Operating conditions. Surface roughness R a R max

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Merkel U-Ring NI 300 Merkel U-Ring NI 300 Asymmetrical sealing lips PUR profile ring Sealing edge Material Material Code Hardness Polyurethane 94 AU 925 94 Shore A Operating conditions Material 94 AU 925 Fig. 1 Merkel U-Ring NI 300 Product description Merkel U-ring with asymmetrical profile, inner lip set back, additional support edge and sealing edge as well as press fit at the outside diameter. Product advantages Single-acting rod seal for standardised housings, amongst others, according to ISO 5597 Very good static and dynamic tightness Additional sealing edge, prevents ingress of dirt to a large degree Recommended for use in combination with single-acting wipers. Temperature range in C Hydraulic oils HL, HLP 30 +110 HFA fluids +5 +50 HFB fluids +5 +50 HFC fluids 30 +40 HFD fluids Water +5 +40 HETG (rapeseed oil) 30 +60 HEES (synthetic ester) 30 +60 HEPG (glycol) 30 +40 Mineral greases 30 +110 Pressure p in MPa 40 Running speed v in m/s 0,5 Surface quality Surface roughness R a R max Sliding surface 0,05 0,3 µm 2,5 µm Groove base 1,6 µm 6,3 µm Groove flanks 3,0 µm 15,0 µm Percentage contact area M r >50% to max. 90% at cutting depth c = Rz/2 and reference line C ref = 0%. Application Earth moving equipment, support cylinders, cranes, presses.

Design notes Please observe our general design notes in Technical Manual. Gap dimension The decisive factor for the function of the seal is the largest gap dimension occurring during operation on the non-pressurised side of the seal. Technical Manual. Profile Max. permissible gap dimension 16 MPa 26 MPa 32 MPa 40 MPa 4,0 5,0 0,50 0,40 0,35 0,30 >5,0 7,5 0,55 0,45 0,40 0,35 >7,5 12,5 0,66 0,50 0,45 0,40 >12,5 0,60 0,55 0,50 0,45 Tolerance recommendation and dimension d2 The admissible gap width, tolerances, guide play and deflection of the guide under load are to be taken into account when designing D2. Technical Manual. Nominal d d D 4 260 f8 H11 Fitting & installation Careful fitting is a prerequisite for the correct function of the seal. Technical Manual.

Article list Rounded and free of burrs R 2 <0,2 + 0,2 L H Rounded and free of burrs R 1 0,4 20 D d C D 2 10 20 8 9 5 4 94 AU P00925 21258 B 12 20 5,5 6,3 4 3,5 ISO 94 AU P00925 337339 B 12 20 8 9 4 3,5 94 AU P00925 68421 B 12 22 7 8 5 4 ISO 94 AU P00925 337340 D 12 22 8 9 5 4 94 AU P00925 21261 B 14 22 5,5 6,3 4 3,5 ISO 94 AU P00925 435813 D 14 24 8 9 5 4 94 AU P00925 21263 B 15 25 8 9 5 4 94 AU P00925 21265 B 16 24 5,5 6,3 4 4 ISO 94 AU P00925 337342 B 16 26 8 9 5 4,5 94 AU P00925 18733 B 18 26 5,5 6,3 4 4 ISO 94 AU P00925 364610 B 18 26 8 9 4 4 94 AU P00925 81789 D 18 28 8 9 5 4,5 94 AU P00925 21266 B 20 28 5,5 6,3 4 4 ISO 94 AU P00925 337344 B 20 30 8 9 5 4,5 94 AU P00925 18735 B 20 30 10 11 5 4,5 94 AU P00925 21269 B 20 35 10 11 7,5 5,5 94 AU P00925 401667 D 22 30 5,5 6,3 4 4 ISO 94 AU P00925 429357 D 22 32 7 8 5 4,5 ISO 94 AU P00925 381991 D 22 32 8 9 5 4,5 94 AU P00925 21271 B 22 32 10 11 5 4,5 94 AU P00925 21272 B 22 35 10 11 6,5 5,5 94 AU P00925 401668 D 23 35 10 11 6 5 94 AU P00925 336462 D 25 33 5,5 6,3 4 4 W ISO 94 AU P00925 337346 B 25 35 8 9 5 4,5 94 AU P00925 21274 B 25 35 10 11 5 4,5 94 AU P00925 21275 B 25 40 10 11 7,5 5,5 94 AU P00925 18741 B 25 45 12 13 10 6 94 AU P00925 401770 D 26 36 10 11 5 4,5 94 AU P00925 370114 B 28 36 8 9 4 4 W 94 AU P00925 5148 B 28 38 7 8 5 4,5 94 AU P00925 319964 D 28 38 8 9 5 4,5 94 AU P00925 21280 B 28 38 10 11 5 4,5 94 AU P00925 21282 B 28 43 10 11 7,5 5,5 94 AU P00925 21285 D 30 38 6 7 4 4 W 94 AU P00925 429363 D

30 40 10 11 5 4,5 W 94 AU P00925 21286 B 30 45 10 11 7,5 5,5 94 AU P00925 21305 B 30 50 12 13 10 6 94 AU P00925 401781 D 32 40 5,5 6,3 4 4 W 94 AU P00925 406663 D 32 40 6,5 7,5 4 4 W 94 AU P00925 315748 B 32 40 8 9 4 4 W 94 AU P00925 429370 B 32 42 10 11 5 4,5 W 94 AU P00925 21306 B 32 45 10 11 6,5 5,5 94 AU P00925 401826 B 32 47 10 11 7,5 5,5 94 AU P00925 21307 B 35 43 6 7 4 4 W 94 AU P00925 429378 D 35 45 10 11 5 4,5 W 94 AU P00925 18756 B 35 50 10 11 7,5 5,5 94 AU P00925 18759 B 36 44 6 7 4 4 W 94 AU P00925 429359 D 36 46 7 8 5 4,5 W ISO 94 AU P00925 319965 B 36 46 10 11 5 4,5 W 94 AU P00925 21315 B 36 51 10 11 7,5 5,5 94 AU P00925 21317 B 36 56 12 13 10 6 94 AU P00925 21324 B 37 47 8 9 5 4,5 W 94 AU P00925 368268 B 37 47 10 11 5 4,5 W 94 AU P00925 375755 B 38 55 10 11 8,5 6 94 AU P00925 401832 D 40 48 8 9 4 4 H 94 AU P00925 429264 D 40 50 7 8 5 4,5 H ISO 94 AU P00925 319563 B 40 50 10 11 5 4,5 H 94 AU P00925 18760 B 40 55 10 11 7,5 5,5 94 AU P00925 21326 B 40 55 11,5 12,5 7,5 5,5 ISO 94 AU P00925 337351 D 40 60 12 13 10 6 94 AU P00925 21338 B 42 52 10 11 5 4,5 H 94 AU P00925 116182 B 43 53 10 11 5 4,5 H 94 AU P00925 413930 D 45 55 7 8 5 4,5 H ISO 94 AU P00925 429849 B 45 55 10 11 5 4,5 H 94 AU P00925 18763 B 45 60 10 11 7,5 5,5 94 AU P00925 18764 B 45 60 11,5 12,5 7,5 5,5 ISO 94 AU P00925 381990 D 45 65 12 13 10 6 94 AU P00925 21339 D 46 56 10 11 5 4,5 H 94 AU P00925 413959 D 50 58 8 9 4 4 H 94 AU P00925 429254 D 50 59 8 9 4,5 4,5 H 94 AU P00925 420826 B 50 60 10 11 5 4,5 H 94 AU P00925 18765 B 50 65 10 11 7,5 5,5 W 94 AU P00925 21344 B 50 65 11,5 12,5 7,5 5,5 W 94 AU P00925 457406 D 50 70 12 13 10 6 94 AU P00925 21349 B 52 62 10 11 5 4,5 H 94 AU P00925 112670 B 55 63 8 9 4 4 H 94 AU P00925 523147 D 55 65 8 9 5 4,5 H 94 AU P00925 384050 D 55 65 10 11 5 4,5 H 94 AU P00925 21357 B 55 65 12 13 5 4,5 H 94 AU P00925 21361 B 55 70 10 11 7,5 5,5 W 94 AU P00925 18766 B 55 70 12 13 7,5 5,5 W 94 AU P00925 21364 B 55 75 12 13 10 6 94 AU P00925 21365 D 56 66 10 11 5 4,5 H 94 AU P00925 21368 B

Rounded and free of burrs R 2 <0,2 + 0,2 L H Rounded and free of burrs R 1 0,4 20 D d C D 2 56 71 10 11 7,5 5,5 W 94 AU P00925 21374 B 56 76 12 13 10 6 94 AU P00925 21379 D 58 68 10 11 5 4,5 H 94 AU P00925 472965 D 60 70 10 11 5 4,5 H 94 AU P00925 18771 B 60 70 12 13 5 4,5 H 94 AU P00925 21386 B 60 75 10 11 7,5 5,5 W 94 AU P00925 21391 B 60 75 11,5 12,5 7,5 5,5 W 94 AU P00925 531745 D 60 75 12 13 7,5 5,5 W 94 AU P00925 21395 B 60 80 12 13 10 6 94 AU P00925 18772 B 63 73 12 13 5 4,5 H 94 AU P00925 21396 B 63 78 10 11 7,5 5,5 W 94 AU P00925 21406 B 63 83 12 13 10 6 94 AU P00925 21407 B 65 75 12 13 5 4,5 H 94 AU P00925 21420 B 65 80 12 13 7,5 5,5 W 94 AU P00925 21429 B 65 85 12 13 10 6 94 AU P00925 18773 B 68 78 12 13 5 4,5 H 94 AU P00925 380798 D 70 80 12 13 5 4,5 H 94 AU P00925 21430 B 70 85 10 11 7,5 5,5 W 94 AU P00925 18776 B 70 85 11,5 12,5 7,5 5,5 W ISO 94 AU P00925 319968 D 70 85 12 13 7,5 5,5 W 94 AU P00925 21438 B 70 90 12 13 10 6 94 AU P00925 18777 B 75 85 12 13 5 4,5 H 94 AU P00925 21440 B 75 90 10 11 7,5 5,5 W 94 AU P00925 21446 B 75 90 12 13 7,5 5,5 W 94 AU P00925 18779 B 77 87 12 13 5 4,5 H 94 AU P00925 369026 D 80 90 10 11 5 4,5 H 94 AU P00925 127310 D 80 90 12 13 5 4,5 H 94 AU P00925 21447 B 80 95 10 11 7,5 5,5 H 94 AU P00925 21454 B 80 95 12 13 7,5 5,5 H 94 AU P00925 21455 B 80 100 12 13 10 6 W 94 AU P00925 18781 B 80 100 15 16 10 6 W ISO 94 AU P00925 337358 D 85 95 12 13 5 4,5 H 94 AU P00925 432307 D 85 100 12 13 7,5 5,5 H 94 AU P00925 21466 B 85 105 12 13 10 6 W 94 AU P00925 21472 D 90 100 12 13 5 4,5 H 94 AU P00925 29310 D 90 105 11,5 12,5 7,5 5,5 H ISO 94 AU P00925 344874 D

90 105 12 13 7,5 5,5 H 94 AU P00925 21474 B 90 110 12 13 10 6 W 94 AU P00925 18786 B 95 110 12 13 7,5 5,5 H 94 AU P00925 335953 D 95 115 12 13 10 6 W 94 AU P00925 324248 B 100 115 12 13 7,5 5,5 H 94 AU P00925 21482 B 100 120 12 13 10 6 W 94 AU P00925 18789 B 100 120 15 16 10 6 W ISO 94 AU P00925 21483 B 100 125 15 16 12,5 6,5 W 94 AU P00925 401873 D 110 125 15 16 7,5 5,5 H 94 AU P00925 30970 B 110 130 12 13 10 6 W 94 AU P00925 21849 B 110 130 15 16 10 6 W ISO 94 AU P00925 21486 B 110 135 15 16 12,5 6,5 W 94 AU P00925 401889 D 115 140 15 16 12,5 6,5 W 94 AU P00925 407165 D 120 135 15 16 7,5 5,5 H 94 AU P00925 21493 B 120 140 12 13 10 6 W 94 AU P00925 21497 B 120 140 15 16 10 6 W 94 AU P00925 21500 B 125 145 12 13 10 6 H 94 AU P00925 21852 B 125 145 15 16 10 6 H ISO 94 AU P00925 21501 B 125 150 15 16 12,5 6,5 W 94 AU P00925 401892 D 125 155 18 19 15 7,5 W 94 AU P00925 21505 D 130 150 12 13 10 6 H 94 AU P00925 21511 B 130 150 15 16 10 6 H 94 AU P00925 21514 B 140 160 12 13 10 6 H 94 AU P00925 21516 B 140 160 15 16 10 6 H ISO 94 AU P00925 21518 B 140 165 15 16 12,5 6,5 W 94 AU P00925 401895 D 140 170 18 19 15 7,5 W 94 AU P00925 21520 D 150 170 15 16 10 6 H 94 AU P00925 18792 B 150 180 18 19 15 7,5 W 94 AU P00925 21522 D 160 180 15 16 10 6 H 94 AU P00925 21538 B 160 185 15 16 12,5 6,5 H ISO 94 AU P00925 401896 B 170 190 15 16 10 6 H 94 AU P00925 21561 B 180 200 15 16 10 6 H 94 AU P00925 18793 B 180 205 15 16 12,5 6,5 H ISO 94 AU P00925 401907 D 180 210 18 19 15 7,5 W 94 AU P00925 21569 D