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Screw Size Control Table for Matching Use of Metric Hexagona

Metric Spanner Specification
mm
Screw specifications
Inside hexagonal cylindrical head screw (cup head)
Hexagonal countersunk head screw (flat cup)
Internal hexagonal semicircular head screw (round cup)
Internal hexagonal fastening screw (machine meter)
Inside Hexagonal Cylindrical Head Shaft Shoulder Screw (Plug Strike)
0.7
 
 
 
M1.6
 
0.9
 
 
 
M2
 
1.3
M1.4
 
 
M2.5, M2.6
 
1.5
M1.6, M2
 
 
M3
 
2
M2.5
M3
M3
M4
 
2.5
M3
M4
M4
M5
 
3
M4
M5
M5
M6
M5
4
M5
M6
M6
M8
M6
5
M6
M8
M8
M10
M8
6
M8
M10
M10
M12, M14
M10
8
M10
M12
M12
M16
M12
10
M12
M14, M16
M14, M16
M18, M20
M16
12
M14
M18, M20
M18, M20
M22, M24
M20
14
M16, M18
M22, M24
M22, M24
 
 
17
M20
 
 
 
 

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