Spi 35918 Test Indicator Stylus for F/98-399

Product Description

The SPI 35918 is a replacement stylus designed for use with the F/98-399 test indicator. The stylus is the contact point that transfers surface variation to the indicator mechanism, making direct contact with the workpiece during measurement. Machinists, tool and die technicians, and quality control professionals install this accessory when the original stylus shows wear or damage that compromises measurement accuracy. At 0.02 pounds, the part is lightweight and precision-fitted to the indicator it supports.

This stylus is intended for use in machine shops, manufacturing facilities, and toolrooms where the F/98-399 test indicator is part of the standard metrology setup. It is used during setup, inspection, and in-process measurement tasks on mills, lathes, surface plates, and similar equipment where precise runout, alignment, or surface deviation readings are required.

Key Features

• Direct replacement stylus engineered to fit the F/98-399 test indicator
• Lightweight at 0.02 pounds for minimal added mass at the contact point
• Single-unit packaging allows replacement of just the worn or damaged stylus without replacing the full indicator
• Accessory-type fitment ensures compatibility with the intended indicator model

Compatibility

Designed for use with the SPI F/98-399 test indicator as stated by the manufacturer.

Installation Notes

Installation is typically performed by a machinist or metrology technician. Before replacing the stylus, remove the indicator from any active setup and ensure the contact arm is in a relaxed, non-loaded position. Follow the indicator manufacturer's procedure for stylus removal and seating to avoid damaging the contact arm or the pivot mechanism. Verify the stylus is fully seated and secure before returning the indicator to service.