RECOMMENDED HOLE DIAMETERS FOR TAPS ISO METRIC THREADS M ISO Metric coarse thread DIN 13 Nom size D1 (6H) D P min max mm mm mm mm M 1,0 0,25 0,729 0,785 mm 0,75 1,1 0,25 0,829 1,2 0,25 0,929 1,4 0,30 1,075 1,6 0,35 1,221 1,7 0,35 1,321 1,8 0,35 1,421 2,0 0,40 1,567 2,2 0,42 1,713 2,3 0,40 1,867 2,5 0,45 2,013 2,6 0,45 2,113 3,0 0,50 2,459 3,5 0,60 2,850 4,0 0,70 3,242 4,5 0,75 3,688 5,0 0,80 4,134 5,5 0,90 4,526 6,0 1,00 4,917 7,0 1,00 5,917 8,0 1,25 6,647 9,0 1,25 7,647 10,0 1,50 8,367 11,0 1,50 9,376 12,0 1,75 10,106 14,0 2,00 11,835 16,0 2,00 13,835 18,0 2,50 15,294 20,0 2,50 17,294 22,0 2,50 19,294 24,0 3,00 20,752 27,0 3,00 23,752 30,0 3,50 26,211 33,0 3,50 29,211 36,0 4,00 31,670 39,0 4,00 34,670 42,0 4,50 37,129 45,0 4,50 40,129 48,0 5,00 42,587 52,0 5,00 46,587 56,0 5,50 50,046 60,0 5,50 54,046 64,0 6,00 57,505 68,0 6,00 61,505 0,885 0,985 1,142 1,321 1,421 1,521 1,679 1,838 1,979 2,138 2,238 2,599 3,010 3,422 3,878 4,334 4,750 5,153 6,153 6,912 7,912 8,676 9,676 10,441 12,210 14,210 15,744 17,744 19,744 21,252 24,252 26,771 29,771 32,270 35,270 37,799 40,799 43,297 47,297 50,796 54,796 58,305 62,305 0,85 0,95 1,10 1,25 1,35 1,45 1,60 1,75 1,90 2,05 2,15 2,50 2,90 3,30 3,70 4,20 4,60 5,00 6,00 6,80 7,80 8,50 9,50 10,20 12,00 14,00 15,50 17,50 19,50 21,00 24,00 26,50 29,50 32,00 35,00 37,50 40,50 43,00 47,00 50,50 54,50 58,00 62,00 MF ISO Metric fine thread DIN 13 Nom size D P D1 (6H) min max mm mm mm mm mm M 2,5 x 0,35 2,121 2,221 2,15 2,6 x 0,35 2,221 2,321 2,25 3 x 0,35 2,621 2,721 2,65 3,5 x 0,35 3,121 3,221 3,15 4 x 0,35 3,621 3,721 3,65 4 x 0,50 3,459 3,599 3,50 5 x 0,50 4,459 4,599 4,50 6 x 0,50 5,459 5,599 5,50 6 x 0,75 5,188 5,378 5,20 7 x 0,75 6,188 6,378 6,20 8 x 0,75 7,188 7,378 7,20 8 x 1,00 6,917 7,153 7,00 9 x 0,75 8,188 8,378 8,20 9 x 1,00 7,917 8,153 8,00 10 x 0,75 9,188 9,378 9,20 10 x 1,00 8,917 9,153 9,00 10 x 1,25 8,647 8,912 8,80 11 x 1,00 9,917 10,153 10,00 12 x 1,00 10,917 11,153 11,00 12 x 1,25 10,647 10,912 10,80 12 x 1,50 10,376 10,676 10,50 14 x 1,00 12,917 13,153 13,00 14 x 1,25 12,647 12,912 12,80 14 x 1,50 12,376 12,676 12,50 15 x 1,00 13,917 14,153 14,00 16 x 1,00 14,917 15,153 15,00 16 x 1,50 14,376 14,676 14,50 18 x 1,00 16,917 17,153 17,00 18 x 1,50 16,376 16,676 16,50 18 x 2,00 15,835 16,210 16,00 20 x 1,00 18,917 19,153 19,00 20 x 1,50 18,376 18,676 18,50 20 x 2,00 17,835 18,210 18,00 22 x 1,00 20,917 21,153 21,00 22 x 1,50 20,376 20,676 20,50 22 x 2,00 19,835 20,210 20,00 24 x 1,00 22,917 23,153 23,00 24 x 1,50 22,376 22,676 22,50 24 x 2,00 21,835 22,210 22,00 25 x 1,50 23,376 23,676 23,50 26 x 1,50 24,376 24,676 24,50 27 x 1,50 25,376 25,676 25,50 27 x 2,00 24,835 25,210 25,00 28 x 1,50 26,376 26,676 26,50 28 x 2,00 25,835 26,210 26,00 30 x 1,50 28,376 28,676 28,50 30 x 2,00 27,835 28,210 28,00 32 x 1,50 30,376 30,676 30,50 32 x 2,00 29,835 30,210 30,00 33 x 1,50 31,376 31,676 31,50 33 x 2,00 30,835 31,210 31,00 34 x 1,50 32,376 32,676 32,50 Nom size D P mm mm M 35 x 1,5 36 x 1,5 36 x 2,0 36 x 3,0 38 x 1,5 39 x 1,5 39 x 2,0 39 x 3,0 40 x 1,5 40 x 2,0 42 x 1,5 42 x 2,0 42 x 3,0 45 x 1,5 45 x 2,0 45 x 3,0 48 x 1,5 48 x 2,0 48 x 3,0 50 x 1,5 50 x 2,0 52 x 1,5 52 x 2,0 52 x 3,0 56 x 3,0 56 x 4,0 60 x 4,0 64 x 3,0 64 x 4,0 68 x 4,0 70 x 3,0 70 x 4,0 72 x 3,0 72 x 4,0 72 x 6,0 76 x 3,0 76 x 4,0 76 x 6,0 80 x 4,0 80 x 6,0 85 x 3,0 85 x 4,0 90 x 3,0 90 x 4,0 90 x 6,0 95 x 6,0 100 x 4,0 100 x 6,0 110 x 6,0 115 x 3,0 120 x 4,0 120 x 6,0 D1 (6H) min max mm mm 33,376 34,376 33,835 32,752 36,376 37,376 36,835 35,752 38,376 37,835 40,376 39,835 38,752 43,376 42,835 41,752 46,376 45,835 44,752 48,376 47,835 50,376 49,835 48,752 52,752 51,670 55,670 60,752 59,670 63,670 66,752 65,670 68,752 67,670 65,505 72,752 71,670 69,505 75,670 73,505 81,752 80,670 86,752 85,670 83,505 88,505 95,670 93,505 103,505 111,752 115,670 113,505 33,676 34,676 34,210 33,252 36,676 37,676 37,210 36,252 38,676 38,210 40,676 40,210 39,252 43,676 43,210 42,252 46,676 46,210 45,252 48,676 48,210 50,676 50,210 49,252 53,252 52,270 56,270 61,252 60,270 64,270 67,252 66,270 69,252 68,270 66,305 73,252 72,270 70,305 76,270 74,305 82,252 81,270 87,252 86,270 84,305 89,305 96,270 94,305 104,305 112,252 116,270 114,305 mm 33,5 34,5 34,0 33,0 36,5 37,5 37,0 36,0 38,5 38,0 40,5 40,0 39,0 43,5 43,0 42,0 46,5 46,0 45,0 48,5 48,0 50,5 50,0 49,0 53,0 52,0 56,0 61,0 60,0 64,0 67,0 66,0 69,0 68,0 66,0 73,0 72,0 70,0 76,0 74,0 82,0 81,0 87,0 86,0 84,0 89,0 96,0 94,0 104,0 112,0 116,0 114,0 UNIFIED THREADS UNC Unified coarse thread ANSI/ASME B1.1 Nom size D - Gg/1“ inch (tpl) No 1 2 3 4 5 6 8 10 12 - 64 - 56 - 48 - 40 - 40 - 32 - 32 - 24 - 24 1/4 - 5/16 - 3/8 - 7/16 - 1/2 - 9/16 - 5/8 - 3/4 - 7/8 - 1“ - 1 1/8 - 1 1/4 - 1 3/8 - 1 1/2 - 1 3/4 - 2“ - 20 18 16 14 13 12 11 10 9 8 7 7 6 6 5 4 1/2 D1 (2B) min max mm mm mm 1,425 1,694 1,941 2,156 2,487 2,647 3,307 3,680 4,341 1,582 1,872 2,146 2,385 2,697 2,896 3,528 3,949 4,590 1,55 1,85 2,10 2,35 2,65 2,85 3,50 3,90 4,50 4,976 6,411 7,805 9,149 10,584 11,996 13,376 16,299 19,169 21,963 24,648 5,268 6,734 8,164 9,550 11,016 12,456 13,868 16,833 19,748 22,598 25,349 5,10 6,60 8,00 9,40 10,80 12,20 13,50 16,50 19,50 22,25 25,00 27,823 30,343 33,518 38,951 44,689 28,524 31,120 34,295 39,814 45,598 28,00 30,75 34,00 39,50 45,00 UNF Unified fine thread ANSI/ASME B1.1 Nom size D - Gg/1“ D1 (2B) min max inch (tpl) mm mm mm No 2 3 - 64 - 56 1,755 1,913 1,85 2,024 2,197 2,15 4 - 48 5 - 44 6 - 40 8 - 36 10 - 32 12 - 28 1/4 - 28 5/16 - 24 3/8 - 24 7/16 - 20 1/12 - 20 9/16 - 18 5/8 - 18 3/4 - 16 7/8 - 14 1“ - 12 1 1/8 - 12 1 1/4 - 12 1 3/8 - 12 1 1/2 - 12 2,271 2,550 2,817 3,401 3,967 4,503 5,367 6,792 8,379 9,738 11,326 12,761 14,348 2,459 2,741 3,012 3,597 4,168 4,716 5,580 7,038 8,626 10,030 11,618 13,084 14,671 2,40 2,70 2,95 3,50 4,10 4,60 5,50 6,90 8,50 9,90 11,50 12,90 14,50 17,330 20,262 17,689 20,663 17,50 20,40 23,109 23,569 23,25 26,284 26,744 26,50 29,459 29,919 29,50 32,634 33,094 32,75 35,809 36,269 36,00 UNEF Unified extra fine thread ANSI/ASME B1.1 Nom size D1 (2B) D - Gg/1“ min max inch (tpl) mm mm 1/4 - 32 5,491 5,679 5/16 - 32 3/8 - 32 7/16 - 28 1/12 - 28 9/16 - 24 5/8 - 24 3/4 - 20 7/8 - 20 1“ - 20 7,079 8,666 10,130 11,717 13,142 14,729 17,676 20,851 24,026 7,267 8,854 10,343 11,930 13,388 14,975 17,968 21,143 24,318 mm 5,55 7,15 8,70 10,20 11,80 13,20 14,80 17,80 20,95 24,15 UN-8 Unified thread ANSI/ASME B1.1 Nom size D - Gg/1“ D1 (2B) min max inch (tpl) mm mm mm 1 1/8 - 8 1 1/4 - 8 1 1/2 - 8 25,138 28,313 34,663 25,773 28,948 35,298 25,4 28,6 35,0 1 3/4 - 8 41,013 41,648 41,3 2“ -8 47,363 47,998 47,7 YOUR BENEFITS • Do more with less tooling • Reduce tooling inventory and costs • Get jobs up and running faster • Improve process stability and consitency • Process with a wider range of part materials with single universal- type tools • Uninterrupted machining operations • Less down-time • Process securtity DISCOVER OUR NEW VERSATILE TAPS T34 High performance HSSE-PM taps for materials with Rm up to 1200 MPa T32 HSSE taps for material with Rm up to 1000 MPa T33 Taps for cold forming of threads CYLINDRICAL PIPE THREADS TAPERED PIPE THREADS G Withworth pipe thread DIN EN ISO 228 Nom size D - P/1“ D1 min max inch (tpl) mm mm mm G 1/16 - 28 1/8 - 28 1/4 - 19 3/8 - 19 1/2 - 14 5/8 - 14 3/4 - 14 7/8 - 14 1“ - 11 1 1/8 - 11 1 1/4 - 11 1 3/8 - 11 1 1/2 - 11 1 5/8 - 11 1 3/4 - 11 2“ - 11 2 1/4 - 11 2 1/2 - 11 2 3/4 - 11 3“ - 11 6,561 8,566 11,445 14,950 18,631 20,587 24,117 27,877 30,291 34,939 38,952 41,365 44,845 49,030 50,788 56,656 62,752 72,226 78,576 84,926 6,843 8,848 11,890 15,395 19,172 21,128 24,658 28,418 30,931 35,579 39,592 42,005 45,485 49,670 51,428 57,296 63,392 72,866 79,216 85,566 6,80 8,80 11,80 15,25 19,00 21,00 24,50 28,25 30,75 35,50 39,50 41,75 45,25 49,50 51,00 57,00 63,30 72,80 79,10 85,50 Rp (BSPP) Cylindrical withworth pipe thread DIN EN 10226-1 and ISO 7-1 where pressure-tight joints are made on the threads Nom size D - P/1“ inch (tpl) Rp 1/16 - 28 1/8 - 28 1/4 - 19 3/8 - 19 1/12 - 14 3/4 - 14 1“ - 11 D1 min max mm mm 6,490 8,495 11,341 14,846 18,489 23,975 6,632 8,637 11,549 15,054 18,773 24,259 30,111 30,471 mm 6,55 8,60 11,50 15,00 18,50 24,00 30,25 NPSM American standard straight pipe thread ANSI/ASME B1 .20.1 for mechanical joints (previously NPS) Nom size D - P/1“ D1 min max inch (tpl) mm mm mm 1/8 - 27 9,093 9,246 9,1 1/4 - 18 11,887 12,217 12,0 3/8 - 18 15,316 15,545 15,5 1/8 - 14 18,974 19,279 19,0 3/4 - 14 24,333 24,638 24,5 1“ - 11 1/2 30,505 30,759 30,5 NPSF American Standard straight pipe thread ANSI B1 .20.3 dryseal internal straight pipe thread for fuel, com- bined with external tapered pipe thread NPTF of PTF-SAE-SHORT; Gauge with tapered gauges Nom size D - P/1“ D1 min max inch (tpl) mm mm 1/16 - 27 6,304 6,393 1/8 - 27 8,651 8,740 1/4 - 18 11,232 11,364 3/8 - 18 14,671 14,803 1/2 - 14 18,118 18,288 3/4 - 14 23,465 23,635 1“ - 11 1/2 29,464 29,670 mm 6,35 8,70 11,30 14,75 18,20 23,50 29,50 Drill cylindrically without using a reamer Rc (BSPT) Tapered withworth pipe thread DIN EN 10226-2 and ISO 7-1 where pressure-tight joints are made on the threads, taper 1:16 Nom size D1 t1 t4 D - P/1“ inch (tpi) mm mm mm Rc 1/16 - 28 6,15 11,1 9,5 1/8 - 28 8,15 11,1 9,5 1/4 - 19 10,85 16,3 14,0 3/8 - 19 14,30 16,7 14,4 1/2 - 14 17,80 22,3 19,1 3/4 - 14 23,20 23,6 20,4 1“ - 11 29,20 28,3 24,3 NPT American tapered pipe thread ANSI/ ASME B1.20.1 for threads with dryseal material taper 1:16 Nom size D1 t1 t4 D - P/1“ inch (tpi) mm mm mm 1/16 - 27 6,15 11,8 9,70 1/8 - 27 8,50 11,9 9,75 1/4 - 18 11,00 17,4 14,25 3/8 - 18 14,40 17,7 14,55 1/2 - 14 17,80 23,1 19,00 3/4 - 14 23,15 23,6 19,50 1“ - 11 1/2 29,05 28,4 23,40 1“ 1/4 - 11 1/2 37,80 28,9 23,90 1“ 1/2 - 11 1/2 43,85 28,9 23,90 2“ - 11 1/2 55,85 29,3 24,35 NPTF American tapered pipe thread ANSI B1.20.3 for threads with dryseal material taper 1:16 Nom size D1 t1 t4 D - P/1“ inch (tpi) mm mm mm 1/16 - 27 6,10 13,0 10,65 1/8 - 27 8,45 13,0 10,70 1/4 - 18 10,90 19,2 15,65 3/8 - 18 14,30 19,5 16,00 1/2 - 14 17,60 25,4 20,85 3/4 - 14 23,00 25,9 21,30 1“ - 11 1/2 28,75 31,1 25,60 1“ 1/4 - 11 1/2 37,50 31,7 26,15 1“ 1/2 - 11 1/2 43,75 31,7 26,15 2“ - 11 1/2 55,75 32,1 26,55 Drill cylindrically and prepare tapered hole with reamer Nom size D2 D3 t1 t4 D - P/1“ (JS11) inch (tpi) mm mm mm mm Rc 1/16 - 28 6,10 6,56 11,1 9,5 1/8 - 28 1/4 - 19 3/8 - 19 1/2 - 14 3/4 - 14 1“ - 11 8,10 8,57 11,1 9,5 10,75 11,45 16,3 14,0 14,25 14,95 16,7 14,4 17,70 18,63 22,3 19,1 23,10 24,12 23,6 20,4 29,10 30,29 28,3 24,3 Nom size D- inch 1/16 - 1/8 - 1/4 - 3/8 - 1/2 - 3/4 - 1“ - 1“ 1/4 - 1“ 1/2 - 2“ - P/1“ (tpi) 27 27 18 18 14 14 11 1/2 11 1/2 11 1/2 11 1/2 D2 mm 5,95 8,30 10,75 14,15 17,45 22,80 28,65 37,35 43,45 55,45 D3 +0,05 mm 6,39 8,74 11,36 14,80 18,32 23,67 29,69 38,45 44,52 56,56 t1 mm 11,8 11,9 17,4 17,7 23,1 23,6 28,4 28,9 28,9 29,3 t4 mm 9,70 9,75 14,25 14,55 19,00 19,50 23,40 23,90 23,90 24,35 Nom size D- inch 1/16 - 1/8 - 1/4 - 3/8 - 1/2 - 3/4 - 1“ - 1“ 1/4 - 1“ 1/2 - 2“ - P/1“ (tpi) 27 27 18 18 14 14 11 1/2 11 1/2 11 1/2 11 1/2 D2 mm 5,95 8,30 10,75 14,15 17,45 22,80 28,65 37,35 43,45 55,45 D3 +0,05 mm 6,41 8,76 11,40 14,84 18,33 23,68 29,72 38,48 44,55 56,59 t1 mm 13,0 13,0 19,2 19,5 25,4 25,9 31,1 31,7 31,7 32,1 t4 mm 10,65 10,70 15,65 16,00 20,85 21,30 25,60 26,15 26,15 26,55 Recommended preparation of blind holes (minimum length) Nom size D- inch Rc 1/16 - 1/8 - 1/4 - 3/8 - 1/2 - 3/4 - 1“ - P/1“ (tpi) 28 28 19 19 14 14 11 D3 (JS11) mm 6,56 8,57 11,45 14,95 18,63 24,12 30,29 b t min D4 min mm mm mm 5,6 9,9 7,6 +0,3 5,6 9,9 9,6 +0,3 8,4 14,6 13,0 +0,5 8,8 15,0 16,5+0,5 11,4 20,0 20,6+0,5 12,7 21,3 26,0 +0,5 14,5 25,4 32,8+0,5 Nom size D3 b t min D4 D - P/1“ +0,05 min inch (tpi) mm mm mm mm Rc 1/16 - 27 6,39 7,0 10,0 7,6 1/8 - 27 8,74 1/4 - 18 11,36 3/8 - 18 14,80 1/2 - 14 18,32 3/4 - 14 23,67 1“ - 11 1/2 29,69 1“ 1/4 - 11 1/2 38,45 1“ 1/2 - 11 1/2 44,52 2“ - 11 1/2 56,56 7,0 10,0 10,0 10,2 14,5 13,1 10,6 15,0 16,5 13,8 19,0 20,5 14,2 20,0 25,8 17,0 24,0 32,2 17,5 24,5 41,0 17,5 24,5 47,2 18,0 25,0 59,2 Nom size D- inch 1/16 - 1/8 - 1/4 - 3/8 - 1/2 - 3/4 - 1“ - 1“ 1/4 - 1“ 1/2 - 2“ - P/1“ (tpi) 27 27 18 18 14 14 11 1/2 11 1/2 11 1/2 11 1/2 D3 +0,05 mm 6,41 8,76 11,40 14,84 18,33 23,68 29,72 38,48 44,55 56,59 b +0,05 mm 8,0 8,0 11,6 12,0 15,6 16,0 19,2 19,7 19,7 20,2 t min mm 11,0 11,0 15,5 16,0 20,5 21,5 26,0 26,5 26,5 27,0 D4 min mm 7,4 9,8 12,9 16,3 20,3 25,6 32,0 40,8 47,0 59,0 COLD-FORMING OF THREADS M ISO Metric coarse thread DIN 13 Nom size DP mm mm M 1,0 0,25 mm 0,90 1,1 0,25 1,00 1,2 0,25 1,10 1,4 0,30 1,28 1,6 0,35 1,47 1,7 0,35 1,57 1,8 0,35 1,67 2,0 0,40 1,85 2,2 0,45 2,03 2,3 0,40 2,15 2,5 0,45 2,33 2,6 0,45 2,43 3,0 0,50 2,80 3,5 0,60 3,25 4,0 0,70 3,70 4,5 0,75 4,20 5,0 0,80 4,65 5,5 0,90 5,10 6,0 1,00 5,60 7,0 1,00 6,60 8,0 1,25 7,45 9,0 1,25 8,45 10,0 1,50 9,35 12,0 1,75 11,25 14,0 2,00 13,10 16,0 2,00 15,10 18,0 2,50 16,85 20,0 2,50 18,85 22,0 2,50 20,85 24,0 3,00 22,65 27,0 3,00 25,65 30,0 3,50 28,40 33,0 3,50 31,40 36,0 4,00 34,15 39,0 4,00 37,15 42,0 4,50 39,90 45,0 4,50 42,90 48,0 5,00 45,65 MF ISO Metric fine thread DIN 13 Nom size D P mm mm mm M 2,5 x 0,35 2,37 2,6 x 0,35 2,47 3,0 x 0,35 2,88 3,5 x 0,35 3,38 4,0 x 0,50 3,80 5,0 x 0,50 4,80 6,0 x 0,50 5,80 6,0 x 0,75 5,70 7,0 x 0,75 6,70 8,0 x 0,75 7,70 8,0 x 1,00 7,60 9,0 x 0,75 8,70 9,0 x 1,00 8,60 10,0 x 0,75 9,70 10,0 x 1,00 9,60 10,0 x 1,25 9,45 11,0 x 1,00 10,60 12,0 x 1,00 11,60 12,0 x 1,25 11,45 12,0 x 1,50 11,35 14,0 x 1,00 13,60 14,0 x 1,25 13,45 14,0 x 1,50 13,35 15,0 x 1,00 14,60 15,0 x 1,50 14,35 16,0 x 1,00 15,60 16,0 x 1,50 15,35 18,0 x 1,00 17,60 18,0 x 1,50 17,35 18,0 x 2,00 17,10 20,0 x 1,00 19,60 20,0 x 1,50 19,35 20,0 x 2,00 19,10 24,0 x 2,00 23,10 30,0 x 2,00 29,10 36,0 x 3,00 34,65 42,0 x 4,00 40,15 48,0 x 3,00 44,65 UNC Unified coarse thread ANSI/ASME B1.1 Nom size D P/1“ inch (tpi) mm No 4 - 40 2,55 5 - 40 2,90 6 - 32 3,15 8 - 32 3,80 10 - 24 4,35 12 - 24 5,00 1/4 - 20 5,75 5/16 - 18 7,30 3/8 - 16 8,80 7/16 - 14 10,25 1/2 - 13 11,80 9/16 - 12 13,30 5/8 - 11 14,80 3/4 - 10 17,85 7/8 - 9 20,90 1“ -8 23,90 G Withworth pipe thread DIN EN ISO 228 Nom size D P/1“ inch (tpi) mm G 1/16 - 28 7,25 1/8 - 28 9,25 1/4 - 19 12,55 3/8 - 19 16,05 1/2 - 14 20,10 5/8 - 14 22,05 3/4 - 14 25,60 7/8 - 14 29,35 1“ - 11 32,15 UNF Unified fine thread ANSI/ASME B1.1 Nom size D P/1“ inch (tpi) mm N0 2 - 64 2,02 3 - 56 2,32 4 - 48 2,62 5 - 44 2,92 6 - 40 3,22 8 - 36 3,85 10 - 32 4,45 12 - 28 5,10 1/4 - 28 5,95 5/16 - 24 7,45 3/8 - 24 9,05 7/16 - 20 10,55 1/2 - 20 12,15 9/16 - 18 13,65 5/8 - 18 15,25 3/4 - 16 18,35 7/8 - 14 21,40 1“ - 12 24,45 Thread Hole Preparatory Diameter for Cold-Forming Taps • Recommended diameters ensure the minor thread diameter meets M and MF tolerances (DIN 13-50). • Use stable clamping and new or like-new solid carbide twist drills. • Larger diameters can extend tool life but must keep the minor diameter within M and MF tolerances. HELICAL COIL THREADS FOR INSERTS STI M (EG) ISO Metric coarse thread DIN 8140-2 Nom size DEG D1EG D P min min max mm mm max mm mm EG M 2,5 0,45 3,084 2,597 2,697 3 0,50 3,650 3,108 3,220 4 0,70 4,910 4,152 4,292 5 0,80 6,040 5,174 5,334 6 1,00 7,300 6,217 6,407 8 1,25 9,624 8,271 8,483 10 1,50 11,948 10,324 10,560 12 1,75 14,274 12,379 12,644 14 2,00 16,598 14,433 14,733 16 2,00 18,598 16,433 16,733 18 2,50 21,248 18,541 18,896 20 2,50 23,248 20,541 20,896 mm 2,65 3,15 4,20 5,25 6,30 8,40 10,50 12,50 14,50 16,50 18,75 20,75 STI UNC (EG) Unified coarse thread ASME B 18.29.1 Nom size DEG D1EG D P/1“ min min max mm (tpi) max mm mm EG No 4 No 6 No 8 No 10 - 40 - 32 - 32 - 24 3,671 4,536 5,197 6,200 2,982 3,678 4,338 5,054 3,178 3,879 4,523 5,283 1/4 - 20 5/16 - 18 8,002 9,771 6,628 8,244 6,872 8,490 3/8 - 16 7/16 - 14 11,587 13,469 9,867 11,506 10,126 11,783 1/2 - 13 9/16 - 12 15,237 17,039 13,121 14,747 13,393 15,031 5/8 - 11 3/4 - 10 18,875 22,349 16,376 19,598 16,673 19,908 mm 3,10 3,80 4,40 5,20 6,70 8,40 10,00 11,60 13,30 14,90 16,50 19,75 STI UNF (EG) Unified fine thread ASME B 18.29.1 Nom size DEG D P/1“ min D1EG min max mm (tpi) max mm mm EG No 4 No 6 No 8 No 10 - 48 - 40 - 36 - 32 3,533 4,330 5,083 5,858 2,959 3,642 4,318 4,999 3,119 3,815 4,496 5,184 1/4 - 28 7,528 6,545 6,720 5/16 - 24 3/8 - 24 9,312 10,899 8,166 9,753 8,351 9,931 7/16 - 20 12,763 11,389 11,587 1/2 - 20 9/16 - 18 5/8 - 18 3/4 - 16 14,352 16,121 17,709 21,112 12,978 14,594 16,182 19,392 13,176 14,800 16,388 19,608 mm 3,00 3,70 4,40 5,10 6,60 8,25 9,80 11,50 13,10 14,70 16,25 19,50 HOLE OPTIMIZATION Different factors can influence the hole size: • Diameter tolerance of the drill • Concentricity of the tool • Toolholder selection • Better chip evacutation • Cutting fluid selection • Optimal tool wear • Increased stability on the machine and workpiece DRILL TIPS: • Use the largest drill size possible to minimize tapping issues and extend tool life. • Aim for a minor diameter that results in the lowest percentage of full thread with adequate strength. • A 55% to 65% thread of the minor diameter is usually sufficient for most applications. • In some cases, a higher percentage of thread may be required to meet thread class specifications. HOLE SIZES: Up to 20 mm • Seco Feedmax™ • Seco Universal < 2 mm • Seco Feedmax™ Micro Drill 10-26 mm • Crownloc® and Crownloc® Plus > 26 mm • Perfomax® BRITISH THREADS BSW Withworth thread BS 84 Nom size D - P/1“ D1 min max inch (tpl) mm mm mm BSW 1/16 - 60 1,045 1,230 1,15 3/32 - 48 1/8 - 40 5/32 - 32 3/16 - 24 7/32 - 24 1/4 - 20 5/16 - 18 3/8 - 16 1,704 1,912 1,85 2,362 2,591 2,55 2,952 3,214 3,20 3,406 3,744 3,70 4,201 4,539 4,50 4,724 5,156 5,10 6,129 6,589 6,50 7,493 7,988 7,90 7/16 - 14 8,791 9,332 9,25 1/2 - 12 9,987 10,589 10,50 9/16 - 12 11,575 12,177 12,00 5/8 - 11 12,918 13,559 13,50 3/4 - 10 15,799 16,485 16,40 7/8 - 9 18,613 19,355 19,25 1“ - 8 21,336 22,149 22,00 1“ 1/8 - 7 23,927 24,831 24,75 1“ 1/4 - 7 27,102 28,006 27,75 1“ 3/8 - 6 29,504 30,528 30,50 1“ 1/2 - 6 32,680 33,703 33,50 1“ 5/8 - 5 34,769 39,136 39,00 1“ 3/4 - 5 37,943 39,136 39,00 1“ 7/8 - 4 1/2 40,396 41,702 41,50 2“ - 4 1/2 43,571 44,877 44,50 BSF Withworth fine thread BS 84 Nom size D - P/1“ D1 min max inch (tpl) mm mm mm BSF 3/16 - 32 3,747 4,006 4,00 1/4 - 26 5/16 - 22 3/8 - 20 7/16 - 18 1/2 - 16 5/8 - 14 3/4 - 12 7/8 - 11 5,100 6,459 7,899 9,304 10,668 13,553 16,337 19,268 5,398 6,817 8,331 9,769 11,163 14,094 16,969 19,909 5,30 6,80 8,30 9,70 11,10 14,00 16,75 19,75 1“ - 10 22,149 22,835 22,75 THREADS FOR THE AEROSPACE INDUSTRY MJ MJ thread DIN ISO 5855 Nom size Dx P D1 min max mm mm mm mm mm MJ 3 x 0,50 2,513 2,653 2,6 4 x 0,70 3,318 3,498 3,4 5 x 0,80 4,221 4,421 4,3 6 x 1,00 5,026 5,216 5,1 8 x 1,00 7,025 7,216 7,1 8 x 1,25 6,782 6,994 6,9 10 x 1,25 8,782 8,994 8,9 10 x 1,50 8,539 8,775 8,6 UNJF Unified fine thread ASME B1.15 Nom size D - P/1“ D1 min max inch (tpi) mm mm mm No 4 - 48 2,329 2,466 2,40 6 - 40 2,888 3,053 3,00 8 - 36 3,480 3,663 3,55 10 - 32 4,054 4,255 4,15 1/4 - 28 5/16 - 24 5,466 5,662 5,55 6,906 7,109 7,00 3/8 - 24 8,494 8,679 8,60 UNJC Unified coarse thread ASME B1.15 Nom size D - P/1“ D1 min max inch (tpi) mm mm mm No 4 - 40 2,228 2,393 2,30 6- 8- 10 - 1/4 - 5/16 - 3/8 - 32 2,733 2,939 32 3,393 3,599 24 3,795 4,064 20 5,113 5,387 18 6,563 6,833 16 7,978 8,255 2,85 3,50 3,90 5,25 6,70 8,10 TRAPEZOIDAL AND ROUND THREADS TR ISO Metric trapezodial coarse thread DIN 103 Nom size DxP D1 (7H) min max mm mm mm mm mm TR 8 x 1,5 9 x2 10 x 2 10 x 3 11 x 3 12 x 3 14 x 3 14 x 4 16 x 4 18 x 4 20 x 4 22 x 5 24 x 5 26 x 5 28 x 5 30 x 6 32 x 6 34 x 6 36 x 6 38 x 7 40 x 7 42 x 7 44 x 7 46 x 8 48 x 8 50 x 8 52 x 8 6,5 7 8 7 8 9 11 10 12 14 16 17 19 21 23 24 26 28 30 31 33 35 37 38 40 42 44 6,690 7,236 8,236 7,315 8,315 9,315 11,315 10,375 12,375 14,375 16,375 17,450 19,450 21,450 23,450 24,500 26,500 28,500 30,500 31,560 33,560 35,560 37,560 38,630 40,630 42,630 44,630 6,60 7,20 8,20 7,25 8,25 9,25 11,25 10,25 12,25 14,25 16,25 17,25 19,25 21,25 23,25 24,25 26,25 28,25 30,25 31,50 33,50 35,50 37,50 38,50 40,50 42,50 44,50 Rd Round thread DIN 405 Nom size D x P/1“ mm (tpi) Rd 8 x 10 9 x 10 10 x 10 11 x 10 12 x 10 14 x 8 16 x 8 18 x 8 20 x 8 22 x 8 24 x 8 26 x 8 28 x 8 30 x 8 D1 (7H) min max mm mm 5,714 6,714 7,714 8,714 9,714 11,142 13,142 15,142 17,142 19,142 21,142 23,142 25,142 27,142 6,164 7,164 8,164 9,164 10,164 11,672 13,672 15,672 17,672 19,672 21,672 23,672 25,672 27,672 mm 6,0 7,0 8,0 9,0 10,0 11,5 13,5 15,5 17,5 19,5 21,5 23,5 25,5 27,5 CROWN- SECO UNVERSAL LOC® PLUS SECO FEEDMAX™ PERFOMAX® GT24-121 Copyright © 2024 Seco Tools, LLC Printed in USA. All rights reserved.
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