Vlier PFBK54 Press-fit Ball Plunger 0.254 in Steel

Product Description

The VLIER PFBK54 is a press-fit ball plunger designed for precision positioning, indexing, and light-duty detent applications in mechanical assemblies. The steel body measures 0.254 inches in diameter and 0.52 inches in length, with a stainless steel ball measuring 0.188 inches in diameter. A black oxide finish provides corrosion resistance in low-moisture environments. Installation requires no threading - the body presses directly into a prepared bore, making it well suited for high-volume assembly and fixtures where flush, tool-free integration is required. Machinists, toolmakers, and mechanical assembly technicians are the primary installers of this component.

The PFBK54 is used in jigs, fixtures, tooling plates, and mechanical assemblies where repeatable positioning or light tactile detent action is needed. It is appropriate for applications requiring a compact, low-profile plunger without a flange or locking element. The stainless steel ball resists wear and corrosion in contact zones, making it suitable for both production tooling and general industrial assembly environments.

Key Features

• Press-fit body installs into a drilled bore without threading or external hardware
• 0.254 inch body diameter with a dimensional tolerance of plus or minus 0.010 inches
• Stainless steel ball with 0.070 inch maximum ball reach for controlled detent travel
• Initial end force of 3.00 pounds; final end force of 7.00 pounds for defined resistance feedback
• Black oxide finish on steel body for moderate corrosion and wear resistance
• No flange, no locking element - minimal footprint in tight assemblies

Compatibility

Designed as an OEM-style or aftermarket replacement press-fit ball plunger for mechanical jigs, fixtures, and tooling assemblies requiring a 0.254 inch bore diameter and compact detent action.

Installation Notes

Press-fit installation requires a precisely drilled or reamed bore to match the 0.254 inch body diameter within the stated tolerance. Use an arbor press or similar controlled-force tool to seat the plunger body flush - do not strike with a hammer, as this can deform the body or damage the ball mechanism. Verify bore depth against the 0.52 inch body length before pressing to ensure proper seating. Removal after press-fit installation may not be possible without damage to the bore or the component.