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BL-123NH Pair of 1 x 2 x 3 Blocks without holes
Our part # ALL-55525
Heat treated and case hardened to HRC 57-62
Made of precision-grade tool steel hardened and ground on all 6 sides of block
Accuracy and squareness on all sides within .0001"-.0002"
Precision ground. Case hardened. Solid blocks without holes. Heat treated above 48 Rockwell "C"; .0001 to .0003 over allowance for nominal lapping. Squareness of all sides is within .0002 per inch.