![]() I just need guidance for this since it will be my first time using roll taps. ![]() Regardless I have to know the percent thread engagement so I know what size to drill the hole for the form taps. I know hole size is critical for roll taps, so my question is what percent thread engagement should I shoot for when tapping 316 Stainless in general? is 75% engagement too high? FYI Our customer typically does not call out thread class on their drawings. I read that the strength difference between 75% thread engagement and 100% is only 5% but it takes 3 times more torque to tap a hole with 100% thread engagement than 75% thread engagement. I read that online somewhere but can't remember where. If I remember correctly, I think your standard tap drill size from a chart allows for 75% thread engagement. When we use cut taps, I just follow the tap drill recommendation on the drill chart on the wall in our shop. I bought some emuge innoform roll taps specifically for 316 Stainless in 1/4-28 and 5/16-18 sizes to test out in a scrap block of 316 stainless to see if it would pay off to use these taps for a production job. ![]() ![]() I would like to get into thread forming with form taps since there are no chips produced and it's easier to tap a blind hole, plus the threads are stronger. We mostly use emuge cut taps and carmex thread mills to create female threads. Out of those, we do 316 stainless the most. At our shop, the majority of the work we do is on 316 stainless steel, inconel, and titanium 6Al4v. ![]()
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