Product Description
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.
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 | | | | | | |
