Vlier M51 Threaded Spring Plunger 8-36 Steel Stubby

Product Description

The VLIER M51 is a stubby threaded spring plunger designed for precision positioning, indexing, and light-duty detent applications in restricted-space assemblies. The steel body threads into an 8-36 tapped hole with a thread length of 0.437 inches. The plunger nose extends a maximum projection of 0.052 inches and measures 0.07 inches in diameter at its widest point. Initial end force is 0.5 pounds, building to a final end force of 1.5 pounds at full compression. Both the body and nose are constructed from steel, making this plunger suited for applications where durability and consistent spring force are required in tight spatial envelopes.

The M51 is intended for use in mechanical assemblies where panel space or bore depth limits the use of standard-length spring plungers. Typical applications include fixture tooling, jig assemblies, machine components, and precision instrument housings where a low-profile, threaded positioning element is needed. The stubby body length makes it especially practical in shallow-tapped housings or thin-wall components where a full-length plunger body would not fit. It is well suited for high end force requirements relative to its compact form factor.

Key Features

• Stubby body profile designed for restricted-space and shallow-tapped-hole installations
• 8-36 thread size with 0.437 inches thread length for secure mechanical engagement
• Steel body and steel nose for durability under repeated cycling
• 0.052 inches plunger projection provides positive detent action in a minimal footprint
• Initial end force of 0.5 pounds and final end force of 1.5 pounds for controlled indexing
• No locking element allows for straightforward installation and removal

Compatibility

Designed as an OEM-style replacement or direct-fit component for mechanical assemblies requiring an 8-36 threaded stubby spring plunger with steel construction.

Installation Notes

Installation is performed by threading the M51 into a properly tapped 8-36 hole using the appropriate hex key or driver. Ensure the mating bore is clean and free of debris before installation. Avoid overtightening, as excess torque can distort the body and affect spring performance. This type of component is typically installed by machinists, toolmakers, or mechanical technicians during assembly or maintenance operations.