Blocks, 1-2-3, Ultra Precision
1-2-3 blocks provide a precise, stable, and reusable reference for ensuring accuracy in machining, inspection, and layout tasks, making them a staple in all machine shops.
These ultra precision 1-2-3 blocks are parallel within 0.0001", flat within 0.0001" and square within 0.0001". They are up to 0.0003" oversize for lapping.
Each set includes two matched blocks.
- The blocks have 23 holes through them. Five are threaded 3/8-16 NC, and the other through holes are 5/16" diameter.
- The set includes a matched pair of 1-2-3 blocks, five 3/8-16 x 1.5" socket head cap screws and a hex wrench.
- Blocks are ground and case hardened on all sides to 55-60 Rc.
Furnished in a fitted case.
Before you pay
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When it ships
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Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.
Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.
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Standard Shipping · United States: $0.00
Express Shipping · United States: $3.99
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United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.
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