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Old 12-13-2006, 11:39 AM
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Material size for tapping with a die

Hey group,

I had a question. I would like to tap this rod that I have to 3/4-16" thread with a die. Is there a formula or chart for what size the original material should be to that I can tap it to 3/4-16"? I know that the end has to have a 45? chamfer, but I have not been able to find anywhere that details the original material diameter. Thanks

zip

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Old 12-13-2006, 11:45 AM
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If you are threading a rod to 3/4-16 with a die then the rod should be 3/4 inch (.750) in diameter.

If you are tapping a hole with a 3/4-16 tap then use the chart below.

Drill Chart
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Old 12-13-2006, 12:09 PM
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oh, i guess that was kind of a stupid question. I've never really threaded a rod before so *shrugs*. Thanks.

Ben
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Old 12-13-2006, 12:10 PM
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How did you know I needed one of those drill charts..

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Old 12-13-2006, 01:47 PM
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Watch out because some of that 3/4" rod can vary alot in it's actual size. I've seen 3/4" hot rolled round be .015" over. It gets really hard to thread when it is that much over. Messes up dies also.

Cold rolled round is usually closer, but it still winds up on the big side.

I try to take a dial caliper or micrometer to the steel yard with me and pick rod that is closer to what I need.

Otherwise I wind up turning it down in the lathe.

Later,
mikey
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Old 12-13-2006, 01:55 PM
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yeah, that is always the first thing I check is the diameter of the material. Thanks for the tips.
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