Vlier SSMD61 Threaded Spring Plunger 1/2-13 Stainless Steel

Product Description

The VLIER SSMD61 is a stubby threaded spring plunger designed for indexed positioning, detent, and light-duty locating applications in industrial machinery and fixtures. The body is stainless steel with a 1/2-13 thread, a body length of 0.75 inches, and a maximum plunger diameter of 0.248 inches. The nose is Delrin, which provides low-friction contact against mating surfaces and reduces wear. The plunger delivers an initial end force of 1.75 pounds and a final end force of 5.5 pounds, making it suited for applications requiring repeatable, light spring resistance. Millwrights, toolmakers, and machine technicians install this type of component in jigs, fixtures, and automated equipment.

The SSMD61 is intended for use in threaded through-holes or blind holes tapped to 1/2-13. The stubby plunger profile keeps the installed height low, which is useful in tight-clearance fixture plates and slide assemblies. It is a common choice in repetitive-cycle applications where a consistent detent force is needed without a locking element. The stainless steel body suits environments where corrosion resistance is a factor, such as washdown areas or humid production floors.

Key Features

• Stainless steel body resists corrosion in demanding shop and washdown environments
• Delrin nose provides low-friction, low-wear contact on mating surfaces
• Stubby plunger profile reduces installed height for tight-clearance applications
• 1/2-13 thread fits standard tapped holes in fixture plates and machine components
• 1.75-pound initial end force and 5.5-pound final end force for repeatable light detent
• No locking element - allows straightforward installation and removal by hand or wrench

Compatibility

Designed as an OEM-style replacement or new-installation spring plunger for threaded holes tapped to 1/2-13 in industrial fixtures, jigs, and positioning assemblies.

Installation Notes

Install and remove using a hex key or wrench appropriate to the plunger body flats - avoid over-torquing the stainless steel body into aluminum or cast-iron tapped holes. Ensure the mating threaded hole is clean and free of chips or debris before installation. No power lockout is required for spring plunger replacement in fixtures, but the machine or assembly should be in a safe, de-energized state before servicing indexed positioning components. Apply thread sealant only if specified by the fixture design, as it may affect removal torque.