Vlier BL54N Threaded Ball Plunger 1/4-20 Steel Locking

Product Description

The VLIER BL54N is a threaded ball plunger designed for controlled end-force applications in precision mechanical assemblies. It features a 1/4-20 thread size, a steel body, and a steel ball measuring 0.125 inches in diameter. The body length is 0.531 inches, and the maximum ball reach is 0.035 inches. Initial end force is 2 pounds, with a final end force of 4 pounds. A built-in locking element secures the assembly after installation. Identified by a purple color code, this is one of the smallest and lightest spring-loaded devices in the VLIER lineup, making it suited for tight-space applications where repeatable, low-force positioning is required.

The BL54N is used in applications requiring controlled, repeatable detent or positioning force in mechanical assemblies. Typical uses include fixture tooling, jigs, latching mechanisms, and positioning devices found in industrial equipment, machine tooling, and precision manufacturing. The 1/4-20 thread allows installation into standard tapped holes. This part is installed by mechanical assemblers, tool and die technicians, and maintenance professionals working in manufacturing and industrial environments.

Key Features

• 1/4-20 thread size for installation into standard tapped holes
• Steel body and steel ball for durability in industrial environments
• 2-pound initial end force and 4-pound final end force for controlled, repeatable positioning
• Maximum ball reach of 0.035 inches for precise detent engagement
• Built-in locking element to secure plunger position after adjustment
• Compact 0.531-inch body length suited for tight-clearance assemblies

Compatibility

Designed as an OEM-style replacement or direct-fit component for mechanical assemblies requiring a 1/4-20 threaded ball plunger with controlled end force and a locking element.

Installation Notes

Installation is performed by threading the BL54N into a pre-tapped 1/4-20 hole using an appropriate wrench or driver. Disengage and de-energize any powered or pressurized equipment before servicing the assembly. Do not overtighten, as excessive torque can damage the locking element or distort the body. Verify ball reach and end force are appropriate for the detent application before final assembly.