Stud Bolt, Double End (DIN 939 / DIN 938)
A double-end stud has threaded ends with a smooth midsection. One end (the 'tap end' or 'interference end') is permanently screwed into a tapped hole; the other end accepts a nut. Common in cast iron and aluminum housings where repeated bolt engagement would damage the parent thread.
Specifications
| Standards | DIN 938 (1d tap end), DIN 939 (1.25d tap end), DIN 835 (2d tap end) |
|---|---|
| Diameter Range | M5 – M48 |
| Material | Carbon steel, Stainless 304/316 |
| Surface Finish | Plain, Zinc plated, HDG |
Frequently Asked Questions
Why use a double-end stud instead of a hex bolt?
In castings (engine blocks, pump housings), repeated bolt removal damages the relatively soft parent thread. Installing a stud once and then removing only the nut preserves the parent thread. Studs also provide a more accurate clamping line in flange applications.
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