Vlier SSS57 Threaded Spring Plunger 5/16-18 Stainless

Product Description

The VLIER SSS57 is a threaded spring plunger designed for precise positioning, indexing, and detent applications in mechanical assemblies. The body and nose are both stainless steel, making this plunger suitable for corrosive or washdown environments. It uses a 5/16-18 thread with a 1-inch thread length and delivers an initial end force of 1.5 pounds and a final end force of 4.5 pounds. The plunger projection is 3/16 inch with a maximum plunger diameter of 0.135 inches. Machinists, toolmakers, and mechanical assembly technicians install this type of component in fixtures, jigs, and production equipment.

The SSS57 fits applications where a compact, threaded detent or locating element is needed in a tapped hole. Typical installations include machine tool fixtures, assembly jigs, and any mechanism requiring repeatable part positioning or light-duty indexing. The stainless steel construction extends service life in environments where carbon steel would corrode. This is a standard-length plunger without a locking element, suited for installations where the plunger must remain adjustable after installation.

Key Features

• Stainless steel body and nose for corrosion resistance in washdown or humid environments
• 5/16-18 thread with 1-inch thread length for secure engagement in standard tapped holes
• 1.5-pound initial end force and 4.5-pound final end force for light-duty detent and indexing
• 3/16-inch plunger projection with a maximum plunger diameter of 0.135 inches
• No locking element, allowing for post-installation depth adjustment
• Standard-length body at 1 inch suits common fixture and jig applications

Compatibility

Designed as an OEM-style replacement or direct-install threaded spring plunger for standard 5/16-18 tapped holes in mechanical fixtures, jigs, and assembly tooling.

Installation Notes

Threaded spring plungers are typically installed by machinists or mechanical assemblers using a hex key or spanner tool rated for the thread size. Ensure the tapped hole is clean and free of debris before installation. Do not overtighten, as excessive torque can damage the spring mechanism or distort the stainless steel body. Verify plunger projection depth and end force requirements before finalizing installation position.