Mitutoyo 611165-531 Steel Gage Block 0.125 in Grade 0

Product Description

The MITUTOYO 611165-531 is a rectangular steel gage block measuring 0.125 inches, manufactured to Grade 0 accuracy and supplied with a Certificate of Inspection. Gage blocks are high-precision reference standards used to calibrate measuring instruments, verify machine setups, and establish dimensional references on the shop floor. Grade 0 indicates a tightly controlled tolerance class per ASME standards, making this block suitable for calibration lab work and toolroom verification tasks. It is handled and used by metrology technicians, machinists, and quality control personnel who require traceable dimensional standards.

This gage block is intended for use in precision measurement environments including toolrooms, metrology labs, and manufacturing quality departments. It serves as a reference standard for verifying the accuracy of calipers, micrometers, height gauges, and comparators. The 0.125-inch nominal size fills a common reference need in inch-series measurement setups. The included Certificate of Inspection provides documentation of conformance, supporting quality system requirements in regulated manufacturing environments.

Key Features

• Grade 0 accuracy class per ASME standards for precision calibration and reference use
• Rectangular steel construction for durability and stable dimensional reference
• 0.125 inch nominal size with five-decimal inch precision specification (0.12500 inches)
• Includes Certificate of Inspection for traceability documentation
• Single-piece package — sold individually for targeted set additions or replacements

Compatibility

Designed as an OEM-style precision reference standard for use with inch-series gage block sets and compatible with standard rectangular gage block holders, fixtures, and optical flats used in toolroom and metrology lab applications.

Installation Notes

Gage blocks are handled by metrology technicians and quality control professionals. Blocks should be wrung together or placed in holders using clean, lint-free gloves or finger cots to prevent corrosion from skin oils. Store blocks in their protective case when not in use and allow adequate thermal stabilization time before use in temperature-controlled environments. Do not drop or impact gage blocks, as damage to lapped surfaces will compromise accuracy.