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(Non-preferred) dimensions in parentheses.

Unit:mm

High Strength Bolts with Large Hexagon Head Assemblies for Steel Structures

GB /T 1231 (bolt) - 2024

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国标GB /T1231 (bolt) - 2024 GB1231 1231GB High Strength Bolts with Large Hexagon Head Assemblies for Steel Structures
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
M12 M16 M20 (M22) M24 (M27) M30 (M33) M36
P Pitch
c max
min
da max
ds max
min
dw min
e min
k Nominal Size
max
min
k1 min
r min
s max
min
1.75 2 2.5 2.5 3 3 3.5 3.5 4
0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8 0.8
0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4 0.4
15.23 19.23 24.32 26.32 28.32 32.84 35.84 39.84 42.84
12.43 16.43 20.52 22.52 24.52 27.84 30.84 34 37
11.57 15.57 19.48 21.48 23.48 26.16 29.16 32 35
19.2 24.9 31.4 33.3 38.0 42.8 46.5 51.1 55.9
22.78 29.56 37.29 39.55 45.2 50.85 55.37 60.79 66.44
7.5 10 12.5 14 15 17 18.7 21 22.5
7.95 10.75 13.4 14.9 15.9 17.9 19.75 22.05 23.55
7.05 9.25 11.6 13.1 14.1 16.1 17.65 19.95 21.45
4.9 6.5 8.1 9.2 9.9 11.3 12.4 13.97 15.02
1.0 1.0 1.5 1.5 1.5 2.0 2.0 2.5 2.5
21 27 34 36 41 46 50 55 60
20.16 26.16 33 35 40 45 49 53.8 58.8
Weight of per 1000 steel products(≈kg)
- - - - - - - - -
Length of Thread b
- - - - - - - - -
②,The dimensions in the table are all uncoated dimensions.

Alternative history

GB /T 1228 - 1991 GB /T 1228 - 2006 GB /T 1231bolt - 2024
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