ASTM A193 B8M bolts are high-quality fasteners widely used in various industrial applications. These bolts are made of stainless steel, specifically the B8M grade, which offers excellent corrosion resistance and high strength.
Product Parameters
|
Drive Style |
Heavy Hex Head Bolts |
|
Screw Features |
Heavy Hex |
|
System of Measurement |
Metric |
|
Thread Direction |
Right Hand |
|
Threading |
Fully threaded |
|
Thread Fit |
Class 6g |
|
Thread Spacing |
Coarse |
|
Grade/Class |
ASTM A193 B8M |
|
Material |
Stainless steel 316 |
|
Standard |
ASME B18.2.3.3M |
|
Finish |
Carbide solution |
|
RoHS |
RoHS 3 (2015/863/EU) Compliant |
|
Country of Origin |
China |
Product Drawing
|
Metric heavy hex screws |
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|
ASME/ANSI B18.2.3.3M |
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|
d(mm) |
P(mm) |
b(mm) |
ds(mm) |
k(mm) |
s(mm) |
|||||
|
L≤125 |
125<L≤200 |
L>200 |
min |
max |
min |
max |
min |
max |
||
|
M12 |
1.75 |
30 |
36 |
49 |
11.73 |
12 |
7.24 |
7.76 |
20.67 |
21 |
|
M14 |
2 |
34 |
40 |
53 |
13.73 |
14 |
8.51 |
9.09 |
23.67 |
24 |
|
M16 |
2 |
38 |
44 |
57 |
15.73 |
16 |
9.68 |
10.32 |
26.67 |
27 |
|
M20 |
2.5 |
46 |
52 |
65 |
19.67 |
20 |
12.12 |
12.88 |
33 |
34 |
|
M24 |
3 |
54 |
60 |
73 |
23.67 |
24 |
14.56 |
15.44 |
40 |
41 |
|
M30 |
3.5 |
66 |
72 |
85 |
29.67 |
30 |
17.92 |
19.48 |
49 |
50 |
|
M36 |
4 |
78 |
84 |
97 |
35.61 |
36 |
21.72 |
23.38 |
58.8 |
60 |
Manufacturing and Quality Control
Forming process: Hot working (forging/rolling at 1100–1150°C to ensure sufficient austenitization) or cold working (cold heading at room temperature to improve surface precision). Stress relief treatment is required after cold working.
Heat treatment: The core process is solution annealing (heating to 1010–1150°C followed by rapid water cooling), which dissolves carbides, homogenizes the structure, and maximizes corrosion resistance. In some cases, stabilization treatment (e.g., when titanium or niobium is present) is added to prevent intergranular corrosion.
Surface treatment: Common methods include passivation (forming an oxide film to enhance corrosion resistance) and mechanical polishing (improving surface finish and reducing adhesion of corrosive media). For special requirements, secondary protection such as nickel plating or PTFE coating may be applied.
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