Gibraltar STPR50-PT-G Locking Pull Ring Plunger 1/2-13

Product Description

The GIBRALTAR STPR50-PT-G is a steel locking pull ring plunger designed for indexing, positioning, and locking applications in industrial and mechanical assemblies. It features a 1/2-13 thread with a thread length of 1.4 inches, a plunger diameter of 0.312 inches, and a plunger projection of 0.5 inches. The locking element holds the plunger in the retracted position, preventing unintended extension during operation. End force ranges from 2.5 pounds initial to 5 pounds final, providing consistent, repeatable holding force. This plunger is installed by maintenance technicians and machine builders working on fixtures, jigs, and positioning assemblies.

The STPR50-PT-G is suited for light-duty industrial positioning tasks where a manually retractable, lockable plunger is needed. Typical installations include machine frames, tooling plates, fixture boards, and panel assemblies requiring a positive-stop or index point. The pull ring allows the operator to retract the plunger by hand without tools. This part is sold individually and is appropriate for both original equipment builds and field replacement applications.

Key Features

• Locking pull ring retracts and holds plunger in disengaged position
• 1/2-13 thread for standard tapped-hole installation
• End force range: 2.5 pounds initial to 5 pounds final for repeatable indexing force
• Steel construction for durability in industrial environments
• Compact body length of 2 inches suitable for space-constrained assemblies
• Plunger diameter of 0.312 inches fits standard indexing receiver bores

Compatibility

Designed as an OEM-style replacement or new-build component for industrial fixtures, jigs, and positioning assemblies requiring a 1/2-13 threaded locking pull ring plunger.

Installation Notes

Installation requires a tapped 1/2-13 hole in the mounting body; verify thread depth accommodates the 1.4-inch thread length before installation. Secure the plunger body with appropriate tooling and confirm the locking element engages and releases freely before putting the assembly into service. Always de-energize or mechanically isolate the host machine before servicing plunger hardware in automated fixtures.