Carriage, Square-Neck & Nib Bolts

Small-Head Carriage Bolts

GB/T 12-2013 (reference only)

Nominal size d

Request a quote ↗

GB/T 12-2013 dimension drawing

Dimensions in mm

Standard	Standard body

		Steel	Stainless steel
General technical requirements		GB/T 16938
Thread	Tolerances	A2-70 shall be 6g; all others shall be 8g
Thread	Standard	GB/T 196, GB/T 197
Mechanical properties	Class	Property classes 4.6 and 4.8	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	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

Round head square neck bolts to GB/T 12-2013. Specify head diameter, square neck dimensions and nominal length when requesting a quote.

For a quote, share the required dimensions, finish and quantity.