10 Pair 1/8 X 5 Machinist Parallel Block Tool Set For Precision Milling Pro Grade Ultra Accurate To 0.0002 In Parallelism 1/2 To 1-5/8 Inch Range Alloy Steel 40Cr Matched Parallel Bars
✔️ 20 pcs, 10 sizes, 40Cr steel, 0.0002 in parallelism tolerance
These precision machinist parallel blocks are compact 5-inch long tools crafted from 40Cr steel. They are essential in metalworking and woodworking fixture setups to ensure exact squareness and stable parallelism during milling, drilling, and inspection tasks.
✅ Material: 40Cr steel for strong, wear‑resistant blocks
✅ Size range: 5" length, 1/8" thick, widths from 1/2" to 1-5/8"
✅ Accuracy: size tolerance ±0.0003", parallelism 0.0002"
✅ Hole options: matched holes per pair, sizes 13/64" to 1/2"
✅ Pack includes 20 blocks (10 sizes), two each, boxed for protection
✅ Hardness: HRC52-58 for durable use
💡 What is a machinist parallel block set used for in precision milling? They provide precise reference planes to align workpieces and fixtures during milling and drilling.
- Handy for quick squaring in fixed setups
- Improves parallelism and repeatability in milling and drilling
- Works with standard vises and fixtures for a ready-to-use setup