Blocks, 1-2-3, Ultra Precision

- Threaded holes are 3/8"-16 thread
- Through holes are 5/16"
- Pair of 1-2-3 blocks
- Five 3/8"-16 x 1-1/2" Socket Head Cap Screws
- One Hex Wrench
These ultra precision 1-2-3 blocks are ground and case hardened on all sides to 55-60 Rc. They are parallel within 0.0001", flat within 0.0001" and square within 0.0001". They are up to 0.0003" oversize for lapping.
Each set includes two matched blocks.
The blocks have 23 holes through them. Five are threaded 3/8-16 NC, and the other through holes are 5/16" diameter.
The set includes a matched pair of 1-2-3 blocks, five 3/8-16 x 1.5" socket head cap screws and a hex wrench. Furnished in a fitted case.

- Use as parallels: Set your large workpiece on 1-2-3 blocks and clamp it to the table so you can drill through holes without damaging your mill table.
- Use as fixtures: 1-2-3 blocks can be clamped to a machine table and used to create a repeating set-up for machining identical parts.
- Check your calipers: Since 1-2-3 blocks are made to tight tolerances, they can be used to verify the accuracy of your calipers.
- Use for measuring: Hold a 1-2-3 block against your workpiece to make a protruding edge that you can measure to.