M20 x 25 Alloy Steel Metric Socket Head Shoulder Screw (Stripper Bolt) is specified when the drawing calls for a controlled shoulder diameter and a one-size-smaller thread. The shoulder rides in the assembly while the threaded end anchors below it, so both diameters must match the print.
Sliding fixture plates and inspection tooling can use the shoulder as a repeatable bearing and location surface. Check shoulder diameter, shoulder length, thread size, thread length, socket size, and head dimensions before substitution.
Cold Headers has supplied specialty socket fasteners since 1962 and supports exact metric shoulder-screw identification. Inch-series Alloy Steel Socket Head Stripper Bolts are the related family when the print is not metric. 316 or other special-material metric shoulder screws are non-catalog quote requests when the print requires that material.
Technical Highlights
- Style: Socket head shoulder screw (stripper bolt), internal hex drive
- Material: Alloy Steel
- Shoulder Diameter: 20 mm nominal (19.98 / 19.928 mm)
- Shoulder Length: 25 mm
- Thread: M16-2.0 (one size below the shoulder, per ISO 7379)
- Thread Length: 22.40 mm
- Head Diameter: 30.00 / 29.67 mm (max/min)
- Head Height: 14.00 / 13.73 mm (max/min)
- Hex Key Size: 10 mm
- Minimum Key Engagement: 8.8 mm
- Dimensional Standard: ISO 7379
Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.
