Mitutoyo 178-601 Precision Reference Specimen

Technical Overview

Precision metric reference standard for calibrating stylus-type surface testers. Features nominal Ra 3.0 µm and Ry 9.4 µm values in a protective casing.

Key Features

High-precision reference specimen with nominal values of Ra ≈ 3.0 µm and Rmax (Ry) 9.4 µm.
Specimen size of 32 x 22 mm offers an optimal area for stylus tracing and calibration.
Encased in a shockproof, slip-resistant plastic housing (55 x 46 mm) for shop floor protection.
Compatible with Mitutoyo Surftest SJ-210, SJ-310, SJ-410, and other surface roughness measurement systems.
Ensures compliance and calibration traceability for quality control and metrology laboratories.

Technical Specification Matrix

Parameter	Value
Nominal Roughness Value (Ra)	approx. 3.0 µm
Nominal Roughness Value (Rmax/Ry)	9.4 µm
Specimen Area Size	32 x 22 mm
Casing Dimensions	55 x 46 mm
Casing Material	Shockproof, slip-resistant plastic
Compatible Instruments	Mitutoyo Surftest SJ-210, SJ-310, SJ-410 Series
Measurement Unit	Metric
Physical Weight (kg)	0.08
Dimensions L x W x H (cm)	5.5 x 4.6 x 1

Industrial Applications

1. Automotive Cylinder Bore Texture Calibration

Calibrating stylus-type surface roughness testers used to evaluate the cross-hatched pattern inside automotive engine cylinder blocks. The tester must precisely measure the Ra value to ensure proper oil retention and piston ring wear.

Problem Solved

Ensures the measurement integrity of the Surftest stylus before profiling the cylinder walls. A deviation in calibration could lead to accepting components with incorrect micro-texture, causing engine friction or high oil consumption.

Surface RoughnessCalibration StandardStylus ProfilometerRa 3.0 µmQuality Control

2. Precision Hydraulic Rod Surface Verification

Regular calibration of portable roughness checkers used on the manufacturing line of hydraulic cylinders and piston rods. These rods require an extremely specific finish to prevent seal damage while maintaining fluid lubrication.

Problem Solved

Solves the risk of measurement drift over time due to environmental factors like temperature or micro-shocks to the portable tester. Using the 178-601 reference standard on-site ensures the tester operates within its ±3% nominal accuracy range.

Hydraulic PistonMetrologySurface TextureCalibration BlockSurftest SJ-210

3. Machine Shop CNC Lathe Surface Finish Quality Auditing

Verification of surface roughness measurement equipment in machine shops producing turned aerospace parts. Periodic validation against a certified Ra 3.0 µm reference specimen is required to pass quality audits.

Problem Solved

Ensures continuous traceability and calibration conformance to ISO/JIS standards. By validating the instrument against a stable, known reference specimen on the shop floor, machinists avoid shipping out-of-tolerance parts.

CNC TurningRoughness VerificationTraceabilityAerospace ManufacturingReference Specimen