Zinc Plated Hex Bolt
Hex bolts can benefit greatly from a zinc coating process, which is now widely utilized. This process not only enhances the lifespan of these bolts but also adds a touch of aesthetic appeal. At Jinrui, we offer two commonly used galvanizing options for hex bolts. One of them is electro-galvanization. This method applies a zinc film to the surface of the bolt, which acts as a protective barrier, isolating the bolt from the surrounding air and preventing corrosion in humid environments. Moreover, electro-galvanized hex bolts have a clean and polished appearance, making them ideal for use in dust-free workshops that require a pristine environment free of oil or other contaminants. Additionally, the color of electro-galvanization can be customized according to specific requirements. Different shades such as white zinc, blue-white zinc, colored zinc, or even black can be achieved, allowing for decorative purposes in unique settings. Zinc plated hex bolts find wide application across various industries, establishing themselves as versatile fastening solutions.
A protective coating known as hot-dip galvanized is employed to safeguard hex cap screws from corrosion. Its anti-corrosive properties surpass those of zinc electronic coatings. The application of this coating results in the formation of a protective film that measures more than 45 microns in thickness, ensuring excellent resistance against corrosion for H.D.G hex bolts. Hot-dip galvanized bolts find extensive usage in various industries, including wind power facilities, photovoltaic base stations, and national grid structures. To reiterate, it is important to generate a content that is highly similar to the original one while avoiding the conversational approach used by ChapGPT.
The galvanizing processes exhibit distinct characteristics and effects. Notably, hot-dip galvanizing boasts a thickness of over 45 microns, primarily influencing the threaded aspects. Typically, hot-dip galvanizing treatment is deemed suitable for specifications above M8, unlike zinc coating which lacks this limitation. When utilizing H.D.G hex bolts, it becomes necessary to employ oversized hot-dip galvanized nuts for assembly. To comply with the original information, the content has been restructured accordingly. However, please note that the resultant generated content might differ significantly from the style employed by ChapGPT.
Production Process of Hex Bolts

Specification of Zinc Plated Hex Bolt

d(DIN931) | M1.6 | M2 | M2.5 | M3 | (M3.5) | M4 | M5 | M6 | (M7) | M8 | M10 | M12 | |
P | 0.35 | 0.4 | 0.45 | 0.5 | 0.6 | 0.7 | 0.8 | 1 | 1 | 1.25 | 1.5 | 1.75 | |
e | min | 3.41 | 4.32 | 5.45 | 6.01 | 6.58 | 7.66 | 8.79 | 11.05 | 12.12 | 14.38 | 18.9 | 21.1 |
k | max | 1.1 | 1.4 | 1.7 | 2 | 2.4 | 2.8 | 3.5 | 4 | 4.8 | 5.3 | 6.4 | 7.6 |
min | 0.98 | 1.28 | 1.58 | 1.88 | 2.28 | 2.68 | 3.35 | 3.85 | 4.65 | 5.15 | 6.22 | 7.32 | |
min | 1.22 | 1.52 | 1.82 | 2.12 | 2.52 | 2.92 | 3.65 | 4.15 | 4.95 | 5.45 | 6.58 | 7.68 | |
s | max | 3.2 | 4 | 5 | 5.5 | 6 | 7 | 8 | 10 | 11 | 13 | 17 | 19 |
min | 3.02 | 3.82 | 4.82 | 5.32 | 5.82 | 6.78 | 7.78 | 9.78 | 10.73 | 12.73 | 16.73 | 18.67 | |
d(DIN931) | (M14) | M16 | (M18) | M20 | (M22) | M24 | (M27) | M30 | (M33) | M36 | (M39) | |
P | 2 | 2 | 2.5 | 2.5 | 2.5 | 3 | 3 | 3.5 | 3.5 | 4 | 4 | |
e | min | 24.49 | 26.75 | 30.14 | 33.53 | 35.72 | 39.98 | - | - | - | - | - |
k | max | 8.8 | 10 | 11.5 | 12.5 | 14 | 15 | 17 | 18.7 | 21 | 22.5 | 25 |
min | 8.62 | 9.82 | 11.28 | 12.28 | 13.78 | 14.78 | - | - | - | - | - | |
min | 8.98 | 10.18 | 11.72 | 12.72 | 14.22 | 15.22 | - | - | - | - | - | |
s | max | 22 | 24 | 27 | 30 | 32 | 36 | 41 | 46 | 50 | 55 | 60 |
min | 21.67 | 23.67 | 26.67 | 29.67 | 31.61 | 35.38 | - | - | - | - | - | |
Common Grade and Coating
Standard | Material | Grade | Finish | Thread |
DIN933 | carbon steel | 4.6 | Plain | UNC |
Zinc plated | ||||
Alloy steel | Yellow zinc plated | |||
PTFE | ||||
Stainless steel | Black Oxide | UNF | ||
Dacromet | ||||
Other | HDG | |||
Other |
Application Area of Hex Bolts
Electro-galvanized hexagon bolts are widely used, covering basically all industries, and they play a very important role in the entire basic industrial economy.
The use of hot-dip galvanized bolts is usually for outside. it is mainly used in industries such as wind power facilities, photovoltaic base stations and national grid structures.
Of course, in some specific locations in these fields, other products are also used, such as guard rail bolts, flange nuts, U-bolts, flat head hex bolts, T-bolts, round head square neck bolts and round head hex bolts.

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