Jergens 31404 Flat Vent Pull Out Dowel Pin 1/4 X 1-1/2 in

Product Description

The JERGENS 31404 is a flat vent pull out dowel pin manufactured from C-1215 alloy steel to ASME B18.8.2 standards. It measures 0.25 inches in diameter and 1.5 inches in overall length, with a threaded end for pull-out extraction. The flat vent design allows trapped air to escape during press-fit installation, reducing hydraulic resistance in blind holes. The diameter is held to a tolerance of -0.0001 to 0.0001 inches, making it suitable for precision fixturing and close-tolerance alignment work. Machinists, tool and die makers, and fixture builders are the primary installers of this component.

This dowel pin is used in tooling plates, jigs, fixtures, and machine components where repeatable part alignment is required. The threaded end provides a positive extraction point, eliminating the need to drive the pin out from the blind end and reducing the risk of damage to the mating bore. It is appropriate for both production tooling and maintenance repair applications in machine shops and manufacturing environments.

Key Features

• Flat vent channel reduces hydraulic lock during press-fit installation in blind holes
• Threaded end allows controlled extraction without bore damage
• C-1215 alloy steel construction for strength and machinability
• Diameter tolerance of -0.0001 to 0.0001 inches for precision alignment
• Meets ASME B18.8.2 fastener standard

Compatibility

Designed as an OEM-style replacement or standard component for tooling plates, jigs, and fixtures requiring a 0.25 inch diameter pull-out dowel pin per ASME B18.8.2.

Installation Notes

Installation is typically performed by machinists or toolmakers using an arbor press or hydraulic press. The mating bore should be reamed to the appropriate tolerance class before installation. Always verify bore depth and vent channel clearance before pressing to full depth. Follow applicable shop safety procedures and wear appropriate eye protection when pressing components.