Blocks, 1-2-3, Universal 11 Hole Set

These 1-2-3 blocks are ground and case hardened on all sides to 55-62 Rc. The blocks are 1″ x 2″ x 3″.

They are parallel within 0.0002″ and have a .0001″ to .0003″ over allowance for nominal lapping.

Each set includes two matched blocks. These blocks can be bolted together using 5/16″-18 socket head cap screws (not included).

The blocks have 11 holes, six drilled through with deep recesses for clamping, and five tapped holes which are threaded 5/16″-18 NC.