M12 x 20 Alloy Steel Metric Socket Head Shoulder Screw (Stripper Bolt) is named by its 12 mm shoulder, not by its M10-1.5 threaded end. The shoulder rides in the assembly while the threaded end anchors below it, so both diameters must match the print.

Stamping die sets and stripper plates use these metric stripper bolts as guided travel posts against springs. 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. ISO 7379 catalog nominals often list 13 mm here; this hard-to-find 12 mm shoulder is a stocked variant used in North American metric tooling. Special metric shoulder screw requests can be quoted when the shoulder diameter, length, or thread pairing falls outside the catalog row. Inch-series Alloy Steel Socket Head Stripper Bolts are the related family when the print is not metric.

Technical Highlights

• Style: Socket head shoulder screw (stripper bolt), internal hex drive
• Material: Alloy Steel
• Shoulder Diameter: 12 mm nominal (11.984 / 11.941 mm)
• Shoulder Length: 20 mm
• Thread: M10-1.5 (one size below the shoulder, per ISO 7379)
• Thread Length: 16.40 mm
• Head Diameter: 18.00 / 17.73 mm (max/min)
• Head Height: 8.00 / 7.78 mm (max/min)
• Hex Key Size: 6 mm
• Minimum Key Engagement: 4.9 mm
• Dimensional Standard: ISO 7379

Call 773-775-7900 or email Sales@coldheaders.com for pricing, availability, or a quote.