Spi MS160712140 Mechanical Hole Micrometer 0.24-0.28 in

Product Description

The SPI MS160712140 is a mechanical hole micrometer designed for precise internal diameter measurements in the 0.2400 to 0.2800 inch range. It delivers 0.0001 inch graduation and 0.0001 inch accuracy, making it suitable for close-tolerance inspection work in machining, manufacturing, and mechanical service environments. The chrome-finished instrument features carbide measuring surfaces for durability and self-centering contact points that promote repeatable, accurate readings. A ratchet stop thimble controls measuring force and reduces operator-to-operator variation. NIST-traceable calibration documentation is included. This tool is used by machinists, toolroom technicians, quality control inspectors, and precision mechanical tradespeople.

The MS160712140 is built for inspecting small bores, holes, and internal features where a standard caliper or plug gauge lacks the resolution required. It is well-suited to residential and commercial machine shop environments, engine rebuilding, hydraulic component service, and any precision mechanical application requiring verified internal measurement at this diameter range. The included setting ring at 0.2400 inches allows field calibration before use. Two contact points provide stable seating inside the bore.

Key Features

• Measurement range: 0.2400 to 0.2800 inches with 0.0001 inch graduation
• Accuracy rated at 0.0001 inches (0.002 mm)
• Carbide measuring surfaces for wear resistance and long service life
• Ratchet stop thimble for consistent, controlled measuring force
• Self-centering contact points for repeatable bore alignment
• NIST-traceable calibration certificate included
• Chrome finish; includes one setting ring at 0.2400 inches

Compatibility

Designed for internal diameter measurement applications requiring a 0.2400 to 0.2800 inch range. Compatible with standard hole micrometer accessories and setting rings of matching diameter.

Installation Notes

Hole micrometers are used by machinists and precision inspection technicians — no installation in the traditional sense applies. Before use, zero and verify the instrument against the included setting ring on a clean, temperature-stabilized surface. Always clean the measuring surfaces and bore before taking a reading to prevent debris from affecting accuracy. Handle with care; dropping or overtightening can affect calibration and should be followed by re-verification against the setting ring.