1-2-3 block

noun

A tool used in machining fields, especially milling, to aid in setup. It is a block of steel that is precisely squared and parallel whose sides are 1, 2, and 3 inches long, respectively. May contain arranged holes. Similar, larger blocks are called 2-4-6 blocks.

Similar
setup blockmachinist block
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Meanings

noun1-2-3 block (plural 1-2-3 blocks)

plural 1-2-3 blocks

  1. A tool used in machining fields, especially milling, to aid in setup. It is a block of steel that is precisely squared and parallel whose sides are 1, 2, and 3 inches long, respectively. May contain arranged holes. Similar, larger blocks are called 2-4-6 blocks.

    Synonyms: setup block, machinist block

Synonyms & antonyms

nounA tool used in machining fields, especially milling, to aid in setup. It is a block of steel that is precisely squared and parallel whose sides are 1, 2, and 3 inches long, respectively. May contain arranged holes. Similar, larger blocks are called 2-4-6 blocks.

Similar
setup blockmachinist block
Also see
machinist blocksetup block
Cite this entry
APA

1-2-3 block. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/1-2-3%20block

MLA

“1-2-3 block.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/1-2-3%20block. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “1-2-3 block,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/1-2-3%20block.

Source: 1-2-3 block on Wiktionary, CC BY-SA 4.0.