Pro Grade High Precision 1 X 2 X 3 Inch Parallel Block Set With 23 Holes For Milling Machines Built From Hardened Tool Steel HRC 55 62 Squareness Within 0.0002 Inch Includes 5 Tapped Holes 3/8-16 And 18 Untapped Holes For Precise Clamping And Alignment

High-precision 1x2x3 in parallel block set with 23 holes
✔️ Hardened tool steel 1x2x3 in, 23 holes incl 5 tapped 3/8-16

These precision parallel blocks are hardened tool steel parts used in milling machines for setup, alignment, and inspection. Each block is ground on all sides, delivering squareness within 0.0002 inch and a reliable reference for fixtures or gages.

✅ Material: hardened ground steel, heat treated and case hardened to HRC 57-62
✅ Size: 1 x 2 x 3 in (25.4 x 50.8 x 76.2 mm)
✅ Holes: 23 total; 5 tapped 3/8-16 for clamping, 18 untapped
✅ Squareness: within 0.0002 in on all sides
✅ Cross-drilled design reduces weight while maintaining strength
✅ Usage: setup, layout, and inspection in milling and drilling work

💡 What is a parallel block set used for in milling and inspection setups? - Handy reference for alignment and squareness in machining tasks - Useful for setup, layout, and inspection across milling, drilling, and CNC work - Helps maintain repeatable positioning with a 23-hole grid