80 threads per inch fastener close-up.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
Previously:
NASA fastener design manual
Thread rolling machine - GIF
Bolt threading GIF
80 threads per inch fastener close-up.
Fullsize image: https://diqn32j8nouaz.cloudfront.net...r_fullsize.jpg
Previously:
NASA fastener design manual
Thread rolling machine - GIF
Bolt threading GIF
New plans added on 12/13/2024: Click here for 2,629 plans for homemade tools.
1/4"-80 is not uncommon as micro adjusters in lab gear for optics and/ or high vacuum conditions.
Tutorial for the curious: Fine Adjustment Screws
Last edited by DIYSwede; Jul 4, 2019 at 11:33 PM. Reason: added link
12bolts (Jul 5, 2019), baja (Jul 5, 2019), jimfols (Jul 5, 2019), Paul Jones (Jul 7, 2019)
-Good luck!
AFAIK, a single-point 112 TPI threading tool would need a 1,29 thou (32,7 microns) tip radius and a 5,48 thou (0,139 mm) DOC,
but merely choosing the right tool alloy to make that tip strong enough for 303 SS is beyond my knowledge horizon.
Then, DIY-ing a tool grinder for that geometry and checking its precision would be quite an undertaking...
Then making a durable tap is a whole different job.
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