Tap End Stud — Cast Iron & Aluminum Housings
A tap end stud has an interference (Class 5) fit on one end designed to be permanently installed in a cast iron or aluminum tapped hole, with a standard (Class 2A or 6g) thread on the nut end. Once installed, only the nut is removed for assembly access — preserving the relatively soft parent thread.
Specifications
| Tap End Length | 1d (steel), 1.25d (cast iron), 2d (aluminum) — per parent material |
|---|---|
| Standards | DIN 938, DIN 939, DIN 835, ASME B18.31.2 |
| Diameter Range | M5 – M30 |
| Application | Engine blocks, pump housings, valve bodies |
Frequently Asked Questions
Why does aluminum require a longer tap engagement?
Aluminum has lower shear strength than steel or cast iron, so more thread engagement is needed to develop equivalent pullout strength. Standard practice is 2 × diameter engagement in aluminum, vs 1 × diameter in steel and 1.25 × diameter in cast iron.
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