Starrett 92258 Rectangle Steel Gage Block 0.25 in Grade 0

Product Description

The STARRETT 92258 is a rectangular steel gage block machined to Grade 0 accuracy for precision measurement applications in tool rooms, metrology labs, and machine shops. At 0.25 inches nominal size, this block serves as a reference standard for calibrating measuring instruments, setting comparators, and verifying part dimensions. Grade 0 tolerances indicate a high level of dimensional accuracy suitable for inspection and quality control work. Steel construction provides the durability and stability required for repeated use in demanding shop environments. Licensed metrology technicians and precision machinists are the primary users of this type of block.

This gage block is appropriate for use in machine shops, inspection departments, and tool rooms where traceable dimensional references are required. It is suited for surface plate work, height gauge setup, and instrument calibration tasks in both light manufacturing and precision fabrication settings. The 0.25-inch size is a commonly specified increment in standard gage block sets and is frequently used as a standalone reference block or to build specific stack measurements.

Key Features

• Grade 0 accuracy for high-precision measurement and inspection use
• 0.25-inch nominal size machined to five-decimal precision
• Steel construction for durability and dimensional stability
• Rectangular form compatible with standard gage block accessories and holders
• Suitable for wringing into block stacks for custom measurement builds

Compatibility

Designed as an OEM-style replacement or supplemental block for use in standard rectangular steel gage block sets requiring Grade 0 accuracy at the 0.25-inch size increment.

Installation Notes

Gage blocks should be handled by metrology technicians or precision measurement personnel familiar with proper wringing technique and block care. Clean mating surfaces thoroughly before wringing to prevent abrasion damage and ensure accurate stack measurements. Store blocks in a protective case away from humidity and temperature extremes to maintain calibration integrity. Do not drop or impact blocks, as this can alter surface flatness and compromise accuracy grade.