THREAD HOLE PREPARATORY DIAMETERS 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 with high performance HSSE-PM taps CYLINDRICAL PIPE THREADS 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, combined 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 mm 1/16 - 27 6,304 6,393 6,35 1/8 - 27 8,651 8,740 8,70 1/4 - 18 11,232 11,364 11,30 3/8 - 18 14,671 14,803 14,75 1/2 - 14 18,118 18,288 18,20 3/4 - 14 23,465 23,635 23,50 1“ - 11 1/2 29,464 29,670 29,50 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“ D1 min max inch (tpl) mm mm mm Rp 1/16 - 28 6,490 6,632 6,55 1/8 - 28 8,495 8,637 8,60 1/4 - 19 11,341 11,549 11,50 3/8 - 19 14,846 15,054 15,00 1/12 - 14 18,489 18,773 18,50 3/4 - 14 23,975 24,259 24,00 1“ - 11 30,111 30,471 30,25 TAPERED PIPE THREADS BRITISH THREADS BSW Withworth thread BS 84 Nom size D1 D - P/1“ min max inch (tpl) mm mm mm BSW 1/16 - 60 1,045 1,230 1,15 3/32 - 48 1,704 1,912 1,85 1/8 - 40 2,362 2,591 2,55 5/32 - 32 2,952 3,214 3,20 3/16 - 24 3,406 3,744 3,70 7/32 - 24 4,201 4,539 4,50 1/4 - 20 4,724 5,156 5,10 5/16 - 18 6,129 6,589 6,50 3/8 - 16 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 5,100 5,398 5,30 5/16 - 22 6,459 6,817 6,80 3/8 - 20 7,899 8,331 8,30 7/16 - 18 9,304 9,769 9,70 1/2 - 16 10,668 11,163 11,10 5/8 - 14 13,553 14,094 14,00 3/4 - 12 16,337 16,969 16,75 7/8 - 11 19,268 19,909 19,75 1“ - 10 22,149 22,835 22,75 TRAPEZOIDAL AND ROUND THREADS 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 UNJC Unified coarse thread ASME B1.15 Nom size D1 D - P/1“ min max inch (tpi) mm mm mm No 4 - 40 2,228 2,393 2,30 6 - 32 2,733 2,939 2,85 8 - 32 3,393 3,599 3,50 10 - 24 3,795 4,064 3,90 1/4 - 20 5,113 5,387 5,25 5/16 - 18 6,563 6,833 6,70 3/8 - 16 7,978 8,255 8,10 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 5,466 5,662 5,55 5/16 - 24 6,906 7,109 7,00 3/8 - 24 8,494 8,679 8,60 HELICAL COIL THREADS FOR INSERTS UNIFIED THREADS UN-8 Unified thread ANSI/ASME B1.1 Nom size D1 (2B) D - Gg/1“ min max inch (tpl) mm mm mm 1 1/8 - 8 25,138 25,773 25,4 1 1/4 - 8 28,313 28,948 28,6 1 1/2 - 8 34,663 35,298 35,0 1 3/4 - 8 41,013 41,648 41,3 2“ - 8 47,363 47,998 47,7 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 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® Drill cylindrically without using a reamer Drill cylindrically and prepare tapered hole with reamer Recommended preparation of blind holes (minimum length) 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 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 8,10 8,57 11,1 9,5 1/4 - 19 10,75 11,45 16,3 14,0 3/8 - 19 14,25 14,95 16,7 14,4 1/2 - 14 17,70 18,63 22,3 19,1 3/4 - 14 23,10 24,12 23,6 20,4 1“ - 11 29,10 30,29 28,3 24,3 Nom size D3 b t min D4 D - P/1“ (JS11) min inch (tpi) mm mm mm mm Rc 1/16 - 28 6,56 5,6 9,9 7,6 +0,3 1/8 - 28 8,57 5,6 1/4 - 19 11,45 8,4 3/8 - 19 14,95 8,8 1/2 - 14 18,63 11,4 3/4 - 14 24,12 12,7 1“ - 11 30,29 14,5 9,9 9,6 +0,3 14,6 13,0 +0,5 15,0 16,5+0,5 20,0 20,6+0,5 21,3 26,0 +0,5 25,4 32,8+0,5 TR ISO Metric trapezodial coarse thread DIN 103 Nom size DxP mm mm TR 8 x 1,5 9x2 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 D1 (7H) min max mm mm 6,5 6,690 7 7,236 8 8,236 7 7,315 8 8,315 9 9,315 11 11,315 10 10,375 12 12,375 14 14,375 16 16,375 17 17,450 19 19,450 21 21,450 23 23,450 24 24,500 26 26,500 28 28,500 30 30,500 31 31,560 33 33,560 35 35,560 37 37,560 38 38,630 40 40,630 42 42,630 44 44,630 mm 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 D1 (7H) D x P/1“ min max mm (tpi) mm mm mm Rd 8 x 10 5,714 6,164 6,0 9 x 10 6,714 7,164 7,0 10 x 10 7,714 8,164 8,0 11 x 10 8,714 9,164 9,0 12 x 10 9,714 10,164 10,0 14 x 8 11,142 11,672 11,5 16 x 8 13,142 13,672 13,5 18 x 8 15,142 15,672 15,5 20 x 8 17,142 17,672 17,5 22 x 8 19,142 19,672 19,5 24 x 8 21,142 21,672 21,5 26 x 8 23,142 23,672 23,5 28 x 8 25,142 25,672 25,5 30 x 8 27,142 27,672 27,5 INFORMATION ON OTHER SECO THREADING PRODUCTS CAN BE FOUND IN THE THREADING CATALOG. EG M (STI) ISO Metric coarse thread DIN 8140-2 Nom size DEG D1EG D P min min max mm mm max mm mm mm EG M 2,5 0,45 3,084 2,597 2,697 2,65 3 0,50 3,650 3,108 3,220 3,15 4 0,70 4,910 4,152 4,292 4,20 5 0,80 6,040 5,174 5,334 5,25 6 1,00 7,300 6,217 6,407 6,30 8 1,25 9,624 8,271 8,483 8,40 10 1,50 11,948 10,324 10,560 10,50 12 1,75 14,274 12,379 12,644 12,50 14 2,00 16,598 14,433 14,733 14,50 16 2,00 18,598 16,433 16,733 16,50 18 2,50 21,248 18,541 18,896 18,75 20 2,50 23,248 20,541 20,896 20,75 EG UNC (STI) Unified coarse thread ASME B 18.29.1 Nom size DEG D - P/1“ min D1EG min max mm (tpi) max mm mm mm EG No 4 - 40 3,671 2,982 3,178 3,10 No 6 - 32 4,536 3,678 3,879 3,80 No 8 - 32 5,197 4,338 4,523 4,40 No 10 - 24 6,200 5,054 5,283 5,20 1/4 - 20 8,002 6,628 6,872 6,70 5/16 - 18 9,771 8,244 8,490 8,40 3/8 - 16 11,587 9,867 10,126 10,00 7/16 - 14 13,469 11,506 11,783 11,60 1/2 - 13 15,237 13,121 13,393 13,30 9/16 - 12 17,039 14,747 15,031 14,90 5/8 - 11 18,875 16,376 16,673 16,50 3/4 - 10 22,349 19,598 19,908 19,75 EG UNF (STI) Unified fine thread ASME B 18.29.1 Nom size DEG D - P/1“ min D1EG min max mm (tpi) max mm mm mm EG No 4 - 48 3,533 2,959 3,119 3,00 No 6 - 40 4,330 3,642 3,815 3,70 No 8 - 36 5,083 4,318 4,496 4,40 No 10 - 32 5,858 4,999 5,184 5,10 1/4 - 28 7,528 6,545 6,720 6,60 5/16 - 24 9,312 8,166 8,351 8,25 3/8 - 24 10,899 9,753 9,931 9,80 7/16 - 20 12,763 11,389 11,587 11,50 1/2 - 20 14,352 12,978 13,176 13,10 9/16 - 18 16,121 14,594 14,800 14,70 5/8 - 18 17,709 16,182 16,388 16,25 3/4 - 16 21,112 19,392 19,608 19,50 CROWNLOC® SECO UNVERSAL PLUS SECO FEEDMAX™ PERFOMAX®
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