Starrett 68056 Mechanical Outside Micrometer 0.01 in

Product Description

The STARRETT 68056 is a mechanical outside micrometer designed for precise linear measurement of external dimensions. It features a ratchet stop thimble that applies consistent measuring pressure, reducing operator-induced variation across repeated readings. The measuring faces are solid carbide, providing wear resistance for long-term accuracy in shop environments. Graduation is 0.01 inches with an accuracy of 0.002 millimeters, making it suitable for close-tolerance work. This micrometer is a manual instrument with no digital counter and a non-rotating spindle. Machinists, tool-and-die technicians, and precision maintenance trades rely on this class of instrument for dimensional verification during fabrication, inspection, and quality control work.

The STARRETT 68056 is appropriate for use in machine shops, fabrication facilities, and maintenance environments where external dimensional measurement is required. Its ratchet stop thimble makes it well suited for applications where consistent gauge pressure is critical to obtaining repeatable readings. The enamel finish provides durability in general shop conditions. This instrument is a standard outside micrometer format and fits into workflows that require hand-tool precision measurement without electronic components.

Key Features

• Graduation of 0.01 inches for fine linear measurement resolution
• Accuracy of 0.002 millimeters for close-tolerance inspection work
• Ratchet stop thimble ensures consistent measuring pressure across readings
• Solid carbide measuring faces resist wear for extended service life
• Non-rotating spindle prevents workpiece marking during measurement
• Enamel finish for durability in general shop environments

Compatibility

Designed as an OEM-style outside micrometer instrument; also referenced under Starrett catalog number 436.1MXRL-75. Verify measuring range against your application requirements before installation.

Installation Notes

Outside micrometers require no power source or mounting. Before use, clean the measuring faces and verify the instrument zeros correctly at its lower range limit using the appropriate standard or setting gauge. Store the micrometer with a slight gap between the faces to prevent damage from thermal expansion. Calibration intervals should follow your facility quality plan or applicable metrology standards.