Mitutoyo 178-393 Hole Detector for SJ-210 Surftest

Product Description

The MITUTOYO 178-393 is a hole detector accessory designed for use with the SJ-210 Surftest portable surface roughness tester. It mounts to the SJ-210 to enable surface roughness measurements inside bores and holes where a standard stylus arm cannot reach. The detector features a 90-degree stylus angle and a 5.00 micrometer tip radius, allowing it to trace internal cylindrical surfaces accurately. With an overall diameter of 9.00 mm and an overall length of 60.30 mm, this compact accessory fits into tight bore geometries. Metrologists, quality technicians, and precision machinists install this accessory when inspecting internal surface finish on machined components.

The 178-393 is suited for quality control and inspection environments in manufacturing, toolroom, and metrology lab settings. It is used when internal bore surface texture must be characterized to a specified Ra or Rz value, such as on cylinder bores, valve bodies, hydraulic components, and precision-machined housings. The accessory is designed specifically for the portable SJ-210 Surftest instrument and extends its measurement capability beyond flat and external surfaces into internal features.

Key Features

• 90-degree stylus angle enables surface roughness measurement inside bores and holes
• 5.00 micrometer tip radius for accurate tracing of internal cylindrical surfaces
• 9.00 mm overall diameter allows access to tight internal geometries
• 60.30 mm overall length provides reach into deeper bore features
• Designed as a dedicated accessory for the MITUTOYO SJ-210 Surftest portable surface roughness tester

Compatibility

Designed for use with the MITUTOYO SJ-210 Surftest portable surface roughness tester. Confirmed compatible instrument type: Surftest Portable Surface Roughness Tester.

Installation Notes

Installation is performed by quality technicians or metrologists familiar with the SJ-210 Surftest instrument. Power down and disconnect the instrument before attaching or removing the hole detector accessory. Follow the SJ-210 operator manual for proper accessory mounting procedure and calibration steps after attachment. Handle the stylus tip with care to avoid damage that would affect measurement accuracy.