Stud Bolt with Reduced Shank (DIN 2510 / DIN 2509)
Reduced-shank studs have a smooth middle section machined down below the thread root diameter. The reduced cross-section allows the stud to elastically stretch under preload, providing more consistent gasket clamping and improved fatigue resistance — important in cycling pressure or thermal service.
Specifications
| Standards | DIN 2509 (waist 0.9d), DIN 2510 (waist 0.85d) |
|---|---|
| Application | High-pressure flanges, steam turbines, pressure vessels |
| Material | Alloy steel (B7, B16, L7), Stainless |
| Documentation | MTC 3.1 standard |
Frequently Asked Questions
Why does a reduced-shank stud improve flange performance?
Under preload, the stud stretches elastically. A reduced shank stretches more for a given torque (because the cross-section is smaller), which means the stud stores more elastic energy. As the gasket creeps or relaxes, this stored energy maintains clamp load far longer than a full-cross-section stud would.
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