Starrett 72738 Mechanical Outside Micrometer 11 in

Product Description

The STARRETT 72738 is a mechanical outside micrometer designed for precise linear measurement of external dimensions. It covers an 11-inch measurement range with a graduation of 0.0001 inches and an accuracy of 0.0001 inches, making it suitable for high-tolerance inspection work. The ratchet stop thimble provides consistent measuring pressure to reduce operator-to-operator variation. Solid carbide measuring faces resist wear over extended use. A ring-style lock nut secures the spindle position once a reading is taken. This tool is used by machinists, metrology technicians, and quality control professionals in production and inspection environments.

The STARRETT 72738 is suited for shop-floor and inspection-room applications where large-diameter or long workpieces require outside measurement beyond standard 1-inch or 6-inch micrometer ranges. Its 11-inch capacity accommodates shafts, cylinders, and machined components common in heavy manufacturing, tooling, and precision fabrication. The satin chrome finish reduces glare under shop lighting. A lock nut and wrench are included for immediate use out of the box.

Key Features

• 11-inch maximum measurement range for large workpieces
• 0.0001-inch graduation and 0.0001-inch accuracy for high-tolerance readings
• Ratchet stop thimble delivers consistent, repeatable measuring pressure
• Solid carbide measuring faces on both anvil and spindle for extended wear life
• Ring-style lock nut with included wrench for secure spindle locking
• Satin chrome finish minimizes glare in bright work environments

Compatibility

Designed as a standard outside micrometer for use in any application requiring mechanical measurement of external dimensions up to 11 inches. Also referenced under Starrett Number T436XRL-11.

Installation Notes

Outside micrometers require no installation but should be calibrated against a certified gauge block or standard before first use and periodically thereafter. Store in the supplied case or a protected location away from temperature extremes to maintain calibration. Clean measuring faces with a lint-free cloth before and after use. Do not overtighten the lock nut, as this can stress the frame and affect accuracy.