member sizes 0-6 have male point in addition to length shown in the general dimensions on page 162

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1 Thread Plug Gages - Taperlock Features/Benefits: manufactured from select steel ground, accurately lapped, and meticulously inspected in every thread element standard in X tolerance optional color gage handles available upon request ideal to identify metric versus inch or master versus working gages shanks on gaging members are tapered to fit corresponding taper holes in the handles worn members may be removed and the handles salvaged for use with new members Taperlock Series No GO Member Series No NO GO Member Series No Double End with MACHINE SCREW member sizes 0-6 have male point in addition to length shown in the general dimensions on page GO Member 1551 NO GO Member 1520 Double End with Taperlock Thread Plug Size UNC UNF UNEF Classes 2B,3B Class 2B Class 3B Class 2B Class 3B / / / / / / / / / / / / / / / / / / / /16 0 Please use EDP numbers when ordering. Taperlock HSS thread gages are continued on the next page. General dimensions for taperlock thread gages are on page GO Member 1551 NO GO Member 1520 Double End with 145

2 Taperlock Thread Plug (continued) Taperlock Series No GO Member Series No NO GO Member Series No Double End with 1502 GO Member 1551 NO GO Member FRACTIONAL 1502 GO Member 1551 NO GO Member 1520 Double End with Size UNC UNF UNEF Classes 2B,3B Class 2B Class 3B Class 2B Class 3B 1/ /8 1 1/ /8 1 1/ /8 1 5/ /8 1 5/ /8 1 5/ /8 1 3/ /2 2 3/ /2 2 3/ /2 2 7/ /2 2 7/ /2 2 7/ /2 2 1/ /2 2 1/ /2 2 1/ /2 2 9/ /16 3 9/ /16 3 9/ /16 3 5/ /16 3 5/ /16 3 5/ /16 3 3/ /16 3 3/ /16 3 3/ /16 3 7/ /8 4 7/ /8 4 7/ / / / NS / / / / / / / / / / / / / / / / / s are not included with single members. If handles are required for GO or NO GO members, specify with handle. Chrome plating available as a stock modification Double End with 146

3 Thread Plug Gages HSS - TiN Coated Taperlock for Extended Gage Wear Life Features/Benefits: manufactured from select highspeed steel coated with TiN (titanium nitride) ground, accurately lapped, and meticulously inspected in every thread element standard in X tolerance optional color gage handles available upon request ideal to identify metric versus inch or master versus working gages shanks on gaging members are tapered to fit corresponding taper holes in the handles worn members may be removed and the handles salvaged for use with new members member sizes 0-6 have male point in addition to length shown in the general dimensions on page 162 TiN Coated Taperlock Series No GO Member Series No NO GO Member Series No Double End with MACHINE SCREW TiN coating provides added hardness and lubricity for: greatly increased gage life - up to 10 times more life than uncoated gages surface hardness greater than HSS of base gage increased corrosion and abrasion resistance due to inert, hard characteristics of TiN coating reduced material build-up due to added lubricity of coating 2526 GO Member 2551 NO GO Member 2520 Double End with TiN Coated Taperlock Thread Plug General dimensions for taperlock thread gages are on page GO Member 2551 NO GO Member 2520 Double End with Size UNC UNF Classes 2B,3B Class 2B Class 3B Class 2B Class 3B / / / / / / / / / / / / / / / /16 0 s are not included with single members. If handles are required for GO or NO GO members, specify with handle. TiN-coated taperlock thread plug gages are continued on the next page. 147

4 TiN Coated Taperlock Thread Plug (continued) TiN Coated Taperlock Series No GO Member Series No NO GO Member Series No Double End with FRACTIONAL 2526 GO Member 2551 NO GO Member 2520 Double End with 2526 GO Member 2551 NO GO Member 2520 Double End with Size UNC UNF Classes 2B,3B Class 2B Class 3B Class 2B Class 3B 1/ /8 1 1/ /8 1 5/ /8 1 5/ /8 1 3/ /2 2 3/ /2 2 7/ /2 2 7/ /2 2 1/ /2 2 1/ /2 2 9/ /16 3 9/ /16 3 5/ /16 3 5/ /16 3 3/ /16 3 3/ /16 3 s are not included with single members. If handles are required for GO or NO GO members, specify with handle. GAGING: TiN (Titanium Nitride) Coated Plug Gages When are TiN-coated gages recommended? 1. When the product material is abrasive (causing excessive wear on the gage), or in any highvolume application where there is continuous or frequent usage. The extra hard surface and lubricity of titanium nitride greatly extend the wear life, by as much as 10 times, permitting longer frequencies between recalibration. The gold color is a wear indicator. When the gold is worn off, the gage is undersized. 2. Due to its inert, hard characteristics, titanium nitride provides a high resistance to corrosion, making it ideal when humidity and other atmospheric conditions create corrosion problems. 3. When gaging, certain soft materials or plated product threads tend to "load up" on the flanks of steel gages. The lubricity properties of TiN greatly aid in preventing this buildup. When is TiN better than chrome? 1. TiN is harder than chrome; therefore, it is more wear resistant. 2. TiN provides better lubricity than chrome, cutting down wear and galling. 3. TiN is a more uniform coating than chrome, eliminating possible uneven buildup on the gage flanks. 4. TiN does not gall in aerospace-type materials. 5. TiN-coated gages outlast chrome gages by as much as 8 times. 148

5 Metric Taperlock Class 6H Series No GO Member Series No NO GO Member Series No Double End with Metric and Helical Coil Taperlock Thread Plug Size 1571 GO Member 1572 NO GO Member 1573 Double End with M2,5 x 0, / M3 x 0, /4 00 M3,5 x 0, /4 00 M4 x 0, /16 0 M5 x 0, /16 0 M6 x 1, /8 1 M8 x 1, /8 1 M10 x 1, /2 2 M10 x 1, /2 2 M12 x 1, /2 2 M12 x 1, /2 2 M14 x 1, /16 3 M14 x 2, /16 3 M16 x 1, /16 3 M16 x 2, /16 3 M18 x 1, /16 3 M20 x 2, /16 3 M20 x 1, /16 3 s are not included with single members. If handles are required for GO or NO GO members, specify with handle. Uncoated gages standard; chrome plating or TiN coating available as a stock modification. Reversible members can be ordered and are priced on application. Helical Coil Gages (STI) Taperlock Gages Series No GO Member Series No NO GO Member Series No Double End with 1571 GO Member 1572 NO GO Member 1573 Double End with 3502 GO Member 3551 NO GO Member 3520 Double End with 3502 GO Member 3551 NO GO Member 3520 Double End with Size UNC UNF Classes 2B,3B Class 3B Class 3B Class 2B Class 3B / / / / / /16 0 1/ /8 1 1/ /8 1 5/ /8 2 5/ /8 2 3/ /2 2 3/ /2 2 7/ /2 3 1/ /2 3 1/ /2 3 s are not included with single members. If handles are required for GO or NO GO members, specify with handle. Uncoated gages standard; chrome plated and TiN available as a stock modification. W tolerance available and priced on application. 149

6 Reversible Thread Plug Thread Plug Gages - Reversible Features/Benefits: manufactured from select highspeed steel made with the finest equipment available and meticulously inspected in every thread element standard in X tolerance reversible thread plug gages are straight and held to size over their entire length, which enables use of both ends worn end can be quickly reversed in the specially designed handle to put unused end into action, doubling gage life Reversible Series No GO Member Series No NO GO Member Series No Double End with reversible design enables repositioning in the handle to extend the effective length of the gage member for deeper hole gaging aluminum handles are made to American Gage design gaging members are securely held by bushings that compress when aluminum nuts are tightened General dimensions for reversible thread gages are on page GO Member 1559 NO GO Member 1529 Double End with MACHINE SCREW 1509 GO Member 1559 NO GO Member 1529 Double End with Size UNC UNF Class 2B, 3B Class 2B Class 3B /4 1W /4 1W /4 1W /8 2W /8 2W /8 2W /8 2W /8 2W /8 2W /8 2W /8 2W /8 2W /8 2W /8 2W /8 2W /16 3W /16 3W /16 3W /16 3W s are not included with single members. If handles are required for GO or NO GO members, specify with handle. Uncoated gages are standard; chrome plated gages are available as a stock modification. 3B NO GO gages are available and priced on application. Reversible thread plug gages continue on the next page. 150

7 (continued) Reversible Series No GO Member Series No NO GO Member Series No Double End with Reversible Thread Plug FRACTIONAL 1509 GO Member 1559 NO GO Member 1529 Double End with Size UNC UNF Class 2B, 3B Class 2B Class 3B 1/ /16 3W 1/ /16 3W 5/ /16 4W 5/ /16 4W 3/ /16 4W 3/ /16 4W 7/ /16 5W 7/ /16 5W 1/ /16 5W 1/ /16 5W 9/ /16 6W 9/ /16 6W 5/ /16 6W 5/ /16 6W 3/ /16 7W 3/ /16 7W s are not included with single members. If handles are required for GO or NO GO members, specify with handle. Uncoated gages are standard; chrome plated gages are available as a stock modification. 3B NO GO gages are available and priced on application. Greenfield Inch Screw Thread Manual This 52-page manual contains invaluable information on the Unified Screw Thread System, including functional tables, diagrams, and formulas for suggested tap and drill sizes, internal and external thread limits for threaded products, and thread limits for taps. Covering UNC-NC sizes 1-64 through 1-8 and UNF-NF sizes 0-80 through 1-12, this guide is a must for engineers, specifiers, and machinists involved in screw threading. Over 1,000,000 copies in print! GI039 Greenfield Metric Screw Thread Manual Totally revised to put more than 50 years of metric screw threading experience at your fingertips. This 36-page publication presents useful design, specification, and manufacturing information for the most commonly used ISO Metric Screw Threads. Easy-to-read diagrams and charts complement detailed descriptions, formulas, and recommendations to outline current internal and external limits for product threads, tools, and gages. Includes an expanded listing for both metric and decimal inch translations by tolerance class for allowance, major diameter, and minor diameter. GI040 Call your Greenfield Tap and Die distributor to order your copies today! 151

8 Truncated Thread Setting Plug Gages Features/Benefits: manufactured of select steel ground, accurately lapped, and meticulously inspected in every thread element class X tolerance on pitch diameter class W tolerance on lead and angles shanks of gaging members are tapered to fit tapered holes in the handle handle can be used with new gaging members when old members are worn sizes 0-6 members have male point in addition to length listed in general dimensions on page 165 Application Information: used for setting and evaluating adjustable thread ring gages truncated-type gages have a full form threaded portion and a truncated portion the full form portion checks pitch diameter and major diameter clearance the truncated portion checks pitch diameter and flank angle wear, assuring the proper setting and control of thread ring gages pitch diameter is constant over the full length of the gage Truncated Thread Setting Plug Gage - Class X Series No. 1556T - GO Member Series No. 1557T - NO GO Member Series No. 1527T - Double End with Truncated Thread Setting Plug MACHINE SCREW 1527T GO - NO GO Member 1556T GO Member 1557T NO GO Member with Size UNC UNF UNEF Class 2A Basic Class 2A Class 3A Class 2A Class 3A / / / / / / / / / / / / / / / / / / / /16 0 s are not included with single members. If handles are required for GO or NO GO members, specify with handle. W tolerance is available and priced on application. Thread setting plug gages are continued on the next page. 1527T GO - NO GO Member with 1556T GO Member 1557T NO GO Member General dimensions for truncated thread setting plug gages are on page

9 Truncated Thread Setting Plug (continued) Truncated Thread Setting Plug Gage Class X Series No. 1556T - GO Member Series No. 1557T - NO GO Member Series No. 1527T - Double End with FRACTIONAL 1527T GO - NO GO Member 1556T GO Member 1557T NO GO Member with Size UNC UNF UNEF Class 2A Basic Class 2A Class 3A Class 2A Class 3A 1/ /8 1 1/ /8 1 1/ /8 1 5/ /8 1 5/ /8 1 5/ /8 1 3/ /2 2 3/ /2 2 3/ /2 2 7/ /2 2 7/ /2 2 7/ /2 2 1/ /2 2 1/ /2 2 1/ /2 2 9/ /16 3 9/ /16 3 9/ /16 3 5/ /16 3 5/ /16 3 5/ /16 3 3/ /16 3 3/ /16 3 3/ /16 3 7/ /8 4 7/ /8 4 7/ / / / NS / / / / / / / / / / / / / / / / / s are not included with single members. If handles are required for GO or NO GO members, specify with handle. W tolerance is available and priced on application. 156

10 Metric Truncated Thread Setting Plug Gage - Taperlock - Class X (6g) Series No. 1576T - GO Member Series No. 1577T - NO GO Member Series No. 1578T - Double End with Truncated Thread Setting Plug METRIC Size 1576T GO Member 1577T NO GO Member 1578T Double End with M2,5 x 0, / M3 x 0, /4 00 M3,5 x 0, /4 00 M4 x 0, /16 0 M5 x 0, /16 0 M6 x 1, /8 1 M8 x 1, /8 1 M10 x 1, /2 2 M10 x 1, /2 2 M12 x 1, /2 2 M12 x 1, /2 2 M14 x 1, /16 3 M14 x 2, /16 3 M16 x 1, /16 3 M16 x 2, /16 3 M18 x 1, /16 3 M20 x 1, /16 3 M20 x 2, /16 3 s are not included with single members. If handles are required for GO or NO GO members, specify with handle. W tolerance available and priced on application. THREADING: H Limits vs. D Limits H limits are a sequence of numbers in.0005" increments larger than the minimum limit of the part, starting with H1. An H1 limit is one.0005" increment larger than the minimum limit or GO gage, an H2 is two.0005" increments (or.001) larger, an H3 is three.0005" increments (or.0015"), and so on. The recommended H limit for a particular size should be approximately 40% of the thread tolerance larger than the minimum limit of the thread. D limits are similar to H limits and follow the same numbering system. However, H limits are used primarily for inch threads, while D limits are used exclusively for metric threads. As is the case with H limits, D limits are a sequence of numbers in increments larger than the minimum limit or GO gage, but the increments are.013mm or.00051". Starting with D1, a D1 is one.013mm increment larger, a D2 is two.013mm (or.026mm) increments larger, and so forth. As with inch threads, the 40% rule is applied based upon the tolerance or class of thread. There are two primary differences between H limits and D limits. First, D limits are slightly larger than H limits. Second, the tap manufacturing tolerances are different. An H or D limit number defines the maximum size of the tap. A tap manufacturing tolerance is then applied to establish the minimum limit. For H limit taps, the tolerance is minus.0005" for all sizes through 1" diameter. Tap tolerances for D limits are larger for all thread sizes. The smallest tolerance is.015mm ( ) and becomes larger with the diameter. For example, an M3 has a.015mm (or.0006") tolerance, an M6 has a.020mm (or.00079") tolerance, and an M20 tap has a.041mm (or ) tolerance. That is over 3 times the amount of tolerance of an equivalent 3/4" tap. 157