Carriage, Square-Neck & Nib Bolts

Carriage Bolts

GB/T 14-2013 (reference only)

Nominal size d

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GB/T 14-2013 dimension drawing

Dimensions in mm

Specification parameters

Equivalent standards

Standard	Standard body

Technical conditions and referenced standards

		Steel	Stainless steel
General technical requirements		GB/T 16938
Thread	Tolerances	6g for property class 8.8 and A2-70; 8g for all others
Thread	Standard	GB/T 196, GB/T 197
Mechanical properties	Class	Property classes 4.6, 4.8 and 8.8	A2-50, A2-70
Mechanical properties	Standard	GB/T 3098.1	GB/T 3098.6
Tolerances	Product grade	Product grade C applies except as specified in Clause 3.
Tolerances	Standard	GB/T 3103.1
Surface treatment		No treatment; Electroplating requirements in accordance with GB/T 5267.1; Hot-dip galvanizing requirements in accordance with GB/T 5267.3	Simple treatment
Surface treatment		Any other surface treatment shall be agreed between the purchaser and supplier.
Acceptance inspection and packaging		GB/T 90.1, GB/T 90.2

Product overview

Carriage bolts have a rounded head and a square neck that helps resist rotation when seated. This page uses GB/T 14-2013 mushroom head square neck bolts as the dimensional reference.

For a quote, share the thread diameter, nominal length and quantity. Include the required material, property class and surface finish if known.