Vlier SSS56 Threaded Spring Plunger 5/16-18 Stainless Steel

Product Description

The VLIER SSS56 is a threaded spring plunger designed for use in positioning, indexing, and locking applications where repeatable, controlled resistance is required. Built with a stainless steel body and stainless steel nose, this plunger delivers an initial end force of 3 pounds and a final end force of 15 pounds. The 5/16-18 thread and 1-inch thread length allow direct installation into a tapped bore, making it a straightforward component for machine tool fixtures, jigs, and assembly equipment. The standard-length plunger projects 3/16 inches when fully extended, with a maximum plunger diameter of 0.135 inches.

This spring plunger is suited for light-duty mechanical positioning tasks in manufacturing, tooling, and industrial assembly environments. It is commonly specified by machine builders, toolmakers, and maintenance technicians who need a compact, corrosion-resistant detent mechanism. The stainless steel construction makes it appropriate for applications where mild corrosion resistance or cleanability is a requirement, such as food processing adjacent equipment or washdown-tolerant fixtures.

Key Features

• 5/16-18 thread with 1-inch thread length for installation in standard tapped bores
• Stainless steel body and nose for corrosion resistance and durability
• 3-pound initial end force and 15-pound final end force for controlled detent action
• 0.135-inch maximum plunger diameter with 3/16-inch projection
• Standard plunger length type for common fixture and jig applications
• No locking element - free-turning installation for straightforward positioning use

Compatibility

Designed as an OEM-style replacement or drop-in component for standard 5/16-18 tapped-bore applications requiring a threaded spring plunger with a stainless steel body.

Installation Notes

Installation is typically performed by a machinist or maintenance technician using a hex key or spanner appropriate for the plunger style. The receiving bore should be tapped to 5/16-18 and free of debris before threading in the plunger. Apply thread-locking compound only if specified by the fixture design, as it may interfere with future serviceability. Power down or de-energize any associated equipment before servicing components in the fixture or assembly.