ASTM A193 Grade B7 heavy hex bolts are made of alloy steel and heat-treated to achieve the required strength and hardness. They are mainly used in industries such as oil and gas, power generation, and petrochemicals, as well as other critical structural and mechanical applications. The ASTM A193 standard specifies requirements for fasteners used in high-pressure and high-temperature environments, and Grade B7 is one of the most commonly used grades in such applications.
Product Parameters
|
Drive Style |
Heavy Hex Head Bolts |
|
Screw Features |
Heavy Hex |
|
System of Measurement |
Inch |
|
Thread Direction |
Right Hand |
|
Threading |
Fully threaded |
|
Thread Fit |
Class 2A |
|
Thread Spacing |
Coarse |
|
Grade/Class |
ASTM A193 B7 |
|
Material |
Alloy steel |
|
Standard |
ASME B18.2.1 Table 7 |
|
Finish |
HDG |
|
RoHS |
RoHS 3 (2015/863/EU) Compliant |
|
Country of Origin |
China |
Product Drawing
|
Heavy Hex Screws/Hex Bolts |
||||||||
|
ASME/ANSI B18.2.1-2010 Table7 |
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|
|
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|
d(inch) |
ds(inch) |
s((inch) |
k(inch) |
b(inch) |
||||
|
min |
max |
min |
max |
min |
max |
L≤6 |
L>6 |
|
|
3/8 |
0.36 |
0.375 |
0.669 |
0.688 |
0.226 |
0.243 |
1 |
1.25 |
|
1/2 |
0.482 |
0.5 |
0.85 |
0.875 |
0.302 |
0.323 |
1.25 |
1.5 |
|
5/8 |
0.605 |
0.625 |
1.031 |
1.062 |
0.378 |
0.403 |
1.5 |
1.75 |
|
3/4 |
0.729 |
0.75 |
1.212 |
1.25 |
0.455 |
0.483 |
1.75 |
2 |
|
7/8 |
0.852 |
0.875 |
1.394 |
1.438 |
0.531 |
0.563 |
2 |
2.25 |
|
1 |
0.976 |
1 |
1.575 |
1.625 |
0.591 |
0.627 |
2.25 |
2.5 |
|
1-1/8 |
1.098 |
1.125 |
1.756 |
1.812 |
0.658 |
0.718 |
2.5 |
2.75 |
|
1-1/4 |
1.223 |
1.25 |
1.938 |
2 |
0.749 |
0.813 |
2.75 |
3 |
|
1-3/8 |
1.345 |
1.375 |
2.119 |
2.188 |
0.81 |
0.878 |
3 |
3.25 |
|
1-1/2 |
1.47 |
1.5 |
2.3 |
2.375 |
0.902 |
0.974 |
3.25 |
3.5 |
|
1-5/8 |
1.591 |
1.625 |
2.481 |
2.562 |
0.962 |
1.038 |
3.5 |
3.75 |
|
1-3/4 |
1.716 |
1.75 |
2.662 |
2.75 |
1.054 |
1.134 |
3.75 |
4 |
|
1-7/8 |
1.839 |
1.875 |
2.844 |
2.938 |
1.114 |
1.198 |
4 |
4.25 |
|
2 |
1.964 |
2 |
3.025 |
3.125 |
1.175 |
1.263 |
4.25 |
4.5 |
|
2-1/4 |
2.214 |
2.25 |
3.388 |
3.5 |
1.327 |
1.423 |
/ |
5 |
|
2-1/2 |
2.461 |
2.5 |
3.75 |
3.875 |
1.479 |
1.583 |
/ |
5.5 |
|
2-3/4 |
2.711 |
2.75 |
4.112 |
4.25 |
1.632 |
1.744 |
/ |
6 |
|
3 |
2.961 |
3 |
4.475 |
4.625 |
1.815 |
1.935 |
/ |
6.5 |
|
3-1/4 |
3.21 |
3.25 |
4.838 |
5 |
1.998 |
2.126 |
/ |
7 |
|
3-1/2 |
3.461 |
3.5 |
5.2 |
5.375 |
2.12 |
2.256 |
/ |
7.5 |
|
3-3/4 |
3.7109 |
3.75 |
5.562 |
5.75 |
2.303 |
2.447 |
/ |
8 |
|
4 |
3.9609 |
4 |
5.925 |
6.125 |
2.424 |
2.576 |
/ |
8.5 |
|
4-1/4 |
4.2228 |
4.25 |
6.288 |
6.5 |
2.608 |
2.768 |
/ |
9 |
|
4-1/2 |
4.4727 |
4.5 |
6.65 |
6.875 |
2.728 |
2.896 |
/ |
9.5 |
|
4-3/4 |
4.7227 |
4.75 |
7.012 |
7.25 |
2.912 |
3.088 |
/ |
10 |
|
5 |
4.9726 |
5 |
7.375 |
7.625 |
3.033 |
3.127 |
/ |
10.5 |
|
5-1/4 |
5.2226 |
5.25 |
7.738 |
8 |
3.216 |
3.408 |
/ |
11 |
|
5-1/2 |
5.4726 |
5.5 |
8.1 |
8.375 |
3.338 |
3.538 |
/ |
11.5 |
|
5-3/4 |
5.7225 |
5.75 |
8.462 |
8.75 |
3.521 |
3.729 |
/ |
12 |
|
6 |
5.9725 |
6 |
8.825 |
9.125 |
3.642 |
3.858 |
/ |
12.5 |
Product Features
1. High strength: Suitable for high-pressure and high-temperature environments.
2. Corrosion resistance: Available with hot-dip galvanizing surface treatment.
3. Wide applicability: Suitable for petrochemicals, pressure vessels, pipeline flange connections, etc.
Installation & Safety
1. Torque Specifications:
When installing ASTM A193 Grade B7 bolts, it is important to follow the correct torque specifications to ensure proper tightening. Incorrect torque can result in under-tightening (causing a loose connection) or over-tightening (damaging the bolt or the material being fastened).
2. Thread Lubrication:
For high-temperature or high-pressure applications, bolt threads may require lubrication to reduce friction and prevent thread galling (sticking), which can cause difficulties during installation or removal.
3. Inspection:
Regular inspection is recommended, especially for bolts used in critical, high-stress applications. Inspect the bolt threads and head for signs of wear, deformation, or damage.
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