Vlier SPR250P Locking Pull Ring Plunger 1/4-20 Ss

Product Description

The VLIER SPR250P is a stainless steel locking pull ring plunger threaded at 1/4-20 with a 0.8 inch thread length. It is designed for positional locking and indexing applications where a retractable, spring-loaded plunger must hold a position under load and release only when deliberately pulled. The plunger diameter is 0.155 inches, plunger projection is 0.25 inches, and end force ranges from 1 pound initial to 2.5 pounds final. Machinists, toolmakers, maintenance technicians, and equipment assemblers install this type of hardware in jigs, fixtures, panels, and mechanical assemblies requiring repeatable positioning.

This plunger is used in light-duty industrial and mechanical applications where controlled locking and positive retention are required. Common install scenarios include fixture plates, indexing jigs, drawer assemblies, enclosure panels, and equipment housings. The pull ring mechanism allows the operator to retract the plunger by hand without additional tooling, making it suitable for frequent adjustment cycles. It fits residential and commercial equipment assemblies where a threaded body plunger with a locking element is specified.

Key Features

• Locking pull ring design - plunger retracts only when ring is manually pulled, preventing accidental disengagement
• 1/4-20 thread with 0.8 inch thread length for standard tapped hole installation
• Stainless steel construction for corrosion resistance in demanding service environments
• End force rated from 1 pound initial to 2.5 pounds final for light-duty positioning loads
• Compact body length of 1.14 inches suits space-constrained assemblies
• Integrated locking element provides positive retention until intentionally released

Compatibility

Designed as an OEM-style replacement or direct install component for mechanical assemblies, fixtures, and equipment panels requiring a 1/4-20 threaded locking spring plunger with a pull ring release.

Installation Notes

Installation is performed by threading the plunger body into a tapped 1/4-20 hole to the specified thread engagement depth. De-energize or lock out any equipment before servicing assemblies that incorporate this plunger. A hex wrench or appropriate driver applied to the head is typically used for final torque; follow the equipment manufacturer's fastener specifications. Do not over-tighten, as this may damage the locking element or restrict plunger travel.