GB 21 - 1976 Small Hexagon Head Bolts

Unit: 毫米(mm)

Thread Size
d

M10

M12

per 1000 units ≈ kg(7.85kg/cm3)

Thread Length
b

Bolts, Small Hexagon Head with Fit Neck

Small Hexagon Head Bolts, Finished

Small Hexagon Bead Bolt, Semi-Finished

Small Hexagon Head Bolts, Finished [Annex Attached Table 2.1]

Small Hexagon Head Bolts, Semifinished [Annex Attached Table 2.2.]

Hexagon Bolts with Small Widths Across Flats

Small Hexagon Head Bolts with Thread Approximately To Head, Small Widths Across Flats

Product Grade A Fit Bolts with Hexagon Reduced Head

Hexagon Bolts with Reduced Head and Guide Neck, Precision Class B, Type 1

Hexagon Bolts with Reduced Head and Guide Neck, Precision Class B, Type 2

Hexagon Bolts with Reduced Head and Guide Neck, Precision Class B, Type 3

Hexagon Bolts with Reduced Head and Guide Neck, Precision Class B, Type 4

Hexagon Bolts with Reduced Head and Guide Neck, Precision Class B, Type 5

Hexagon Reduced Head Bolts with Guide Neck Product Grade A, Type 1

Hexagon Reduced Head Bolts with Guide Neck Product Grade A, Type 2

Hexagon Reduced Head Bolts with Guide Neck Product Grade A, Type 3

Hexagon Reduced Head Bolts with Guide Neck Product Grade A, Type 4

Hexagon Reduced Head Bolts with Guide Neck Product Grade A, Type 5

Reduced Hexagon - Head Bolts, Short Thread, Shank Tolerance h8

GB	GB /T 5785
ISO	ISO 8765
DIN	DIN EN ISO 8765
Some of the above standards may be approximate equivalent. If there is any objection, the standard original shall prevail.

Ningbo SiTuo Fastener Co., Ltd
Contact:	Petty Cao
Cellphone：	86-15381997760
email：	silany_1122@163.com
Material: carbon steel, stainless steel; Grade: 4.8, 8.8, 10.9, 12.9; Surface treatment: according to customer requirements; Complete specifications, non-standard customization.