Stub ACME Thread ANSI/ASME B1.8-1977

The ACME thread was developed as a compromise, to offer better strength than a V-form while overcoming the problems with the square thread form.
Diameter
"		 Diameter
mm		 Tapping Drill Size
mm		 TPI Pitch
mm
1/4" - 16 STUB ACME 6,350 5,398 16 1,588
5/16" - 14 STUB ACME 7,938 6,123 14 1,814
3/8" - 12 STUB ACME 9,525 8,255 12 2,117
7/16" - 12 STUB ACME 11,112 9,843 12 2,117
1/2" - 10 STUB ACME 12,700 11,176 10 2,540
5/8" - 8 STUB ACME 15,875 13,970 8 3,175
3/4" - 6 STUB ACME 19,050 16,510 12 2,117
7/8" - 6 STUB ACME 22,225 19,685 6 4,233
1" - 5 STUB ACME 25,400 22,352 5 5,080
1 1/8" - 5 STUB ACME 28,575 25,527 5 5,080
1 1/4" - 5 STUB ACME 31,750 28,702 5 5,080
1 3/8" - 4 STUB ACME 34,925 31,115 4 6,350
1 1/2" - 4 STUB ACME 38,100 34,290 4 6,350
1 3/4" - 4 STUB ACME 44,450 40,640 4 6,350
2" - 4 STUB ACME 50,800 46,990 4 6,350
2 1/4" - 3 STUB ACME 57,150 52,070 3 8,467
2 1/2" - 3 STUB ACME 63,500 58,420 3 8,467
2 3/4" - 3 STUB ACME 69,850 64,770 3 8,467
3" - 2 STUB ACME 76,200 68,580 2 12,700
3 1/2" - 2 STUB ACME 88,900 81,280 2 12,700
4" - 2 STUB ACME 101,600 93,980 2 12,700
4 1/2" - 2 STUB ACME 114,300 106,680 2 12,700
5" - 2 STUB ACME 127,000 119,380 2 12,700
Nut Washer
Screw Nut