Starrett 53054 Mechanical Tubular Micrometer 24 in

Product Description

The STARRETT 53054 is a mechanical tubular micrometer designed for large-diameter and deep-bore measurement applications requiring extended reach. With a 24-inch measurement range and 0.001-inch graduation, it delivers 0.0001-inch accuracy for precision layout and inspection work. The friction thimble provides consistent measuring force to protect both the workpiece and the instrument. Seven extension rods with a 3/8-inch (9.53 mm) diameter allow the operator to build up to the full range incrementally. A satin chrome finish resists corrosion and reduces glare during use. This instrument is intended for skilled tradespeople, machinists, metrologists, and quality control technicians working in manufacturing, fabrication, and inspection environments.

The STARRETT 53054 is suited for measuring large bores, cylinders, pipe interiors, and structural openings where standard fixed-frame micrometers cannot reach. It is commonly used in heavy fabrication shops, machine shops, and industrial maintenance settings. The modular rod system makes it practical for a range of measurement tasks without swapping instruments. It is appropriate for both shop-floor and inspection-room use where ASME B89 dimensional measurement standards apply.

Key Features

• 24-inch total measurement range built up using 7 included extension rods
• 0.001-inch graduation with 0.0001-inch accuracy for high-precision readings
• Friction thimble provides repeatable, controlled measuring force
• Extension rods feature hardened and ground anvils adjustable for length
• 3/8-inch (9.53 mm) rod diameter for stable contact across measurement range
• Satin chrome finish for corrosion resistance and reduced glare

Compatibility

Designed as a standalone tubular micrometer for large-range internal and bore measurement; extension rods are included and matched to this instrument.

Installation Notes

Tubular micrometers of this type are handled and calibrated by machinists or metrologists — no power source or utility shutoff is required. Ensure the instrument is zeroed and verified against a known standard before use. Handle extension rods carefully to avoid nicking the hardened anvil faces, which will affect accuracy. Store the instrument in its case when not in use to protect the measuring surfaces.