This package includes 2 sets of Precision Blocks (4 PCS Total). These 1-2-3 blocks are versatile setup tools for machining, fabrication, inspection, layout, and precision hobby work. Each block is hardened, heat treated, and precision ground on all six sides to provide the durability and accuracy needed for repeatable workshop setups. With five 3/8"-16 tapped holes and eighteen untapped holes per block, they can be used in a wide range of clamping, fixturing, alignment, and positioning applications. Their cross-drilled design helps reduce weight while maintaining practical strength, and the precision-machined surfaces support accurate squaring and parallel setup work. Features Hardened and precision ground on all 6 sides Heat treated and case hardened to HRC 58-62 Designed for setup, inspection, layout, clamping, alignment, and fixture work Five 3/8"-16 tapped holes per block Eighteen untapped holes per block Cross-drilled construction helps reduce weight while maintaining strength Precision machined for accurate squareness and parallelism Supplied as a matched pair Specifications Product Type: 1-2-3 blocks Quantity: 4 blocks Tapped Holes: 5 per block Thread Size: 3/8"-16 Untapped Holes: 18 per block Hardness: HRC 58-62 Surface Finish: Precision ground on all 6 sides Squareness Tolerance: Within 0.0001" Parallelism Tolerance: Within 0.0001" Height of Pair Tolerance: Within 0.0001" Comes With Two pairs of 1-2-3 blocks 4 blocks total FAQ What are 1-2-3 blocks used for?They can be used for machining setups, clamping, alignment, inspection, layout, fixture work, and other precision positioning applications. Are all six sides precision ground?Yes. Each block is precision ground on all six sides. How hard are the blocks?The blocks are heat treated and case hardened to HRC 58-62 for wear resistance. Do the blocks have threaded holes?Yes. Each block has five 3/8"-16 tapped holes. How many untapped holes are in each block?Each block has eighteen untapped holes. How accurate are the blocks?Squareness, parallelism, and the height of the pair are each specified to a tolerance within 0.0001". How many blocks are included?The set includes two pairs for a total of four blocks.
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