Threaded Insert Number Of Coils In The Free State (UNF)

Nominal
Diameter		 Pitch
(mm)		 Drill Bit
Diameter (mm)		 Drilling Diameter Tap Number Of Coils In The Free State
min. max. Min Outer
Diameter		 1d 1.5d 2d 2.5d 3d
2-64 0.396 2.3 2.29 2.44 2.70 3.5 5.6 8.0 10.4 12.5
3-56 0.453 2.7 2.62 2.77 3.10 3.4 5.6 8.0 10.4 12.6
4-48 0.529 3.0 2.97 3.14 3.53 3.4 5.6 7.9 10.2 12.5
6-40 0.635 3.8 3.66 3.81 4.33 3.8 6.0 8.4 10.8 13.2
8-36 0.706 4.4 4.32 4.47 5.08 4.0 6.6 9.1 11.7 14.2
10-32 0.794 5.1 5.00 5.16 5.86 4.1 6.8 9.5 12.1 14.9
1/4-28 0.907 6.7 6.55 6.72 7.53 5.0 8.1 11.3 14.4 17.6
5/16-24 1.058 8.3 8.17 8.35 9.31 5.5 8.9 12.2 15.6 19.0
3/8-24 1.058 9.9 9.75 9.93 10.90 6.9 10.9 14.9 19.0 23.2
7/16-20 1.270 11.5 11.39 11.59 12.76 6.6 10.6 14.5 18.4 22.5
1/2-20 1.270 13.1 12.97 13.16 14.35 7.8 12.3 16.8 21.3 25.9
9/16-18 1.411 14.7 14.59 14.79 16.12 7.9 12.5 17.1 21.6 26.2
5/8-18 1.411 16.3 16.18 16.38 17.71 8.9 14.1 19.1 24.3 29.4
3/4-16 1.588 19.5 19.39 19.60 21.11 9.7 15.1 20.6 26.0 31.5
7/8-14 1.814 22.7 22.62 22.84 24.58 9.9 15.4 21.0 26.6 32.2
1″-14 1.814 26.0 25.86 26.11 27.76 11.5 17.9 24.3 30.6 37.0
1″-12 2.117 26.0 25.86 26.11 28.15 9.7 15.1 20.6 26.1 31.5
1″ 1/8-12 2.117 29.2 29.03 29.29 31.33 11.1 17.3 23.4 29.6 35.7
1″ 1/4-12 2.117 32.4 32.21 32.21 34.50 12.4 19.3 26.1 33.0 39.8
1″ 3/8-12 2.117 35.5 35.38 35.38 37.68 13.8 21.3 28.9 36.5 44.0
1″ 1/2-12 2.117 38.7 38.56 38.56 40.85 15.2 23.4 31.6 39.8 48.2

All information is strictly informative