Metric Hex Flange Bolt (B18.2.3.4M): Dimensions & Specifications

Metric Heavy Hex Flange Bolt Drawing 

Metric Hex Flange Bolt (B18.2.3.4M) | Units: mm

Nominal
Size of Screw

 Width
Across Flats
(F)

Width
Across Corners
(G)

 

Flange
Diameter
(B)

 Body
Diameter
(E)		 Head
Height
(H)

Hex
Height
(K)

Thread
Length
(LT)
Max Min Max Min Max Max Min Max Min Basic
M5 7.00 6.64 8.08 7.44 11.4 5.00 4.82 5.60 2.80 16.00
M6 8.00 7.64 9.24 8.56 13.6 6.00 5.82 6.90 3.40 18.00
M8 10.00 9.64 11.55 10.80 17.0 8.00 7.78 8.50 4.20 22.00
M10 13.00 12.57 15.01 14.08 20.8 10.00 9.78 9.70 5.70 26.00
M12 15.00 14.57 17.32 16.32 24.7 12.00 11.73 12.10 6.10 30.00
M14 18.00 17.57 20.78 19.68 28.6 14.00 13.73 12.90 7.10 34.00
M16 21.00 20.16 24.25 22.58 32.8 16.00 15.73 15.20 8.70 38.00

 

B18.2.3.4M Class 8.8 B18.2.3.4M Class 10.9 B18.2.3.4M Class 12.9
Material: 10B21/AISI 1035 Material: Alloy Steel AISI 4135 Material: Alloy Steel AISI 4135
Tensile Strength: Min 800 MPa Tensile Strength: Min 1040 MPa Tensile Strength: Min 1220 MPa
Core Hardness: HRC 22~32 Core Hardness: HRC 32~39 Core Hardness: HRC 39~44
Class of Thread: M5 through M16, 6g Class of Thread: M5 through M16, 6g Class of Thread: M5 through M16, 6g