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Machine Shop and Tool Talk Shop Equipment, fabrication, repairs, how to fix it, which tool to use for the job. Machinist shop talk, straight to the point.

Machine Shop and Tool Talk

Taps and Dies Purpose?

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Old 09-26-2017, 04:00:41 PM
BillWojo BillWojo is offline
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Location: Burlington, New Jersey
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Default Re: Taps and Dies Purpose?

^^^^ What tdmidget said. Did you used to hang out at Practical Machinist? I am MrBridgeport over there. Haven't stopped by there in ages.
Anyway, only buy quality taps, the stuff a real machine shop uses. Yes, they are expensive but cheap in the long run. Look at flea markets for stuff and stay away from the old stuff. The newer generation of cutting tools is a vast improvement over what came before. Look for spiral point and spiral plug taps.
By the way, on the side of a tap you will see a GH number. Number 3 will cut a standard size thread, Number 4 or larger is used if the part is going to be plated and each increase in number size cuts the thread oversized by 0.0005. That's why if you tap a part with a GH7 tap, the fastener will seem loose.

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