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Click Specification

(Non-preferred) dimensions in parentheses.

Unit:mm

Small hexagon head bolts

GB 21 - 1976

Display drawing:

国标GB 21 - 1976 GB21 21GB Small hexagon head bolts
Download CAD Model*

 *Models with different eras.

Calculate weight and price. Weight 1000 pcs : kg x $ per kg = $ 1000 pcs
Default density g/cm3
×

Choose materials based on density.(g/cm3)

  • Carbon Steel 7.85
  • Stainless Steel 8.1
  • Stainless Steel 7.95
  • Stainless Steel 7.7
  • Titanium Alloy 4.5
  • Aluminum Alloy 2.8
  • Copper 8.89


Select here or enter material density on the calculation page.
Nominal Length L Tips:seclect Nominal Length L and get Weight Thread length.
Thread Size
d
M8 M10 M12 (M14) M16 (M18) M20 (M22) M24 (M27) M30 M36 M42 M48
P Pitch
s max
min
k Nominal Size
max
min
e
r
1.25 1.5 1.75 2 2 2.5 2.5 2.5 3 3 3.5 3.5 4.5 5
12 14 17 19 22 24 27 30 32 36 41 50 55 65
11.76 13.76 16.76 18.72 21.72 23.72 26.72 29.72 31.66 35.66 40.66 49.66 54.6 64.6
5 6 7 8 9 10 11 12 13 15 17 20 23 26
5.24 6.24 7.29 8.29 9.29 10.29 11.35 12.35 13.35 15.35 17.35 20.42 23.42 26.42
4.76 5.76 6.71 7.71 8.71 9.71 10.65 11.65 12.65 14.65 16.65 19.58 22.58 25.58
13.8 16.2 19.6 21.9 25.4 27.7 31.2 34.6 36.9 41.6 47.3 57.7 63.5 75
0.4 0.4 0.6 0.6 0.6 1 1 1 1 1 1 1.5 1.5 1.5
Weight of per 1000 steel products(≈kg)
- - - - - - - - - - - - - -
Length of Thread b
- - - - - - - - - - - - - -

Alternative history

GB 21 - 1976 GB 5785 - 1985 GB /T 5785 - 2000 GB /T 5785 - 2016

Suppliers

Best price if from GlobalFastener.com.
Ningbo SiTuo Fastener Co., Ltd

  • Petty Cao

  • +86-15381997760

  • 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.
Contact us via Email

Similar Standards

1 Small Hexagon Head Bolts (finished) [JIS]
JIS B 1180 (AT2.1) - 2004 		Small Hexagon Head Bolts (finished)
2 Small hexagon head bolts, finished [JIS]
JIS B 1180 (AT2.1) - 1994 		Small hexagon head bolts, finished
3 Small hexagon bead bolt (Semi-finished) [JIS]
JIS B 1180 (AT2.2) - 2004 		Small hexagon bead bolt (Semi-finished)
4 Small hexagon head bolts, semifinished [JIS]
JIS B 1180 (AT2.2) - 1994 		Small hexagon head bolts, semifinished
5 Bolts, small hexagon head with fit neck [GB]
GB 22 - 1976 		Bolts, small hexagon head with fit neck
6 Product Grade A Fit Bolts With Hexagon Reduced Head [GOST]
GOST 7817 - 1980 		Product Grade A Fit Bolts With Hexagon Reduced Head
7 Hexagon reduced head bolts with guide neck product grade A , Type 1 [GOST]
GOST 7811 (-1) - 1970 		Hexagon reduced head bolts with guide neck product grade A , Type 1
8 Hexagon reduced head bolts with guide neck product grade A , Type 2 [GOST]
GOST 7811 (-2) - 1970 		Hexagon reduced head bolts with guide neck product grade A , Type 2
9 Hexagon reduced head bolts with guide neck product grade A , Type 3 [GOST]
GOST 7811 (-3) - 1970 		Hexagon reduced head bolts with guide neck product grade A , Type 3
10 Hexagon reduced head bolts with guide neck product grade A , Type 4 [GOST]
GOST 7811 (-4) - 1970 		Hexagon reduced head bolts with guide neck product grade A , Type 4
11 Hexagon reduced head bolts with guide neck product grade A , Type 5 [GOST]
GOST 7811 (-5) - 1970 		Hexagon reduced head bolts with guide neck product grade A , Type 5
12 Hexagon Bolts With Small Widths Across Flats [CNS]
CNS 3120 - 1987 		Hexagon Bolts With Small Widths Across Flats
13 Small Hexagon Head Bolts With Thread Approximately To Head, Small Widths Across Flats [CNS]
CNS 4700 - 1987 		Small Hexagon Head Bolts With Thread Approximately To Head, Small Widths Across Flats