Prototek Sheetmetal Fabrication
rapid prototyping of precision machining Prototyping Precision Sheetmetal and Machining
TAP SIZES
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 | ||
Parts we Fabricate
- Assemblies
- Base plates
- Brackets
- Bodies
- Bushings
- Chassis
- Clamps
- Clips
- Covers
- Enclosures
- Fixtures
- Frames
- Heat Sinks
- Nozzles
- Panels
- Shafts
- Weldments
New & Events
Prototek is now
ISO 9001:2008
Certified and the Only company in the US to have the
latest Amada LC-C1 Laser/Turret co
mbo machine.
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