Vlier SBM8N Threaded Ball Plunger M8 X 1.25 Stainless Steel

Product Description

The VLIER SBM8N is a threaded ball plunger designed for indexing, positioning, and light retention applications in mechanical assemblies. It features an M8 x 1.25 thread, a stainless steel body, and a stainless steel ball measuring 0.196 inches in diameter. The ball extends a maximum of 0.059 inches beyond the body face and delivers an initial end force of 3.37 pounds and a final end force of 6.75 pounds. A locking element is included to secure the plunger in the threaded bore after installation. The body length is 0.63 inches. This plunger is installed by machinists, maintenance technicians, and mechanical assemblers working on fixtures, tooling, and precision equipment.

The SBM8N is suited for use in industrial machinery, fixtures, jigs, and automated equipment where repeatable ball-detent positioning is required. The stainless steel construction makes it appropriate for environments with exposure to moisture, cutting fluids, or mild corrosives. It is commonly installed in bores machined to M8 x 1.25 thread specifications and is identified by a purple color code for quick field identification during assembly or maintenance.

Key Features

• M8 x 1.25 thread for direct installation into a matching threaded bore
• Stainless steel body and stainless steel ball for corrosion resistance
• 0.196 inch ball diameter with 0.059 inch maximum ball reach
• Initial end force of 3.37 pounds and final end force of 6.75 pounds for controlled detent resistance
• Locking element included to prevent loosening after installation
• Purple color code for fast identification during assembly

Compatibility

Designed for installation in any threaded bore machined to M8 x 1.25 specifications where a ball-detent plunger with a locking element is required.

Installation Notes

Installation is performed by machinists or mechanical assemblers using a hex key or spanner wrench suited to the plunger body. The mating bore must be threaded to M8 x 1.25 before installation. Engage the locking element per the manufacturer procedure to prevent the plunger from backing out under vibration or repeated cycling. Do not overtighten, as this can distort the body or impair ball travel.