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Bolt & Screw Thread Pitches

 

Imperial / Inch Thread Pitch Chart

Diameter UNC UNF 8-UN
#0 - 80 -
#1 64 72 -
#2 56 64 -
#3 48 56 -
#4 40 48 -
#5 40 44 -
#6 32 40 -
#8 32 36 -
#10 24 32 -
#12 24 28 -
1/4" 20 28 -
5/16" 18 24 -
3/8" 16 24 -
7/16" 14 20 -
1/2" 13 20 -
9/16" 12 18 -
5/8" 11 18 -
3/4" 10 16 -
7/8" 9 14 -
1" 8 12 (Special)
14 (Common)
-
1-1/8" 7 12 8
1-1/4" 7 12 8
1-3/8" 6 12 8
1-1/2" 6 12 8
1-3/4 5 - 8
2" 4-1/2 - 8
2-1/4" 4-1/2 - 8
2-1/2" 4 - 8
2-3/4" 4 - 8
3" 4 - 8
3-1/4" 4 - 8
3-1/2" 4 - 8
3-3/4" 4 - 8
4" 4 - 8



Metric / mm Thread Pitch Chart

Diameter Coarse Fine Fine (2/3/4)
M1 0.25 - -
M1.2 0.25 - -
M1.4 0.3 - -
M1.6 0.35 - -
M1.8 0.35 - -
M2 0.4 - -
M2.5 0.45 - -
M3 0.5 - -
M3.5 0.6 - -
M4 0.7 - -
M5 0.8 0.9 0.75 / 0.5
M6 1 0.75 0.5
M7 1 0.75 0.5
M8 1.25 1 0.75 / 0.5
M10 1.5 1.25 1 / 0.75
M12 1.75 1.5 1.25 / 1
M14 2 1.5 1.25 / 1
M16 2 1.5 1
M18 2.5 2 1.5 / 1
M20 2.5 2 1.5 / 1
M22 2.5 2 1.5 / 1
M24 3 2 1.5 / 1
M27 3 2 1.5 / 1
M30 3.5 3 2 / 1.5 / 1
M33 3.5 3 2 / 1.5
M36 4 3 2 / 1.5
M39 4 3 2 / 1.5
M42 4.5 4 3 / 2 / 1.5
M45 4.5 3 -
M48 5 3 -
M52 5 4 -
M56 5.5 4 -
M60 5.5 4 -
M64 6 4 -