Tech Tips Index RASK CYCLE  TECH TIPS

U.N.E.F   SCREW THREADS
Dia. (Inch) No/Threads Core Dia.(Inch) Tap Drill   Dia. (Inch No/Threads Core Dia.(Inch) Tap Drill   Dia. (Inch No/Threads Core Dia.(Inch) Tap Drill
1/4 32 .2162 5-60 mm   3/4 20 .6959 45/64 in   1-1/4 18 1.899 1.196 in
5/16 32 .2787 7-20 mm   13/16 20 .7584 49/64 in   1-5/16 18 1.2524 32.00 mm
3/8 32 .3412 11/32

 in

   7/8 20 .8209 53/64

in

   1-3/8 18 1.3149 33-50 mm
7/16 28 .3988 10-20 mm   15/16 20 .8834 57/64

in

   1-7/16 18 1.3774 1.385 ins
1/2 28 .4613 11-80 mm   1 20 .9459 61/64

in

   1-1/2 18 1.4399 1.447

 in
9/16 24 .5174 13-30 mm   1-1/16 18 1.0024 1.010

in

   1-9/16 18 1.4948 1-1/2

in
5/8 24 .5799 14-75 mm   1-1/8 18 1.0649 1.072
in		   1-5/8 18 1.5649 1.572

in
11/16 24 .6424 .6480 in   1-3/16 18 1.1274 1.135
in		   1-11/16 18 1.6274 41.50 mm
   

B.A SCREW THREADS
No. Dia of Bolts Threads Per inch Dia. Tap Drill Core Dia   No. Dia of Bolts Threads Per inch Dia. Tap Drill Core Dia
0 .2362 25.4 .1960 .1890   9 .0748 65.1 .0635 .0564
1 .2087 28.2 .1770 .1661   10 .0669 72.6 .0550 .0504
2 .1850 31.4 .1520 .1468   11 .0591 81.9 .0465 .0445
3 .1614 34.8 .1360 .1269   12 .0511 90.9 .0400 .0378
4 .1417 38.5 .1160 .1106   13 .0472 102.0 .0360 .0352
5 .1260 43.0 .1040 .0981   14 .0394 109.9 .0292 .0280
6 .1102 47.9 .0935 .0852   15 0.354 120.5 .0260 .0250
7 .0984 52.9 .0810 .0738   16 .0311 133.3 .0225 .0220
8 .0866 59.1 .0730 .0663    

  

B.S.W SCREW THREADS
Dia of Bolt(Inch) Threads per Inch Dia. Tap Drill (Inch) Core Dia   Dia of Bolt(Inch) Threads per Inch Dia. Tap Drill (Inch) Core Dia
1/4 20 .1968 .1860   11/16 11 37/64 .5711
5/16 18 1/4 .2412   3/4 10 41/645 .6219
3/8 16 5/16 .2950   13/16 10 45/64 .6844
7/16 14 23/64 .3460   7/8 9 3/4 .7327
1/2 12 13/32 .3933   15/16 9 13/16 .7952
9/16 12 15/32 .4558   1 8 55/64 .8399
5/8 11 17/32 .5086