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Technical Information Optional Neck and Shortened Thread Length Dimensions • Reference USCTI Table 302A Blank Design 1 Blank Design 3 Blank Design 2 „General Dimensions Tap Dimensions — Inches machine nominal nominal screw nominal metric blank shank diameter range size number fractional diameter design overall thread neck square diameter square (in) (in) diameter (in) mm (in) number length L length l length l1 length l2 D1 size A .104 .117 4 (.1120) — — 1 1.88 .31 .25 .19 .1410 .110 — .117 .130 5 (.1250) M3 (.1181) 1 1.94 .31 .31 .19 .1410 .110 .130 .145 6 (.1380) M3.5 (.1378) 1 2.00 .38 .31 .19 .1410 .110 — .145 .171 8 (.1640) M4 (.1575) 1 2.13 .38 .38 .25 .1680 .131 .171 .197 10 (.1900) M4.5 (.1772) 1 2.38 .50 .38 .25 .1940 .152 — M5 (.1969) — — — — — — — .197 .223 12 (.2160) — — — — 1 2.38 .50 .44 .28 .2200 .165 .223 .260 1/4 (.2500) M6 (.2362) 2 2.50 .63 .38 .31 .2550 .191 .260 .323 5/16 (.3125) M7, M8 (.2756), (.3150) 2 2.72 .69 .44 .38 .3180 .238 — .323 .395 3/8 (.3750) M10 (.3937) 2 2.94 .75 .50 .44 .3810 .286 .395 .448 7/16 (.4375) — — 3 3.16 .88 – .41 .3230 .242 — .448 .510 1/2 (.5000) M12 (.4724) 3 3.38 .94 – .44 .3670 .275 .510 .573 9/16 (.5625) M14 (.5541) 3 3.59 1.00 – .50 .4290 .322 — .573 .635 5/8 (.6250) M16 (.6299) 3 3.81 1.09 – .56 .4800 .360 .635 .709 11/16 (.6875) M18 (.7087) 3 4.03 1.09 – .63 .5420 .406 — .709 .760 3/4 (.7500) — — 3 4.25 1.22 – .69 .5900 .442 .760 .823 13/16 (.8125) M20 (.7874) 3 4.47 1.22 – .69 .6520 .489 — .823 .885 7/8 (.8750) M22 (.8661) 3 4.69 1.34 – .75 .3670 .523 .885 .948 15/16 (.9375) M24 (.9449) 3 4.91 1.34 – .75 .7600 .570 — .948 1.010 1 (1.0000) M25 (.9843) 3 5.13 1.50 – .81 .8000 .600 Reprinted with permission from United States Cutting Tool Institute (USCTI). Published by Kennametal Inc. © 2014. All rights reserved. NOTE: Thread length l is based on a length of 12 pitches of the UNC thread series. Thread length “l” is a minimum value and has no tolerance. When thread length “l” is added to neck length “l1”, the total shall be no less than the minimum USCTI Table 302 thread length “l”. Unless otherwise specified, all tolerances are in accordance with USCTI Table 302. For eccentricity tolerances, see USCTI Table 317. Table 302 is provided for reference only. WIDIA-GTD™ tap dimensions may differ. „Tolerances „Special Taps nominal diameter Unless otherwise specified: element range (in) direction tolerance (in) Special taps over 1.010–1.510" diameter inclusive, having 14 or more length overall — L .0520–1.0100 plus or minus .031 threads per inch or 1,75mm pitch and finer, and sizes over 1.510" 1.0100–4.0100 plus or minus .063 diameter with 10 or more threads per inch or 2,5mm pitch and finer, length of thread — l .0520–.2230 plus or minus .047 are made to general dimensions shown in USCTI Table 303. .2230–.5100 plus or minus .063 Special tap thread limits are determined using the formulas shown .5100–1.5100 plus or minus .094 in USCTI Table 331 for Unified Inch Screw Threads and USCTITable 341 for metric m-profile screw threads. 1.5100–4.0100 plus or minus .125 length of square — l2 .0520–1.0100 plus or minus .031 NOTE: 1.0100–4.0100 plus or minus .063 Tap sizes .395" and smaller have an external centre on the thread end(may be removed on bottoming taps). Sizes .125" and smaller have an diameter of shank — d1 .0520–.2230 minus .0015 external centre on the shank end. Sizes .224–.395" have truncated partial cone centres on the shank end (length of cone approximately 1/4 of .2230–.6350 minus .0015 diameter of shank). Sizes over .395" have internal centres on both the .6350–1.0100 minus .0020 thread and shank ends. 1.0100–1.5100 minus .0020 For standard thread limits and tolerances for Unified Inch Screw Threads, see 1.5100–2.0100 minus .0030 USCTI Table 327, and for metric threads, see USCTI Table 337. 2.0100–4.0100 minus .0030 For eccentricity tolerances of tap elements, see USCTI Table 317. size of square — a .0520–.5100 minus .004 .5100–1.0100 minus .006 1.0100–2.0100 minus .008 2.0100–4.0100 minus .010 Reprinted with permission from United States Cutting Tool Institute (USCTI). Published by Kennametal Inc. © 2014. All rights reserved. widia.com Y91 Technical Information