Vlier SMPRTL12P Locking Knob Handle Plunger M12x1.75

Product Description

The VLIER SMPRTL12P is a locking knob handle plunger designed for precision indexing, positioning, and holding applications in industrial and mechanical assemblies. Built from stainless steel with a Delrin knob, this spring-loaded plunger features an M12x1.75 thread and a 25mm thread length, making it suitable for threaded housings and fixtures requiring reliable, repeatable engagement. The locking plunger mechanism delivers an initial end force of 0.56 pounds and a final end force of 1.8 pounds, allowing controlled resistance during indexing operations. The overall body length is 1.2 inches, and the maximum plunger diameter is 0.314 inches. Machinists, toolmakers, and mechanical assembly technicians install this type of component in jigs, fixtures, and positioning equipment.

The SMPRTL12P is used in industrial machinery, tooling fixtures, and mechanical positioning systems where a locking spring plunger is required to hold a component in place until deliberately released. The locking element prevents unintended plunger retraction under vibration or incidental contact. The Delrin knob provides a non-metallic grip surface for manual operation without tools. Applications include machine tool fixtures, assembly jigs, rotary tables, and any mechanical system that requires indexed positioning with a manual lock-release function.

Key Features

• Locking plunger mechanism with a positive locking element to prevent unintended retraction
• M12x1.75 thread size with 25mm thread length for direct installation into threaded housings
• Stainless steel body construction for corrosion resistance in demanding environments
• Delrin knob provides a manual, tool-free locking and release interface
• Initial end force of 0.56 pounds and final end force of 1.8 pounds for controlled indexing engagement
• Plunger projection of 0.236 inches with a maximum plunger diameter of 0.314 inches

Compatibility

Designed as a standard metric locking knob handle plunger for threaded housings using M12x1.75 thread, suitable for industrial jigs, fixtures, and mechanical positioning assemblies that accept this thread size and body format.

Installation Notes

Installation is performed by threading the body directly into a pre-tapped M12x1.75 hole using the 0.472-inch hex on the body for torque application. Ensure the mating housing material and thread depth are compatible with the 25mm thread length before installation. Disengage any adjacent mechanical loads before servicing or replacing the plunger. Follow applicable machinery safety standards and lock out equipment power before performing installation or maintenance on live assemblies.