Sti Taps
 |
Before screw thread insert installation , the drilled hole has to be tapped with a STI hand tap or machine tap of the correct tap size.
Types of STI Taps available include:
1. Standard Plug screw thread insert taps (4-Thread Chamfer): Easy starting for through-holes and blind holes.
2.Standard Bottoming screw thread insert taps (2-Thread Chamfer): Ideal for blind holes that are drilled to a minimum depth.
3.Spiral Pointed Plug screw thread insert taps (4-Thread Chamfer): Free-cutting for use in long through-holes and in blind holes
with chip clearance.
4.Spiral Flute Bottoming screw thread insert taps (2-Thread Chamfer): Pulls chips out of deep or blind holes in soft materials.
Unified Thread Series
| thread size | overall length | thread length | shank Dia. | Square drive | thread size | overall length | thread length | shank Dia. | Square drive | |
2-56 | 1.875 | 0.562 | 0.141 | 0.110 | 3-56 | 1.937 | 0.625 | 0.141 | 0.110 | |
3-48 | 1.937 | 0.625 | 0.141 | 0.110 | 4-48 | 2.000 | 0.687 | 0.141 | 0.110 | |
4-40 | 2.000 | 0.687 | 0.141 | 0.110 | 6-40 | 2.125 | 0.750 | 0.168 | 0.131 | |
5-40 | 2.125 | 0.750 | 0.168 | 0.131 | 8-36 | 2.375 | 0.937 | 0.220 | 0.165 | |
6-32 | 2.375 | 0.875 | 0.194 | 0.152 | 10-32 | 2.500 | 1.000 | 0.255 | 0.191 | |
8-32 | 2.375 | 0.937 | 0.220 | 0.165 | 12-28 | 2.718 | 1.125 | 0.318 | 0.238 | |
10-24 | 2.500 | 1.000 | 0.255 | 0.191 | 1/4-28 | 2.718 | 1.125 | 0.318 | 0.238 | |
12-24 | 2.718 | 1.125 | 0.318 | 0.238 | 5/16-24 | 2.937 | 1.250 | 0.381 | 0.286 | |
1/4-20 | 2.718 | 1.125 | 0.318 | 0.238 | 3/8-24 | 3.156 | 1.438 | 0.323 | 0.242 | |
5/16-18 | 2.937 | 1.250 | 0.381 | 0.286 | 7/16-20 | 3.375 | 1.656 | 0.367 | 0.275 | |
3/8-16 | 3.375 | 1.656 | 0.367 | 0.275 | 1/2-20 | 3.593 | 1.656 | 0.429 | 0.322 | |
7/16-14 | 3.593 | 1.656 | 0.429 | 0.322 | 9/16-18 | 3.812 | 1.812 | 0.480 | 0.360 | |
1/2-13 | 3.812 | 1.812 | 0.480 | 0.360 | 5/8-18 | 4.031 | 1.812 | 0.542 | 0.406 | |
9/16-12 | 4.031 | 1.812 | 0.542 | 0.406 | 3/4-16 | 4.468 | 2.000 | 0.652 | 0.489 | |
5/8-11 | 4.250 | 2.000 | 0.590 | 0.442 | 7/8-14 | 5.125 | 2.500 | 0.800 | 0.600 | |
3/4-10 | 4.687 | 2.218 | 0.697 | 0.523 | 1-12 | 5.437 | 2.562 | 0.896 | 0.672 | |
7/8-9 | 5.125 | 2.500 | 0.800 | 0.600 | 1-14 | 5.437 | 2.562 | 0.896 | 0.672 | |
1-8 | 5.750 | 2.562 | 1.021 | 0.766 | 11/8-12 | 5.750 | 2.562 | 1.021 | 0.766 | |
11/8-7 | 6.062 | 3.000 | 1.108 | 0.831 | 11/4-12 | 6.062 | 3.000 | 1.108 | 0.831 | |
11/4-7 | 6.375 | 3.000 | 1.233 | 0.925 | 13/8-12 | 6.375 | 3.000 | 1.233 | 0.925 | |
13/8-6 | 6.687 | 3.187 | 1.305 | 0.979 | 11/2-12 | 6.687 | 3.187 | 1.305 | 0.979 | |
11/2-6 | 7.000 | 3.187 | 1.430 | 1.072 |
Metric Series
| thread size | overall length | thread length | shank Dia. | Square drive |
M2 x 0.4 | 45 | 10 | 2.80 | 2.24 |
M2.2 x 0.45 | 48 | 11 | 3.15 | 2.50 |
M2.5 x 0.45 | 48 | 11 | 3.15 | 2.50 |
M3 x 0.5 | 50 | 13 | 3.55 | 2.80 |
M3.5 x 0.6 | 53 | 13 | 4.50 | 3.55 |
M4 x 0.7 | 58 | 16 | 5.00 | 4.00 |
M5 x 0.8 | 66 | 19 | 6.30 | 5.00 |
M6 x 1 | 72 | 22 | 8.00 | 6.30 |
M7 x1 | 72 | 22 | 9.00 | 7.10 |
M8 x 1.25 | 80 | 24 | 10.00 | 8.00 |
M9 x 1.25 | 85 | 25 | 8.00 | 6.30 |
M10 x 1.5 | 89 | 29 | 9.00 | 7.10 |
M11 x 1.5 | 89 | 29 | 9.00 | 7.10 |
M12 x 1.75 | 95 | 30 | 11.20 | 9.00 |
M14 x 2 | 102 | 32 | 12.50 | 10.00 |
M15 x 2 | 112 | 37 | 14.00 | 11.20 |
M16 x 2 | 112 | 37 | 14.00 | 11.20 |
M18 x 2.5 | 118 | 38 | 16.00 | 12.50 |
M20 x 2.5 | 130 | 45 | 18.00 | 14.00 |
M22 x 2.5 | 135 | 48 | 20.00 | 16.00 |
M24 x 3 | 135 | 48 | 20.00 | 16.00 |
M27 x 3 | 151 | 51 | 22.40 | 18.00 |
M30 x 3.5 | 162 | 57 | 25.00 | 20.00 |
M30 x 3 | 162 | 57 | 25.00 | 20.00 |
M33 x 3.5 | 170 | 60 | 28.00 | 22.40 |
M36 x 4 | 170 | 60 | 28.00 | 22.40 |
M39 x 4 | 187 | 67 | 31.50 | 25.00 |
M42 x 4.5 | 187 | 67 | 31.50 | 25.00 |
M42 X 4 | 200 | 70 | 35.50 | 28.00 |
M52 X 5 | 221 | 76 | 40.00 | 31.50 |