- 1/4 npt internal thread
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1/4 npt internal thread
Hi, I have a 1/2 npt and 1/4 npt internal threads I have to machine (screw cut) on a fanuc lathe, can't tap as in very hard steel. I have a 08 14 NPT insert and 06 18 NPT for the 1/4 thread. Problem is I know it's a 1/16 taper but don't know the start dia or the thread length or what size to bore the taper. Do have a engineers hand book that's only any good for the tapping drill size for both these threads, any help would be great.
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Also I have step gauges and program in metric using a G76 for the thread
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Is this what you are looking for?
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Have seen this chart yes Thanks
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Is the problem in that you do not know how to read the information off of the charts?
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Yep found it hard to make sence of the chart, I have the job on the machine and need to crack on in the morning. Was just looking for a quick easy way out to get the figures and complete the job
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For 1/4-18 - Starting Diameter is 0.49163.
For 1/2-14 - Starting Diameter is 0.77843.
Does that help?
- 1/4 npt internal thread
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