Vlier SLR375 Locking Knob Plunger 3/8-16 Steel

Product Description

The VLIER SLR375 is a locking knob handle plunger designed for precision positioning and indexing applications in industrial and mechanical assemblies. Built from steel with a zinc gold chromate finish, this spring-loaded plunger features a countersunk knob style and delivers an initial end force of 1 pound ramping to a final end force of 8 pounds. The 3/8-16 threaded body installs into tapped holes and provides a maximum plunger diameter of 0.185 inches with a plunger projection of 0.22 inches. The locking plunger type holds position under vibration or repeated cycling, making it reliable in demanding mechanical environments where inadvertent plunger movement is a concern.

The SLR375 is suited for use in jigs, fixtures, machine tool components, and industrial equipment requiring positive detent or locking retention. It installs in any assembly where a 3/8-16 threaded mounting hole is available. The compact body length of 1.26 inches makes it appropriate for space-constrained panel or frame installations. Maintenance technicians and machine builders working on production tooling, automation equipment, and industrial enclosures are the primary installers of this component.

Key Features

• Locking plunger type holds position and resists inadvertent retraction
• Countersunk knob style for low-profile, flush-friendly installation
• 3/8-16 thread size with 0.75 inch thread length for standard tapped-hole compatibility
• Steel construction with zinc gold chromate finish for corrosion resistance
• Initial end force of 1 pound to final end force of 8 pounds for controlled engagement
• Head diameter of 1 inch and hex size of 0.2188 inches for standard wrench installation

Compatibility

Designed as an OEM-style replacement or new-installation plunger for industrial assemblies, jigs, and fixtures that accept a 3/8-16 threaded spring plunger with a locking knob handle.

Installation Notes

Installation is performed by machine builders or maintenance technicians using a standard wrench on the 7/32 hex. Thread the plunger into a pre-tapped 3/8-16 hole and tighten to the assembly specification. Ensure the mounting surface is clean and free of debris before threading in. Disengage or de-energize any moving machinery before servicing or replacing plunger components.