Vlier S58 Threaded Spring Plunger 3/8-16 Steel

Product Description

The VLIER S58 is a standard threaded spring plunger designed to provide controlled, repeatable end force in positioning, indexing, and locating applications. The plunger body is machined steel with a 3/8-16 thread size and a thread length of 1-1/8 inches. The plunger nose is also steel, with a minimum diameter of 0.186 inches and a maximum diameter of 0.187 inches. It delivers an initial end force of 5.5 pounds and a final end force of 14.5 pounds, with a projection of 3/16 inches. This part is installed by machinists, toolmakers, and mechanical assemblers working with fixtures, jigs, and precision assemblies.

The S58 is suited for use in industrial and manufacturing environments where a reliable spring-loaded plunger is needed for part registration, detent positioning, or light-duty locking without a dedicated locking element. The standard plunger length type makes it appropriate for general-purpose threaded bore installations in metal fixtures, machine components, and assembly tooling where repeatable spring force is required.

Key Features

• 3/8-16 thread size with 1-1/8 inch thread length for broad fitment in standard tapped bores
• 5.5 lb initial end force and 14.5 lb final end force for light-to-moderate positioning duty
• Steel body and steel nose for durability in industrial environments
• Plunger diameter range of 0.186 to 0.187 inches for consistent, precise engagement
• 3/16 inch plunger projection suits shallow-detent and registration applications
• No locking element - straightforward installation and removal without secondary retention

Compatibility

Designed as a standard OEM-style threaded spring plunger for use in any application requiring a 3/8-16 threaded bore with a 1-1/8 inch body length.

Installation Notes

Install using a hex key or spanner wrench appropriate for the plunger body style - do not overtighten, as this can restrict plunger travel or damage the spring. Thread the plunger into a clean, properly tapped 3/8-16 bore and verify full, unobstructed plunger projection before final assembly. De-energize or lock out any associated equipment before servicing plungers installed in active machinery per applicable OSHA lockout/tagout procedures.