These 1-2-3 blocks are essential tools for machinists, fabricators, and precision hobbyists. Built for durability and versatility, each block is hardened, precision ground, and carefully engineered to ensure reliable performance in setup, inspection, layout, and machine work. Whether used for clamping, alignment, or fixture setups, these blocks offer the strength, squareness, and accuracy required in professional environments.

Features:

• Hardened and precision ground on all 6 sides of each block

• Heat treated and case hardened to HRC 58-62 for long-term wear resistance

• Five 3/8-16 tapped holes per block for easy clamping and fixture applications

• Eighteen untapped holes for flexible configuration and weight reduction

• Cross-drilled design for optimal strength-to-weight ratio

• Machined for high squareness and parallelism for accurate alignment

Specifications:

• Tapped Holes: 5 per block (3/8"-16 thread)

• Untapped Holes: 18 per block

• Hardness: HRC 58–62

• Surface Finish: Precision ground on all 6 sides

• Accuracy:

  • Squareness: Tolerance within 0.0001"

  • Parallelism: Tolerance within 0.0001"

  • Height of pair: Tolerance within 0.0001"

Comes With:

• One pair of 1-2-3 blocks (2 pieces total)