Spi 21-806-5 Deep Groove Stylus Surface Roughness Gage

Product Description

The SPI 21-806-5 is a deep groove stylus accessory designed for use with the SPI SRG-4600 surface roughness gage. The stylus contacts the workpiece surface and traces micro-level irregularities, allowing the gage to measure and report surface finish values. Deep groove geometry enables the tip to reach into narrow channels, keyways, and recessed features that a standard stylus cannot access. This accessory is installed by machinists, quality control technicians, and metrologists working with precision surface measurement equipment in machine shops, inspection departments, and manufacturing environments.

This stylus is intended for use specifically with the SPI SRG-4600 surface roughness gage. It is suited for applications where workpiece geometry requires a stylus with extended reach into deep or narrow grooves, bores, or similar recessed surfaces. Typical use cases include inspecting ground shafts, bored housings, and machined slots where surface finish verification is part of a quality inspection process or production acceptance criteria.

Key Features

• Deep groove geometry allows access to narrow channels and recessed workpiece features
• Direct replacement accessory stylus for the SPI SRG-4600 surface roughness gage
• Compact form factor with a 0.1-inch length profile at the tip for tight-access measurement
• Sold individually, allowing single-unit replacement as needed

Compatibility

Designed for use with the SPI SRG-4600 surface roughness gage.

Installation Notes

Stylus replacement should be performed by a qualified metrologist or technician familiar with the SRG-4600 gage. Power down or disengage the gage before swapping the stylus to avoid tip damage or inaccurate calibration reference. Handle the stylus tip with care, as contact-tip geometry is precision-ground and vulnerable to damage from improper handling or dropping. Verify gage calibration after stylus replacement per the instrument manufacturer's procedure.