Vlier SL500 Knob Handle Spring Plunger 1/2-13 Thread

Product Description

The VLIER SL500 is a knob handle spring plunger designed for indexing, positioning, and locating applications in industrial and mechanical assemblies. It features a 1/2-13 thread size with a thread length of 0.875 inches and a non-locking plunger type. The knurled knob provides manual actuation without tools. The plunger delivers an initial end force of 1 pound and a final end force of 10 pounds, making it suitable for moderate-resistance positioning tasks. Body length measures 1.13 inches. The steel construction with a zinc gold chromate finish provides corrosion resistance in light industrial environments. Machinists, tool and die technicians, and mechanical assemblers typically install this type of component.

The SL500 is used in jigs, fixtures, machine tool assemblies, and production tooling where repeatable plunger-actuated positioning is required. The knurled knob allows hand-actuation for frequent indexing cycles without requiring a wrench or driver. The 0.248-inch maximum plunger diameter and 0.25-inch plunger projection make it suited for light-duty detent and positioning work in compact assemblies. It installs into a tapped 1/2-13 hole with 0.875 inches of usable thread engagement.

Key Features

• Non-locking plunger type for free-motion indexing and detent applications
• Knurled knob handle allows tool-free manual actuation
• Initial end force of 1 pound, final end force of 10 pounds for controlled resistance
• Steel body with zinc gold chromate finish for corrosion resistance
• Maximum plunger diameter of 0.248 inches with a tolerance of +0.001 / -0.000 inches
• Plunger projection of 0.25 inches and plunger length of 1.5 inches

Compatibility

Designed for installation into standard 1/2-13 tapped holes in jigs, fixtures, and machine tool assemblies requiring a non-locking knob-actuated spring plunger.

Installation Notes

Installation is performed by threading the SL500 into a pre-tapped 1/2-13 hole to the appropriate engagement depth. De-energize and lock out any powered equipment before servicing assemblies containing this component. Use a torque approach appropriate to the receiving material to avoid thread damage - do not over-drive the body. Ensure the plunger bore is clean and free of debris before assembly to avoid interference with plunger travel.