Matched Pair 1 2 3 Blocks Set for Milling Machines with 23 Holes, Precision Ground Tool Steel Blocks, 0.0003 Inch Overall Size Tolerance and 0.0001 Inch Flatness and Parallelism, Ideal for Setup, Layout and Inspection Waltyotur

Matched 1-2-3 Blocks Set (Pack of 2) for Milling
✔️ Precision-ground tool steel blocks with 23 holes for solid setup

These matched 1-2-3 blocks are precision-ground tool steel references used in milling, layout, and inspection to ensure accurate alignment and repeatable setup. They serve as a reliable base for squaring and measuring workpieces and are typically used on milling machines, inspection benches, or fixture jigs where tight tolerances matter.

✅ Overall size tolerance ±0.0003 in
✅ Flatness and parallelism on all six sides within ±0.0001 in
✅ Material: precision-grade tool steel hardened and ground, HRC 55-62
✅ Hole pattern: 23 holes (5) 3/8-16 threaded and (18) non-threaded; cross-drilled for strength
✅ Size: 1 x 2 x 3 in (25.4 x 50.8 x 76.2 mm)

💡 What is a matched 1-2-3 block used for in precision setups?

These blocks are handy tools that give you a reliable base for alignment and inspection, handy for milling fixtures and layout.

- reliable reference surface for alignment in milling setups and inspection
- flatness and parallelism within 0.0001 in to maintain tight tolerances
- 23-hole grid supports versatile clamping with threaded and non-threaded holes
- hardened tool steel resists wear in busy shops