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Hdg Din933 Hex Head Bolt Hot Dipped Galvanized

  • Standard: DIN933
  • Product Name: Hex Head Bolt Hot dipped galvanized
  • Key Words: DIN 933, HDG
  • Size: M3-M42
  • Material: SUS304, SUS316
  • Stength Grade: 4.8, 5.8, 6.8, 8.8
  • Surface Treatment: Plain
  • Thread Length: Full Thread/ Half Thread
  • Thread Type: Coarse/Fine
  • Packing: Carton/Wooden case
  • Other Features: Offer customized head mark

Production parameter

Hdg Din933 Hex Head Bolt Hot Dipped Galvanized (6)2lj
Thread size
d
M12 M16 M20 M22 M24 M30
P pitch 1.75 2 2.5 2.5 3 3.5
ds Max 12.7 16.7 20.84 22.84 24.84 30.84
Min 11.3 15.3 19.16 21.16 23.16 29.16
s Max 18 24 30 34 36 46
Min 17.57 23.16 29.16 33 35 45
e Max 20.7 27.7 34.6 39.3 41.6 53.1
Min 19.85 26.17 32.95 37.29 39.55 50.85
dw Min 16.5 22 27.7 31.35 33.2 42.7
c Max 0.6 0.8 0.8 0.8 0.8 0.8
Min 0.15 0.2 0.2 0.2 0.2 0.2
da Max 14.7 18.7 24.4 26.4 28.4 35.4
r Min 0.6 0.6 0.8 0.8 0.8 1
k Max 7.95 10.75 13.4 14.9 15.9 19.75
Min 7.05 9.25 11.6 13.1 14.1 17.65
b Single nut bolt according to d + 9 d + 9 d + 8 d + 9 d + 7 d + 6
nominal 21 25 28 31 31 36
Double nut bolt according to 1.8d + 9 1.8d + 10 1.8d + 10 1.8d + 13 1.8d + 11 1.8d + 8
nominal 30.6 38.8 46 52.6 54.2 62

Production description

HDG generally refers to hot-dip galvanizing. Hot-dip galvanizing is to make the molten metal react with the iron matrix to produce an alloy layer, so that the matrix and the coating are combined. Hot-dip galvanizing is to pickle the iron and steel parts first, in order to remove the iron oxide on the surface of the iron and steel parts, after pickling, it is cleaned in a tank of ammonium chloride or zinc chloride aqueous solution or a mixed aqueous solution of ammonium chloride and zinc chloride, and then sent to the hot dip coating tank. Hot-dip galvanizing has the advantages of uniform coating, strong adhesion and long service life.

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The countersunk head of hot dip galvanized bolts is usually used where the connection is required. It is a non-standard part in the shape of a U and is therefore also known as a U-bolt. Hot-dip galvanized bolts with threads at both ends can be used in combination with nuts. The utility model is mainly used for fixing tubular or flaky objects.

The corrosion resistance is mainly determined by the thickness of the galvanized layer, so the thickness measurement is often the main basis for judging the quality of the galvanized layer. The angle and speed of the solution also have a great influence. Therefore, it is practically impossible to obtain a completely uniform coating thickness. 

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