Black Oxide DIN6921 GB5787 ASME B18.2.1.8 Hex Flange Bolts
Basic Info
Material | Carbon Steel | Type | Hexagon Head |
Surface | Black Oxide | Connection Method | Flanged |
OEM/ODM | We accept OEM/ODM | Specification | M5-M20 |
Standard | GB5789/GB5787/DIN6921 | Trademark | Grand |
Thread specification | M5 | M6 | M8 | M10 | M12 | M14 | M16 | M20 | |
b | L≤120 | 16 | 18 | 22 | 26 | 30 | 34 | 38 | 46 |
120＜L≤120 | —— | —— | 28 | 32 | 36 | 40 | 44 | 52 | |
dc max | 11.8 | 14.2 | 18 | 22.3 | 26.6 | 30.5 | 35 | 43 | |
k max | 5.4 | 6.5 | 8.1 | 9.2 | 10.4 | 12.4 | 14.1 | 17.7 | |
s | max | 8 | 10 | 13 | 15 | 18 | 21 | 24 | 30 |
min | 7.64 | 9.64 | 12.57 | 14.57 | 17.57 | 20.16 | 23.16 | 29.16 | |
ds | max | 5 | 6 | 8 | 10 | 12 | 14 | 16 | 20 |
min | 4.82 | 5.82 | 7.78 | 9.78 | 11.73 | 13.73 | 15.73 | 19.67 | |
Flange bolts are a common connecting element, usually used to connect flanges to pipes, valves and other equipment.Blackening and oxidizing treatment is a kind of surface treatment process, through the blackening and oxidizing treatment of flange bolts, it can improve its corrosion resistance and aesthetics.
Strengths：
The blackened and oxidized flange bolts have significant improvement in corrosion resistance, which can effectively extend the service life; and they are more beautiful in appearance, which improves the overall grade of the equipment.
Material:
flange bolts are usually made of carbon steel, alloy steel and other materials, after blackening and oxidizing treatment can form a layer of dense oxide film, which enhances its corrosion resistance.
·Plating:
One of the features of blue and white zinc flange bolts is their blue and white zinc plating. The coating is applied to the surface of the bolt by electroplating, which can effectively prevent oxidation, corrosion and wear. The blue-white zinc coating has good appearance, uniform thickness and excellent anti-corrosion properties.
Application:
Black oxidized flange bolts are widely used in the chemical industry, petroleum, shipbuilding, electric power and other fields of equipment connection, as well as need to have a certain degree of aesthetic requirements of the occasion.