When I have a 1/4" bolt do I drill use 1/4" hole when I'm going to tap the threads?

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When I have a 1/4" bolt do I drill use 1/4" hole when I'm going to tap the threads?

2006-09-05 03:16:00 · 4 answers · asked by crash279 1 in Cars & Transportation ➔ Maintenance & Repairs

4 answers

No, you want a smaller hole. Try a 3/16 hole or even a 32nd or 64th smaller than the 3/16 inch.

2006-09-05 03:36:37 · answer #1 · answered by Thomas S 6 · 1⤊ 0⤋

He's right, it's a no. 7 drill for tapping, but if you have a drill bit set and don't have a no.7, try something just a bit smaller than 1/4", like maybe a 7/32, or possibly a 13/64".

2006-09-05 10:25:31 · answer #2 · answered by mxzptlk 5 · 1⤊ 0⤋

no, a 1/4 20 bolt takes a no. 7 drill bit just drilled for holes saturday for tapping

2006-09-05 10:19:12 · answer #3 · answered by twopipes1 3 · 1⤊ 0⤋

For Standard tread (20 threads per inch) use a #7 (0.201) drill bit. For SAE (20 Threads per inch) use a #3 (0.213) bit.

2006-09-05 10:23:04 · answer #4 · answered by colglennlarson 3 · 1⤊ 0⤋