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Click Specification

(Non-preferred) dimensions in parentheses.

Unit:mm

Semi-round Head Square Neck Bolts

GB 12 - 1976

Display drawing:

国标GB 12 - 1976 GB12 12GB Semi-round Head Square Neck 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.
Screw Thread
d
M6 M8 M10 M12 (M14) M16 M20
P Pitch
dk Nominal Size
max
min
k Nominal Size
max
min
s Nominal Size
max
min
k1 Nominal Size
max
min
r
1.00 1.25 1.50 1.75 2.00 2.00 2.50
12 16 20 24 28 32 40
13.1 17.1 21.3 25.3 29.3 33.6 41.6
11.3 15.3 19.16 23.16 27.16 31 39
3.6 4.8 6 8 9 10 12
4.08 5.28 6.48 8.9 9.9 10.9 13.1
3.2 4.4 5.6 7.55 8.55 9.55 11.45
6 8 10 12 14 16 20
6.3 8.36 10.36 12.43 14.43 16.43 20.52
5.84 7.8 9.8 11.76 13.76 15.76 19.72
4 5 6 8 9 10 12
4.4 5.4 6.4 8.45 9.45 10.45 12.55
3.6 4.6 5.6 7.55 8.55 9.55 11.45
7 9 11 13 15 18 22
Weight of per 1000 steel products(≈kg)
- - - - - - -
Length of Thread b
- - - - - - -

Alternative history

GB 12 - 1976 GB /T 12 - 1988 GB /T 12 - 2013

Suppliers

Best price if from GlobalFastener.com.
Suzhou Hanlinyu Precision Hardware Co., Ltd.

  • Amy Li

  • +86-13771867939

  • +86-512-65868465

  • Material: Carbon steel, Stainless steel; Grade: 8.8; Specifications: M6-M20
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1 Cup Head Square Neck Bolts [GB]
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