123 Blocks are ideal for precision layout and setup
- Consisting of a matched pair of 1'' x 2'' x 3'' blocks, five plated 5/16''
- 18'' socket head cap screws and a hex key wrench.
- Each block is precision ground and case hardened on all 6 surfaces.• Surface finish 6 to 16 micro-inches.
- Squareness on all sides to .0001''.
- There are a total of 11 holes on three faces. Five 5/16''
- 18'' tapped holes arranged for holding down and for conversion to an angle plate. Six holes drilled through with deep recesses for easy clamping."
- Blocks are oversized to allow for normal lapping to .0003''.
