256 with Rot a ting or Non-Rot a ting Spindles 0-3"/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 Fea tures • 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 Fea tures • Balanced frame and thimble design ensure 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 • Anvilandspindlediscsare1/2"(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 Fea tures • Rigid one-piece frame of drop forged steel • Extremely hard and stable one-piece spindle (the heart of our accuracy) • 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 Disc-Type Micrometers 256 Disc-Type Micrometers (.001" Graduation) Cat. No. EDP Range 256RL-1 51236 0-1" 256PN-1 56469 0-1" 256RL-2 55940 1-2" 256RL-3 55941 2-3" 256M Disc-Type Micrometers (0.01mm Graduation) Cat. No. EDP Range 256MRL-25 51238 0-25mm 256MPN-25 56470 0-25mm 256MRL-50 55942 25-50mm 256MRL-75 55943 50-75mm Cases for 256 and 256M Disc-Type Micrometers Cat. No. EDP Description 910 55397 Deluxe case for 1" and 25mm micrometers 912 55399 Deluxe case for 2" and 50mm micrometers 922 55222 Deluxe case for 3" and 75mm micrometers 256PN-1 256MRL-50 53 starrett.com M icrometers