METRIC - Carriage Bolts (Square Neck - Large): Technical Information | AFT Fasteners

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METRIC - Carriage Bolts (Square Neck - Large): Technical Information

 Metric Carriage Bolts Drawing

METRIC - Carriage Bolts (ISO 8677; DIN 603; JIS B 1171)

Nominal Diameter




Pitch
(mm)

 

 

O

C

P

A

H

L1

 Square Width Across Flats

Square
Width
Across
Corners

Square
Depth

 

Head Diameter

 

Head Height

 

Thread
Length
<=125

Thread Length
>125 & <=200

Thread Length
>200

mm Max Min Min Max Min Max Min Max Min Ref Ref  Ref
M5 0.8 5.48 4.52 5.9 4.1 2.9 13 11.9 3.1 2.5 16 20  -
M6 1 6.48 5.52 7.2 4.6 3.4 16 14.9 3.6 3 18 24 -
M8 1.25 8.58 7.42 9.6 5.6 4.4 20 18.7 4.8 4 22 28  41
M10 1.5 10.58 9.42 12.2 6.6 5.4 24 22.7 5.8 5 26 32  45
M12 1.75 12.7 11.3 14.7 8.8 7.2 30 28.7 6.8 6 30 36  49
M16 2 16.7 15.3 19.9 12.9 11.1 38 36.4 8.9 8 38 44  57
M20 2.5 20.84 19.16 24.9 15.9 14.1 46 44.4 10.9 10 46 52  65
 
Tolerance on Length 20-33mm: ±1.05 35-50mm: ±1.25 55-80mm: ±1.5
90-120mm: ±1.75 130-150mm: ±2.0 160-180mm: ±4.0 200mm:±4.6

 


Description

round head, self-anchoring bolt and metric thread pitch with square neck under the head.


Applications/
Advantages

The square neck is intended to ensure that the bolt does not turn as nut is tightened.
Best for wood or thick metal sheet applications.


Material

 

Steel

Stainless

Class 4.6 carriage bolts are produced of carbon steel that conforms to the following chemical composition - Carbon: 0.55% maximum; Phosphorus: 0.05% maximum; Sulfur: 0.06% maximum.

 A2-50 and A4-50

Hardness

Rockwell B 67 - 99.5 (Vickers HV 120 - 250)

-

Yield Strength

240 N/mm2 minimum

30,450 psi.

Tensile Strength

400 N/mm2 minimum

72,500 psi.

Plating

See table for more info.

Typically, stainless carriage bolts are provided without extra finishes.