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

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

Matched 1-2-3 and 2-3-4 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.).

Matched 2-4-6 Blocks

• Squareness of all sides
  within 0.0003″ per inch.
• Five tapped holes (58″-11)
  18 untapped holes (0.520″ dia.)