Jergens 31421 Flat Vent Pull Out Dowel Pin 3/8x2 in Alloy Steel

Product Description

The JERGENS 31421 is a flat vent pull out dowel pin designed for precision locating and alignment applications in industrial and mechanical assemblies. Manufactured from C-1215 alloy steel, this threaded-end pin measures 3/8 inch in diameter and 2 inches in overall length, with a diameter tolerance held to -0.0001 to 0.0001 inches for tight, repeatable fits. The flat vent groove aids in press-fit installation by allowing trapped air and lubricant to escape, preventing hydraulic lock in blind holes. Machinists, tool and die makers, and maintenance technicians install these pins in fixtures, jigs, and machine components where precise part registration is required.

This pin is suited for use in production fixtures, machining jigs, and assembly tooling across manufacturing environments. The threaded end allows for controlled extraction using a standard pull-out tool, making it practical in applications where the pin must be removed without damaging the mating bore or surrounding component. The ASME B18.8.2 standard governs its dimensional and tolerance requirements, making it a direct fit where that standard is specified in engineering drawings.

Key Features

• Flat vent design allows air and lubricant relief during press-fit installation, preventing hydraulic lock in blind holes
• Threaded end enables controlled extraction with a pull-out tool without bore damage
• C-1215 alloy steel construction provides strength suitable for precision tooling applications
• Diameter tolerance of -0.0001 to 0.0001 inches ensures tight, repeatable locating fits
• Conforms to ASME B18.8.2 fastener standard for dimensional compliance

Compatibility

Designed as an OEM-style replacement or standard component for fixtures, jigs, and mechanical assemblies requiring a 3/8 inch flat vent pull out dowel pin per ASME B18.8.2.

Installation Notes

Installation is typically performed by machinists or maintenance technicians using an arbor press or mallet with an appropriate driver. Ensure the mating bore is clean, deburred, and dimensionally verified before pressing the pin into position. Always use a proper pull-out tool threaded onto the extraction end for removal - do not attempt to drive the pin out from the opposite end in blind-hole applications. Follow applicable facility safety and lockout/tagout procedures when servicing equipment containing these pins.