Duplex Limiting Speeds (RPM) Grease Oil 7004 CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL

28 7200 Series Spindle Bearings Bearing Size Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B Cr Cor Limiting Speeds (RPM) Grease Oil 7204 CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL

29 7200 Series Spindle Bearing Pairs Bearing Size Duplex Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B Cr Cor Duplex Limiting Speeds (RPM) Grease Oil 7204 CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL

30 7900 Series Spindle Bearings Bearing Size Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B Cr Cor Limiting Speeds (RPM) Grease Oil 7905 CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL CT.P4.UL

31 7900 Series Spindle Bearing Pairs Bearing Size Duplex Load Rating (Lbs.) Dimensions (mm) Dynamic Static d D B Cr Cor Duplex Limiting Speeds (RPM) Grease Oil 7905 CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL CTBP4DUL

32 87000 Series Bearing Size Dimensions (mm) Dimensions (inches) Load Rating (Lbs.) d D B1 B2 Dynamic Cr Static Cor mm inch mm inch B outer inner Cr Cor Limiting Speed (RPM) Grease

33 88000 Series Bearing Size Dimensions (mm) Dimensions (inch) Load Rating (Lbs.) d D B1 B2 Dynamic Static mm inch mm inch outer inner Cr Cor Limiting Speed (RPM) Grease

34 WC87000 Series Bearing Size Dimensions (mm) Dimensions (inch) Load Rating (Lbs.) d D B1 B2 Dynamic Static mm inch mm inch outer inner Cr Cor Limiting Speed (RPM) Grease WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC

35 WC88000 Series Bearing Size Dimensions (mm) Dimensions (inch) Load Rating (Lbs.) d D B1 B2 Dynamic Static mm inch mm inch outer inner Cr Cor Limiting Speed (RPM) Grease WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC WC

36 R Series - inch B Load Rating (Lbs.) Limiting Speed (RPM) Bearing Size d D Open (Inch) Sealed / Shielded (Inch) Dynamic Static Grease Oil Cr Cor 2RS ZZ/OPEN OPEN R2 1/8 3/ R2A 1/8 1/ R3 3/16 1/ R3A 3/16 1/ R4 1/4 5/ R4A 1/4 3/ R6 3/8 7/ R8 1/2 1 1/ R10 5/8 1 3/ R12 3/4 1 5/ R14 7/8 1 7/ R R18 1 1/8 2 1/ R20 1 1/4 2 1/ R22 1 3/8 2 1/ R24 1 1/2 2 5/

37 RLS Series - inch Dimensions (inch) Dynamic Load Rating (Lbs.) Static Limiting Speed (RPM) Bearing Size d D B Cr Cor OPEN RLS4 1/2 1 5/16 3/ RLS5 5/8 1 9/16 7/ RLS6 3/4 1 7/8 9/ RLS7 7/8 2 9/ RLS /4 3/ RLS9 1 1/8 2 1/2 3/ RLS10 1 1/4 2 3/4 11/ RLS11 1 3/8 3 11/ RLS12 1 1/2 3 1/4 3/ RLS13 1 5/8 3 1/2 3/ RLS14 1 3/4 3 3/4 13/ RLS / RLS18 2 1/4 4 1/2 7/ RLS20 2 1/2 5 15/ RLS22 2 3/4 5 1/4 15/ RLS /4 1 1/ RLS26 3 1/ / RLS28 3 1/2 6 1/2 1 1/ RLS30 3 3/4 6 3/4 1 1/ RLS /4 1 1/ RLS34 4 1/4 7 1/2 1 1/ RLS36 4 1/ / RLS38 4 3/4 8 1/4 1 5/ RLS / RLS44 5 1/2 9 1/2 1 3/ RLS /2 1 9/ RLS52 6 1/ /

38 RMS Series - inch Bearing Size Load Rating (Lbs.) Dimensions (inch) Dynamic Static d D B Cr Cor Limiting Speed (RPM) OPEN RMS4 1/2 1 5/8 5/ RMS5 5/8 1 13/16 5/ RMS6 3/4 2 11/ RMS7 7/8 2 1/4 11/ RMS /2 3/ RMS9 1 1/8 2 13/16 13/ RMS10 1 1/4 3 1/8 7/ RMS11 1 3/8 3 1/2 7/ RMS12 1 1/2 3 3/4 15/ RMS13 1 5/8 4 15/ RMS14 1 3/4 4 1/4 1 1/ RMS15 1 7/8 4 1/2 1 1/ RMS /2 1 1/ RMS18 2 1/ / RMS20 2 1/2 5 1/2 1 1/ RMS22 2 3/4 6 1/4 1 3/ RMS / RMS26 3 1/4 7 1/2 1 9/ RMS27 3 3/8 7 1/2 1 9/ RMS28 3 1/2 8 1/8 1 3/ RMS30 3 3/4 8 1/4 1 3/ RMS /2 1 3/ RMS34 4 1/4 8 3/4 1 3/ RMS36 4 1/2 9 3/

39 Engineering Section Snap Ring & Groove Dimensions t d x A a b s Basic Bearing Dimensions of Ring, Groove and Housing Groove Ring Counter-bore a b s d t x inch mm inch mm +/ / Minimum max min max min max min max min inch mm inch mm inch mm inch mm

40 Engineering Section Snap Ring & Groove Dimensions t d x A a b s Basic Bearing Dimensions of Ring, Groove and Housing Groove Ring Counter-bore a b s d t x inch mm inch mm +/ / Minimum max min max min max min max min inch mm inch mm inch mm inch mm

41 Engineering Section Snap Ring & Groove Dimensions t d x A a b s Basic Bearing Dimensions of Ring, Groove and Housing Groove Ring Counter-bore a b s d t x inch mm inch mm +/ / Minimum max min max min max min max min inch mm inch mm inch mm inch mm

42 Engineering Section Radial Internal Clearance Radial Internal Clearance is the average of the radial distances through which one of the rings (of a non-preloaded bearing) may be displaced relative to the other. Tolerances for Single-Row Ball Bearings Listed in ten-thousandths inches (.0001 ) and micrometers (µm). Nominal Bore Diameter Sizes C2 C0 C3 C4 Over Including in µm in µm in µm in µm inch metric mm in mm in sizes sizes min max min max min max min max min max µm µm in in µm µm R2-R R8-R R12-R R16-R R

43 Engineering Section General Bearing Installation Shaft Condition Check shaft total indicated run-out (TIR), dimension of the bearing fit and the condition of the bearing mounting surface and shaft shoulder. The TIR should be less than [0.025mm] at the journals with the shaft running in its shaft centers or on roller steady rests in a lathe. The shaft journal diameter is critical due to its effect on the internal clearances of the bearing. With inner ring rotation (motors, pumps, etc.) there is an interference fit between the shaft journal and bearing inner ring that will cause the inner ring to expand when it is installed on the shaft. It is important to have shaft journals that are within the tolerances specified by the equipment manufacturer. A fit that is too loose or tight will make a big difference in bearing life. If shaft fits aren t available from the equipment manufacturer, use the chart on page 44 to determine the proper shaft fit for your application. Cleanliness Any foreign material that gets into the bearing will result in damage to the rolling elements and rings and a shortened bearing life. Bearings should never be removed from their original packaging until ready for use. They should be handled as little as possible, and should be kept away from dirty areas. Inspect the bearings being used for correct bearing number, damage, rust stains, or metal debris prior to installation. Proper Heating Heating is by far the best method for proper bearing installation. Heating must be done evenly, using an induction heater, oven, or some other device for heating the bearing evenly without damage. Flame heating should never be done because it generates localized temperatures that permanently affect the metallurgical properties of the bearing. The proper temperature for heating a bearing is between 65 C 120 C (150 F 250 F). Under no circumstances should the high temperature limit be exceeded. We typically recommend 104 C (220 F) as a target temperature. Measure the temperature on the inner ring using a calibrated temperature stick, or thermocouple. After proper heating, the installation should be executed crisply. The inner ring temperature lowers very quickly once it contacts the shaft. Once the bearing is on the shaft, hold it at the inner rings against the shaft shoulder for about 30 seconds or until the inner ring has cooled and shrunk. (This prevents it from moving away from the shaft shoulder while it is still hot. 42

44 Orientation of Angular Contact Pairs Engineering Section Angular Contact Installation Angular contact thrust bearings typically have a contact angle of between 15 and 40 degrees. The contact angle is determined by the looseness in the bearing. A looser fit between the ball and raceways allows the ball to run farther up on the shoulder, which increases the contact angle. A n D B1 n d Angular contact thrust bearings can be paired together in three arrangements: tandem, face-to-face or back-to-back. The tandem arrangement increases the thrust capacity in one direction but has no provision for thrust in the opposite direction. Back-to-back or face-toface pairing of two angular contact bearings provides bi-directional thrust capability. The back-to-back arrangement is the most common configuration. A A n D Back-to-Back B1 n d While both arrangements give equal thrust capacity, the back-to-back arrangement gives more shaft rigidity and the face-to-face arrangement gives more shaft flexibility. If possible, install the bearings together, sliding them onto the shaft until they seat against the shaft shoulder. If properly heated, the bearings will slide easily. If the bearings are too large to safely handle as a pair, install them one at a time, seating the first bearing against the shaft shoulder, and the second bearing against the first bearing. A A n D Face-to-Face B1 n d A Tandem 43

45 Engineering Section Angular Contact Installation Proper Tightening Note: Ring length tolerances can be held so that when the bearings are clamped together, slight axial play exists. For most applications this is desirable (UA suffix). For some applications, no axial play is desirable (UO suffix). For applications where extreme shaft rigidity is desired, ring lengths that preload the assembly can be used. Tighten the locknut hand-tight. In order to protect the key of the washer from shearing, the lockwasher should not be used at this time. Make sure that the tapered O.D. portion of the locknut is toward the bearing. This keeps any deformation of the slots away from the bearing (deformation of the slots due to improper installation of the locknut can cause the bearing s ring to become cocked on the shaft). Once the locknut is hand-tight, wait about a minute for the shaft to pick up heat from the bearing; then, using a spanner wrench and hammer, drive the locknut tight. Tight is defined as a distinct feel that the inner rings of the bearing are seated together and the locknut will start to distort if driven tighter. Wait about 10 minutes and re-tighten a second time. While the bearings are cooling, use clean lint-free rags, or oil paper, to cover and protect the bearings from foreign matter contamination. Note: Use of steel or brass drifts can cause metal flakes to be dislodged and enter the bearing. Steel or brass drifts may also lead to further deformation of the slots, which can lead to a cocked/tilted rings. Use of a proper spanner wrench is strongly recommended. To check installation, after bearings and shaft are cooled, remove the locknut. Spin the outer rings of the bearing. Try to rotate one outer ring CW while trying to rotate the other outer ring CCW. This should be difficult with a normal clearance (UA suffix) designation and not possible with a preloaded bearing. Depending on the preload, the bearings should now turn, in the same direction, freely, or with slight resistance. The resistance to turning the bearing should be consistent through 360 degrees of rotation. Inconsistent resistance to rotation is an indication of an incorrectly mounted bearing, or a sign of foreign material in the bearing. If you can not get the bearings to spin with consistent resistance, remove the bearings to investigate. Do not proceed! If a bearing must be removed from the shaft, it is generally best to replace it. Whenever a bearing is removed from the shaft, there is a risk of damage to the rolling elements and rings. The cost of a new bearing is a fraction of the cost of a pump or motor that goes out of service prematurely. If the installed bearings spin properly, install a new locknut and lock-washer and tighten. Then bend a tang on the lockwasher into one of the notches on the OD of the locknut. With cleanliness in mind, hand pack the bearings with appropriate grease if it is grease lubricated (20-30% fill is typically recommended). If it is oil lubricated, oil the bearing down with the correct clean oil. Install the housings, covers, seals and slingers to complete rotating element assembly and protect the bearing. 44

46 Engineering Section Angular Contact Pairs End Play End Play Requirements Axis 7000 angular contact ball bearings are built to take one directional thrust loading when individually mounted. Additional one directional capacity or the ability to take reversing thrust loads can be accomplished by duplexing the bearings (see page 39). Duplexing requires a controlled relationship between the axial location of the inner and outer ring faces. This process is known as flush grinding. The suffix UA is used to describe bearings that will have slight axial clearance when the bearings are used in any of the 3 duplex mounting configurations. See chart on this page for the amount of unmounted axial clearance. The U stands for U niversal mounting meaning that these are flush ground to give this axial clearance in any of the 3 mounting configurations. The A stands for slight A xial end play. Bearings with a U0 suffix will have zero end play when duplexed. Preloaded pairs can also be supplied. Make sure after assembly that your equipment does not have more play than the Max and / or less play then the minimum. Either of these conditions is due to a looseness or tightness in the fitting of the bearings. Bore-Over Bore-Incl. Min. end play.0001 Max end play

47 Preloaded Spindle Sets Axis spindle pairs are produced with a specific preload when clamped together. The relationship of the inner and outer ring face widths is controlled to cause an elastic deformation to occur when this clamping takes place. This eliminates shaft deflection. These preloads are small in comparison to the capacity of the bearing pair. The preloads are found in this chart. The light preload is standard, although medium and heavy preload are available upon request. Amount of preload in newtons for spindle pairs (Back to Back) Preload offset (Before clamping inners) Size Light (DUL) Medium (DUM) Heavy (DUH) 7000C C C C C C C C C C C C C C C C C C C C C C

48 Engineering Section Introduction to Shaft and Housing Fits Tolerance Classifications CLASS 0 Dmp F7 G7 H6 H7 H8 J6 J7 K6 HOUSING K7 M6 M7 N6 N7 P6 P7 CLEARANCE FIT TRANSITION FIT INTERFERENCE FIT TRANSITION FIT INTERFERENCE FIT r6 r7 CLASS 0 d mp g5 g6 h5 h6 j5 j6 k5 m5 m6 k6 SHAFTS n5 n6 p6 DMP Outer Ring O.D. Tolerance Range dmp Inner Ring Bore Tolerance Range Clearance Fit A fit that always enables a clearance between the bearing bore and shaft; or bearing outer ring and housing. Transition Fit A fit where both clearance or interference may occur depending on the actual sizes of the bearing bore and shaft; or bearing outer ring and housing. Interference Fit This fit always ensures some interference between the bearing bore and the shaft; or bearing outer ring and housing. Shaft Fits The table on page 44 outlines an approach to shaft fit selection based on factors such as load conditions, rotational conditions, and bearing size. Note that for general applications involving inner ring rotation and a constant radial load, an interference fit is recommended. The interference should be greater for heavier loads. For stationary shaft conditions, where the direction of radial load is constant, a moderate clearance fit is acceptable. The tables on page 46 & 47 contain numerical values for the various tolerance classifications. Housing Fits The table on page 45 outlines an approach to housing fit selection. Note that the use of clearance or interference fits is primarily based upon which bearing ring rotates in relation to the radial load. The extent of the radial load also influences the choice of fit. For indeterminate or varying load directions, clearance fits should be avoided. Clearance fits should be chosen for axially split housings to avoid distorting bearing outer rings. The tables on page 48 & 49 contain numerical values for the various tolerance classifications. 47

49 ENGINEERING SECTION Shaft Fits for Radial Bearings The ISO Shaft Tolerances listed are shown in the tables on pages 50 & 51 Conditions Examples of Application Shaft Diameter, MM Ball Bearings Shaft Fit Remarks Rotating Inner Ring or Indeterminate Direction Load* Light and variable loads (P 0.06C) Conveyors, light loaded gearbox bearings, electrical appliances, machine tools, pumps, blowers, etc. (18) to 100 j6 For high precision applications use j5 and k5. (100) to 140 k6 Normal and heavy loads (P>0.06C) General bearing applications, electric motors, turbines, pumps, internal combustion engines, gearing, woodworking machines etc. 18 (18) to100 j5 k5(k6) The tolerances in brackets are generally used for single-row angular contact ball bearings. May (100) to 140 m5(m6) also be used for other bearing types where speeds are moderate (140) to 200 m6 and the effect on internal clearance variation due to fit need not (200) to 280 n6 be considered. High demands on running accuracy with light loads (P 0.06C) Machine Tools 18 h5 The tolerances listed are not applicable to high precision (18) to100 j5 bearings. (100) to 200 k5 Stationary Inner Ring Easy axial displacement of inner ring on shaft desirable Stationary shaft wheels g6 For high precision applications use g5 Easy axial displacement of inner ring on shaft unnecessary Thrust Loads Only Bearing Applications of all kinds Tension pulleys, rope sheaves etc. h6 For high precision applications use h5 j6 *Variable external loads, shock loads, and vibratory and unbalanced loads in high-speed machinery cannot be accurately described and are classified as indeterminate direction load 48

50 ENGINEERING SECTION Housing Fits for Radial Bearings The ISO Housing Tolerances listed are shown in the tables on pages 52 & 53 Conditions Examples of Application Tolerance Displacement of Outer Ring Rotating Inner Ring Loads of all kinds General bearing applications, railroad axle bearing H6¹ Can be displaced Light and normal loads (P 0.12C) with simple working conditions General bearing applications, gear transmission H8 Can be displaced Heat conduction through shaft Drying cylinders G7² Can be displaced Indeterminate Direction Load* Light and normal loads (P 0.12C) axial displacement of outer ring desirable Electric motors, pumps, crankshaft bearings J7 Can usually be displaced Heavy shock loads Traction motors M7 Cannot be displaced Normal and heavy loads (P> 0.06C). Axial displacement of outer ring unnecessary Electrical motors, pumps, crankshaft bearings K7 Cannot usually be displaced Stationary Inner Ring Normal and heavy loads (P> 0.06C) Ball bearing wheel hubs, big end bearings. N7 Cannot be displaced Light and variable loads (P 0.06C) Conveyor rollers, pulleys, tension pulleys M7 Cannot be displaced Accurate or Quiet Running³ Light Loads Small electric motors J6² Can be displaced *Variable external loads, shock loads, and vibratory and unbalanced loads in high-speed machinery cannot be accurately described and are classified as indeterminate direction load ¹For large bearings (D > 250mm) and temperature difference between outer ring and housing > 10 C, use G7. ²For large bearings (D > 250mm) and temperature difference between outer ring and housing > 10 C, use F7. ³Not applicable to high precision bearings 49

51 Engineering Section Shaft Fits Nominal Bore Bore g6 h6 h5 j5 j6 k5 mm high low high low high low high low high low high low high low ,

52 Engineering Section Shaft Fits k6 m5 m6 n6 p6 r6 r7 high low high low high low high low high low high low high low :

53 Engineering Section Housing Fits Nominal Housing Bore Housing Bore F7 G7 H8 H7 H6 J6 J7 mm High Low High Low High Low High Low High Low High Low High Low High Low

54 Engineering Section Housing Fits K6 K7 M6 M7 N6 N7 P6 P7 High Low High Low High Low High Low High Low High Low High Low High Low

55 Engineering Section Bearing Troubleshooting Trouble Observed Characteristic Probable Causes Corrective Action Excessive axial load Correct outer ring fit in housing and/or shoulder location to allow thermal expansion. Look to reduce axial loading. High pitch, steady tone Excessive radial load Use correct fit of inner ring on shaft. For radial bearings, use bearing with greater internal clearance. For preloaded paired bearings, use lighter preload. Look to reduce axial loading. Misalignment Correct alignment Too much clearance in bearing Use correct shaft fit. For radial bearings use bearing with less internal clearance. For preloaded paired bearings, use heavier preload NOISE Low pitch continouous or intermittent Bearing brinelled (indents in bearing) Raceways pitted due to dirt Resonant vibration of machine structure Replace bearing, avoid brinelling. Wash all parts, replace with new bearing, use clean lubricant, improve sealing. Stiffen or sound-deaden thin panels and large flat surfaces. Intermittent squeal or high pitch noise Ball skidding Provide thrust preload spring. Use thinner grease. For radial bearings, use bearing with less internal clearance. For preloaded paired bearings, check for correct preload. Shaft rubbing housing Correct machine fits. Eliminate looseness. Intermittent rumbles, rattles clicks, etc. To much clearance in bearing Dirt in bearing Correct shaft fit. For radial bearings use adjusting spring or bearing with less internal clearance. For preloaded paired bearings, check for correct preload. Wash all parts, replace with new bearing, use clean lubricant, improve sealing. Loose machine parts Tighten all fans, pulleys, closures, spacers, slingers etc. High after first start Grease redistribution Allow machine to cool. Restart slowly if possible. Churing of lubricant Use lower oil level; less grease; stiffer grease No lubricant Add lubricant. TEMPERATURE Continuously high during operation Excessive axial load Excessive radial load Check outer ring fit in housing and/or shoulder location to allow thermal expansion. Use correct fit of inner ring on shaft. For radial bearings, use bearing with greater internal clearance. For preloaded paired bearings, use lighter preload. Look to reduce loading. Bearing misalignment Correct machine parts and alignment procedures. Excessive seal drag Use different type of seal or shield. 54

56 Engineering Section Bearing Troubleshooting Trouble Observed Characteristic Probable Cause Corrective Action During acceleration or deceleration periods Critical speeds of machine components Stiffen shaft or other machine components to avoid critical speeds. Unbalanced rotating parts Dynamically balance rotating parts. EXCESSIVE VIBRATION During operation at fixed speeds Shaft bent Cams, gears, linkage looseness Straighten and re-balance, or replace shaft. Adjust, improve or redesign. Misalignment Correct machine parts and alignment procedures. Bearing brinelling Replace bearing, avoid brinelling. Shaft bent Straighten and re-balance, or replace shaft. Bearing misalignment Correct machine parts and alignment procedures. RUNOUT Shaft does not run true. Shaft binds when rotated by hand. Bearing rings out of square Dirt Check squareness of shaft and housing shoulders, spacers and flingers. Remove any burrs. Wash all parts, replace with new bearing if necessary, use clean lubricant, improve sealing. Machine Deflection Stiffen machine members. Housing fit too loose Use recommended housing fit. OUTER RING WEARS LOOSE IN HOUSING Wear in housing bore Unbalanced forces Poor finish Dynamically balance rotating parts. Clamp outer ring faces. Use cylindrical roller bearing and press fit outer and inner rings. Use tighter fits on housing to prevent wear. Bore or grind housing I.D. oversize, press in a bushing and finish bore or grind to size. Soft housing material Use steel liners. Work-harden bore. 55

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58 Contents Introduction Part Number Breakdown Series Self-Aligning Series Self-Aligning Series inch Series Self-Aligning Series Self Aligning Series Series Series Series Series Series Series Series Series M6200 Series Max Type M6300 Series Max Type Series Angular Contact Series Duplex Series Angular Contact Series Duplex Series Spindle Bearings Series Spindle Bearing Pairs Series Spindle Bearings Series Spindle Bearing Pairs Series Spindle Bearings Series Spindle Bearing Pairs Series Series WC87000 Series WC88000 Series R Series - inch RLS Series - inch RMS Series - inch Snap Ring & Groove Dimensions Radial Internal Clearance

59 General Bearing Installation Angular Contact Installation Angular Contact Pairs End Play Preloaded Spindle Sets Introduction to Shaft and Housing Fits Shaft Fits for Radial Bearings Housing Fits for Radial Bearings Shaft Fits Housing Fits Bearing Troubleshooting

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