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Tap Sizes
Standard Tap pre-drill sizes
| Standard | Metric | ||
| Tap Sizes | Pre-tap | Tap sizes | Pre-tap |
| 2-56 | .070 | M2 X .4 | .063 |
| 4-40 | .089 | M2.5 X .45 | .081 |
| 6-32 | .109 | M3 X .5 | .098 |
| 8-32 | .136 | M4 X .7 | .128 |
| 10-32 | .161 | M5 X .8 | .166 |
| 10-24 | .147 | M6 X 1 | .196 |
| 1/4-20 | .203 | M8 X 1.25 | .265 |
| 1/4-28 | .214 | M10 X1.5 | .332 |
| 5/16-18 | .257 | M12 X 1.75 | .404 |
| 5/16-24 | .272 | M14 X 2 | .469 |
| 3/8-16 | .312 | M16 X 2 | .547 |
| 3/8-24 | .332 | ||
Roll Form Tap pre-drill sizes
| Standard | Metric | ||
| Tap Sizes | Pre-tap | Tap sizes | Pre-tap |
| 2-56 | .078 | M2 X .4 | .072 |
| 4-40 | .101 | M2.5 X .45 | .090 |
| 6-32 | .125 | M3 X .5 | .110 |
| 8-32 | .150 | M4 X .7 | .144 |
| 10-32 | .175 | M5 X .8 | .183 |
| 10-24 | .172 | ||
| 1/4-20 | .218 | ||
We appreciate your interest in Prototek, and look forward to demonstrating that commitment to quality does not have to be subservient to price and delivery.
We recently completed the expansion of our machine shop to over 6000 sq. feet, so our turn-around times remain among the fastest in the industry!
Our new Birmingham R-0535H power rolls are the latest addition to our facility, increasing our forming capabilities to better meet your needs.
We recently completed the expansion of our machine shop to over 6000 sq. feet, so our turn-around times remain among the fastest in the industry!
Our new Birmingham R-0535H power rolls are the latest addition to our facility, increasing our forming capabilities to better meet your needs.
Enter your e-mail address to chat with one of our qualified engineers, customer service reps or a salesperson now.
In September of 2005, the Prototek team campaigned to collect much needed supplies for Hurricane Katrina victims. We drove 4 trucks to Biloxi and Gulfport Mississippi to distribute these goods to the devastated people of those regions.
