Unified Screw Thread Chart for Imperial Inch
What is the thread pitch for a unified inch bolt thread?
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| thread_inch | Diameter | UNC | UNF | 8-UN | | thread_inch | #0 | - | 80 | - | | thread_inch | #1 | 64 | 72 | - | | thread_inch | #2 | 56 | 64 | - | | thread_inch | #3 | 48 | 56 | - | | thread_inch | #4 | 40 | 48 | - | | thread_inch | #5 | 40 | 44 | - | | thread_inch | #6 | 32 | 40 | - | | thread_inch | #8 | 32 | 36 | - | | thread_inch | #10 | 24 | 32 | - | | thread_inch | #12 | 24 | 28 | - | | thread_inch | 1/4" | 20 | 28 | - | | thread_inch | 5/16" | 18 | 24 | - | | thread_inch | 3/8" | 16 | 24 | - | | thread_inch | 7/16" | 14 | 20 | - | | thread_inch | 1/2" | 13 | 20 | - | | thread_inch | 9/16" | 12 | 18 | - | | thread_inch | 5/8" | 11 | 18 | - | | thread_inch | 3/4" | 10 | 16 | - | | thread_inch | 7/8" | 9 | 14 | - | | thread_inch | 1" | 8 | 12 (Special)
14 (Common) | - | | thread_inch | 1-1/8" | 7 | 12 | 8 | | thread_inch | 1-1/4" | 7 | 12 | 8 | | thread_inch | 1-3/8" | 6 | 12 | 8 | | thread_inch | 1-1/2" | 6 | 12 | 8 | | thread_inch | 1-3/4 | 5 | - | 8 | | thread_inch | 2" | 4-1/2 | - | 8 | | thread_inch | 2-1/4" | 4-1/2 | - | 8 | | thread_inch | 2-1/2" | 4 | - | 8 | | thread_inch | 2-3/4" | 4 | - | 8 | | thread_inch | 3" | 4 | - | 8 | | thread_inch | 3-1/4" | 4 | - | 8 | | thread_inch | 3-1/2" | 4 | - | 8 | | thread_inch | 3-3/4" | 4 | - | 8 | | thread_inch | 4" | 4 | - | 8 |
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