STM 1-2-3 Blocks, 23 Holes - 230-870 1" x 2" x 3" Heat treated and case hardened to HRC 55-60 . Precision ground and case hardened. Surface finish 616 micro inches. 23 holes5 are tapped in 3/8-16. Squareness: .0001" Parallelism: .0003"
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STM 1-2-3 Blocks, 23 Holes – 230-870
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