SPI 1-2-3 Block Set – 13-670-5

Hardened steel to RC 55-60, ground to surface finish 6-16 microinches.

Matched 1-2-3 Blocks

• Squareness of all sides within 0.0001″
  per inch on 1-2-3 Blocks, 0.0003″
  per inch on 2-3-4 Blocks.
• Five tapped holes (38″-16)
  18 untapped holes (0.340″ dia.).

0.0001 Squareness Per Inch, Hardened Steel, 1-2-3 Block with 23 Hole Setup Block

See all SPI 1-2-3, 2-3-4 and 2-4-6 Block Sets