Vlier SM8A Threaded Spring Plunger M8 X 1.25 Steel

Product Description

The VLIER SM8A is a standard threaded spring plunger with an M8 x 1.25 thread size and a steel body. It is designed to provide controlled positioning, indexing, or light-duty retention in assemblies where a spring-loaded ball or nose must engage a detent, hole, or groove. The plunger nose and body are both steel construction, offering durability in industrial and mechanical applications. Initial end force is 5.62 pounds and final end force is 15.74 pounds, making it suitable for light to moderate load positioning tasks. Machinists, tool and die makers, and mechanical assembly technicians are the primary installers of this type of hardware.

The SM8A installs into any tapped M8 x 1.25 hole and is suited for jigs, fixtures, tooling plates, machine frames, and similar assemblies where repeatable detent positioning is required. The standard plunger length type makes it appropriate for general-purpose installations where a low-profile projection is acceptable. This part ships individually and is sold as a single unit, making it convenient for prototyping, repair, or low-volume production work.

Key Features

• M8 x 1.25 thread size for direct installation into standard metric tapped holes
• 0.866 inches thread length provides solid engagement depth
• Steel nose and body construction for wear resistance in industrial environments
• 5.62 pounds initial end force and 15.74 pounds final end force for light-duty detent applications
• 0.138 inches maximum plunger diameter with 0.118 inches projection at full extension
• No locking element - standard free-turning installation

Compatibility

Designed as a direct-fit threaded spring plunger for any assembly with a tapped M8 x 1.25 hole requiring standard spring-loaded nose positioning or indexing.

Installation Notes

Install using standard hex or slotted drive tooling appropriate for the plunger head style. De-energize and de-pressurize any assembly before servicing components in the work area. Verify thread engagement depth against the 0.866 inches thread length before installation to ensure full seating. Do not exceed the rated final end force to avoid damaging the spring mechanism or the mating detent surface.