Square Head Bolt
Square Head Bolt
Square Head Bolt
Square Head Bolt
Square Head Bolt
Square Head Bolt
Square Head Bolt
Square Head Bolt
Square Head Bolt
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  • Description
  • Parameters
  • Application


MOQ: 500kgs
  • Product Features:

    Standard: ASME/ANSI B 18.2.1
    Size: 1/4”-3”
    Material: Carbon Steel, Alloy Steel, Stainless Steel, Brass
    Grade: SAE J429 Gr.2, 5,8; ASTM A307Gr.A, Class 4.8, 5.8, 6.8, 8.8, 10.9, 12.9
    Thread: M, UNC, UNF
    Finish: Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Chrome, H.D.G.
  • Website:

    www.jm-industry.com
  • Trade Term & Payment

    Trade Term:
    FOB/CIF/CFR/CNF/EXW/DDU/DDP
    Payment :
    T/T, L/C , D/A , D/P , Western Union,etc
  • Packaging Details:

    a. bulk in cartons (<=25kg )+ 36CTN/wood solid Pallet
    b. bulk in cartons 9"x9"x5" (<=18kg )+ 48CTN/wood solid Pallet
    c. according to customer special demand
  • Supply Ability & MOQ:

    1000 tons per month
    MinimumOrder:
    500kgs for each specification
  • Market:

    South&north Amrica/Europe/East&South east Asia/ Australia and ect.
ANSI/ASME standard DIN standard

Who We are?

  • Shanghai Jian & Mei Industry and Trade Co., Ltd. is well equipped with various multi-station cold heading machines and high-medium frequency heating machines imported from Taiwan. JM can manufacture all kinds of fasteners of various head types with the specifications from M6- M56,1/4-2”in diameter, 20-1500 (1”-60”) in length, from Class 4.8 to 12.9 and from A429 Grade 2-8.



Quality control

  • The production management of our company strictly complies with ISO9001:2008 system. All our products are subjected to strict test and inspection in each process by the workers periodically, starting from the raw materials delivered to the factory.


Test Report


Each batch of exported products are identified with a unique batch number in the Finished product testing report and steel mill raw material quality inspection report.




  • If you need, the test report form the third part is available




Square Head Bolt ANSI/ASME standard DIN standard

Nominal Size or Basic Product Diameter E F G H R LT
Full-size Body Diameter Width Across Flats Width Across Corners Head Height Radius of Fillet Thread Length for Bolt Lengths
6 in.and Shorter Over 6 in.
Max Min Basic Max Min Max Min Basic Max Min Max Nom Nom
1/4 0.2500 0.227 0.237 3/8 0.375 0.362 0.530 0.498 11/64 0.188 0.156 0.03 0.01 0.750 1.000
5/16 0.3125 0.324 0.298 1/2 0.500 0.484 0.707 0.665 13/64 0.220 0.186 0.03 0.01 0.875 1.125
3/8 0.3750 0.388 0.360 9/16 0.562 0.544 0.795 0.747 1/4 0.268 0.232 0.03 0.01 1.000 1.250
7/16 0.4375 0.452 0.421 5/8 0.625 0.603 0.884 0.828 19/64 0.316 0.278 0.03 0.01 1.125 1.375
1/2 0.5000 0.515 0.482 3/4 0.750 0.725 1.061 0.995 21/64 0.348 0.308 0.03 0.01 1.250 1.500
5/8 0.6250 0.642 0.605 15/16 0.938 0.906 1.326 1.244 27/64 0.444 0.400 0.06 0.02 1.500 1.750
3/4 0.7500 0.768 0.729 1-1/8 1.125 1.088 1.591 1.494 1/2 0.524 0.476 0.06 0.02 1.750 2.000
7/8 0.8750 0.895 0.852 1-5/16 1.312 1.269 1.856 1.742 19/32 0.620 0.568 0.06 0.02 2.000 2.250
1 1.0000 1.022 0.976 1-1/2 1.500 1.450 2.121 1.991 21/32 0.684 0.628 0.09 0.03 2.250 2.500
1-1/8 1.1250 1.149 1.098 1-11/16 1.688 1.631 2.386 2.239 3/4 0.780 0.720 0.09 0.03 2.500 2.750
1-1/4 1.2500 1.277 1.223 1-7/8 1.875 1.812 2.652 2.489 27/32 0.876 0.812 0.09 0.03 2.750 3.000
1 -3/8 1.3750 1.404 1.345 2-1/16 2.062 1.994 2.917 2.738 29/32 0.940 0.872 0.09 0.03 3.000 3.250
1-1/2 1.5000 1.531 1.470 2-1/4 2.250 2.175 3.182 2.986 1 1.036 0.964 0.09 0.03 3.250 3.500




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