Starrett 72735 Mechanical Outside Micrometer 8 in Ratchet Stop

Product Description

The STARRETT 72735 is a mechanical outside micrometer designed for precision measurement in demanding shop and field environments. It covers a full 8-inch measurement range with a graduation of 0.0001 inches and an accuracy of 0.0001 inches, making it suitable for close-tolerance work in machining, fabrication, and mechanical trade applications. The ratchet stop thimble delivers consistent measuring force across readings, reducing operator-to-operator variation. Solid carbide measuring faces resist wear on hardened or abrasive workpieces. A ring-style lock nut secures the spindle position once a measurement is set. The instrument ships with a lock nut and wrench included.

This micrometer is used by machinists, tool-and-die technicians, maintenance mechanics, and precision fabricators working on large-diameter parts, shafts, housings, and structural components where measurements fall in the 0 to 8-inch range. It is appropriate for both shop floor and inspection applications where a mechanical, non-digital readout is preferred or required. The flat anvil configuration suits flat and cylindrical workpiece surfaces across general industrial and trade settings.

Key Features

• 8-inch maximum measurement range for large-diameter workpieces
• 0.0001-inch graduation and 0.0001-inch accuracy for close-tolerance measurements
• Ratchet stop thimble ensures repeatable, consistent measuring force
• Solid carbide measuring faces for extended wear resistance
• Ring-style lock nut holds spindle position; lock nut and wrench included
• Flat anvil design suits a wide range of workpiece geometries

Compatibility

Designed as a standard outside micrometer replacement or addition for applications requiring 0 to 8-inch mechanical measurement capability. Also referenced as Starrett model T436XRL-8.

Installation Notes

Outside micrometers require no installation; however, calibration verification against a known standard before first use is standard shop practice. Handle the instrument by the frame or insulating grip areas to prevent thermal expansion from body heat affecting accuracy. Store in the provided case when not in use to protect the carbide measuring faces. Cleaning measuring faces with a lint-free cloth before each use is recommended to maintain measurement integrity.