External & Internal Thread Dimensions for UNF Screw Thread ...

External Thread Dimensions for Unified UNF Screw Threads Diameter Threads Thread Major Diameter Pitch Diameter Minor Diameter Stress Per Fit Class ( ) ( ) ( ) Area Inch Max Min Max Min Max in . (TPI). No 0 80 2A No 1 72 2A No 2 64 2A No 3 56 2A No 4 48 2A No 5 44 2A No 6 40 2A No 8 36 2A No 10 32 2A No 12 28 2A 1/4 28 2A 5/16 24 2A 3/8 24 2A 7/16 20 2A 1/2 20 2A 9/16 18 2A 5/8 18 2A 05828 3/4 16 2A 7/8 14 2A 1 12 2A 12 2A 12 2A 12 2A 12 2A Internal Thread Dimensions for Unified UNF Screw Threads Diameter Threads Thread Major Diameter Pitch Diameter Minor Diameter Stress Per Fit Class Area Inch Min Max Min Max Min in . (TPI). No 0 80 2B No 1 72 2B No 2 64 2B No 3 56 2B No 4 48 2B No 5 44 2B No 6 40 2B No 8 36 2B No 10 32 2B No 12 28 2B 1/4 28 2B 5/16 24 2B 3/8 24 2B 7/16 20 2B 1/2 20 2B 9/16 18 2B 5/8 18 2B 3/4 16 2B 7/8 14 2B 1 12 2B 12 2B 12 2B 12 2B 12 2B

External Thread Dimensions for Unified UNF Screw Threads Diameter Threads Per Inch (TPI) Thread Fit Class Major Diameter (“) Pitch Diameter (“) Minor Diameter (“) Stress Area Max Min Max Min Max in² No 0 80 2A 0.0595 0.0563 0.0514 0.0496 0.0446 0.00180 No 1 …

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