Carriage, Square-Neck & Nib Bolts

Type A Reinforced Round Head Square Neck Bolts

GB/T 794-2021 (reference only)

Nominal size d

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GB/T 794-2021 dimension drawing

Dimensions in mm

Standard	Standard body

		Steel	Stainless steel
General technical requirements		GB/T 16938
Thread	Tolerances	Type A: 6g a; Type B: 8g a
Thread	Standard	GB/T 193, GB/T 9145, GB/T 9146
Mechanical properties	Class	Type A: Property class 8.8; Type B: Property classes 4.6 and 4.8	A2-50, A2-70, A4-70, A4-50
Mechanical properties	Standard	GB/T 3098.1	GB/T 3098.6
Tolerances	Product grade	Except as specified in Clause 4, product grade B applies to type A and product grade C to type B.
Tolerances	Standard	GB/T 3103.1
Surface treatment		No treatment (uncoated and unplated) ; Electroplating requirements in accordance with GB/T 5267.1; Non-electrolytically applied zinc flake coating requirements in accordance with GB/T 5267.2; Hot-dip galvanizing requirements in accordance with GB/T 5267.3	Simple treatment (cleaning and polishing) ; Passivation b
Surface treatment		Any other technical requirements or surface treatments shall be agreed between the purchaser and supplier.
Surface discontinuities		GB/T 5779.1
Acceptance inspection and packaging		GB/T 90.1, GB/T 90.2
		a Depending on the coating system selected, a different tolerance position may be required before coating. See GB/T 5267.1, GB/T 5267.2, GB/T 5267.3; b GB/T 5267.4 specifies passivation methods

A reinforced Type A cup head square neck bolt. Check the reinforced head and neck geometry against the drawing.

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