Disc-Type Micrometers with rotating or non-rotating Spindles by Starrett
No. 256 Series (0-3")
No. 256M Series (0-75mm)
These tools are used to measure the thickness of work sections such as ribs, lands, fins, cutting edges on form tools, and chordal thickness of gear teeth. Because of their large anvil and spindle faces, the 1" and 25mm sizes are also useful for
measuring the thickness of sheet materials like paper, cardboard, rubber, and plastics.
Readability features
- Starrett satin chrome finish – no glare – resists rust
- Advanced sleeve design with staggered lines and distinct figures for precise and easy readability
- Quick-reading figures – every thousandth numbered on inch tools
- Convenient decimal equivalents on 1" and 2" reading tools
Ease-of-Handling Features
- Balanced frame and thimble design insure easy handling and better readability
- Ring-type knurled lock nut for quick and sure locking
- The combination ratchet and speeder for uniform pressure and quicker adjustment on all sizes
- Gracefully designed tapered frame for use in narrow slots and tight places
- Anvil and spindle discs are 1/2" (12.7mm) diameter tapering to .015" (0.4mm) edge thickness making it possible to enter narrow grooves and recesses
- Available in the 1" and 25mm sizes with rotating or non-rotating spindle
Accuracy and Long-Life Features
- Rigid one-piece frame of drop forged steel
- Extremely hard and stable one-piece spindle (the heart of our accuracy)
- Micro-lapped measuring faces
- Quick and easy adjustment
- Starrett workmanship
- This tool is accurate to ±.00015" or ±0.003mm measuring over the whole surface and ±.0002" or ±0.004mm measuring on the edges
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Starrett Tool Index 
