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8.8 10.9 12.9 High strength bolts, black large hexagonal bolts

  • Standard: DIN6921
  • Product name: High strength bolts
  • Keywords: DIN6921,  high-strength bolts
  • Size: M3-M42
  • Materials: 45 #, 35K, 10B21, 40Cr, 35CrMo
  • Strength levels: 8.8, 10.9, 12.9
  • Surface treatment: black oxide
  • Thread length: full thread/half thread
  • Thread type: coarse/fine
  • Packaging: bags/cardboard boxes/wooden boxes
  • Other features: Provide customized header tags

Production parameter

8ghe
thread specification
d
(M39) M42 (M45) M48 (M52) M56 M64
P pitch 4 4.5 4.5 5 5 5.5 6
b reference 68 74 76 82 85 90 100
c Min 0.5 0.5 0.5 0.5 0.5 0.5 0.5
Max 1 1 1 1 1 1 1
da Max 45 48 52 55 60 64.2 73.2
ds nominal 39 42 45 48 52 56 64
Min 38 41 44 47 51 54.8 62.8
Max 40 43 46 49 53 57.2 65.2
dw Min 60 64.7 69.45 74.2 78.8 83.4 92.9
e Min 71.3 76.95 82.6 88.25 93.79 99.2 110.5
k nominal 25 26 28 30 33 35 40
Min 23.95 24.95 26.95 28.95 31.75 33.75 38.75
Max 26.05 27.05 29.05 31.05 34.25 36.25 41.25
k1 Min 16.76 17.46 18.86 20.26 22.23 23.63 27.13
r Min 2.5 2.5 3 3 3.5 3.5 4
s Max=nominal 65 70 75 80 85 90 100
Min 63.1 68.1 73.1 78.1 83 87.8 97.8
Thread b - - - - - - -

Production description

Bolts made of high-strength steel or requiring significant pre tightening force can be referred to as high-strength bolts. High strength bolts are commonly used for connecting bridges, steel rails, high-voltage and ultra-high voltage equipment. The fracture of this type of bolt is mostly brittle fracture. High strength bolts applied to ultra-high pressure equipment require significant prestressing to ensure the sealing of the container.

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Some concepts about high strength bolts

According to the provisions of the bolt performance grade in 8.8 or above, known as high-strength bolts. As of March 2020, China's national standard only listed to M68. For large size specifications, especially the length of the bolt itself 10 ~ 15 times of high-strength bolts, finished products are rare, a small number of domestic manufacturers in China can be customized. [1-2][3] high-strength bolt and ordinary bolt difference: high-strength bolt is able to withstand the load than the same specification of ordinary bolt to be greater. The material of ordinary bolts is made of Q235(A3) . High strength bolt material 35 # steel or other high-quality materials, made after heat treatment, improve the strength.

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