Starrett 72705 Outside Micrometer Set 20-24 in 4 Pc

Product Description

The STARRETT 72705 is a 4-piece mechanical outside micrometer set covering a measurement range of 20 to 24 inches, with each micrometer spanning a 1-inch interval. Built for precision dimensional measurement in heavy industrial and manufacturing environments, this set features a ratchet stop thimble for consistent measuring pressure and steel measuring faces for durability under repeated use. The satin chrome finish reduces glare during use. These micrometers are designed for machinists, toolmakers, and metrology technicians who require accurate large-bore and large-diameter measurement on the shop floor or inspection bench.

This set is suited for large-scale precision work such as measuring shafts, cylinders, bores, and machined components that fall in the 20 to 24 inch range. Each micrometer in the set covers one inch of that range, with individual units corresponding to the 20, 21, 22, and 23 inch measurement standards. The set ships in a protective case, keeping each instrument organized and protected between uses. Typical users include tool and die shops, aerospace and heavy equipment fabrication facilities, and industrial inspection departments.

Key Features

• 4-piece set covers 20 to 24 inches in 1-inch increments
• Ratchet stop thimble delivers repeatable, consistent measuring pressure
• Steel measuring faces resist wear during high-frequency use
• Satin chrome finish minimizes glare and corrosion
• Includes protective storage case for all four micrometers
• Non-rotating spindle design maintains measurement stability

Compatibility

Designed for large-diameter outside measurement applications requiring precision instruments in the 20 to 24 inch range. Compatible with standard micrometer standards sized 20, 21, 22, and 23 inches as included with the set.

Installation Notes

Outside micrometers of this size range are precision instruments and should be handled and stored by qualified metrology or machining personnel. Before use, verify calibration against the included standards and allow the instrument to thermally stabilize in the measurement environment. Do not use excessive force when closing the thimble; always use the ratchet stop to apply consistent pressure. Store each micrometer in the provided case when not in use to protect the measuring faces and spindle threads.