Item # 25-3103-00, High Precision 1-2-3 Blocks on S-T Industries, Inc. S-T Industries, Inc. - Item # 25-3103-00, High Precision 1-2-3 Blocks
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High precision 1-2-3 block set

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Item # 25-3103-00, High Precision 1-2-3 Blocks


Each set consists of a pair of 1" x 2" x 3" blocks, five 3/8-16 stainless steel socket head cap screws and a hex key wrench.
  • Each block is ground and case hardened on all six surfaces
  • Surface finish 6 to 16 micro inches
  • Squareness on all sides to .0001"
  • 23 holes: 5 tapped 3/8-16, 18 untapped thru holes
  • Oversized to allow for normal tapping .0001" - .0003"
  • Case hardened to 50-60 HRC
  • Supplied in a custom molded case

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