ASTM A563 Heavy Hex Structural Bolts
Black finish ASTM A563 Grade A hex nut with heavy hex structural bolts A307 GRADE B
Heavy hex bolts have a head that is larger than a standard (finish) hex head. Standard heavy hex structural bolts are made of low to mid carbon steel. The large head offers a greater bearing surface that distributes the clamping load over a greater area.
The ASTM A307 specification covers carbon steel bolts and studs ranging from 1/4" through 4" diameter. This is your everyday, run of the mill bolt specification often manufactured using A36 round bar. There are three grades A, B, and C which denote tensile strength, configuration, and application.
SIZE: 1/4" - 1.1//2", M6 -M36. And 600mm Max length.
STANDARD: ASME B18.2.6
THREAD: ASME B1.1 , UNC, UNF, CLASS 2A
FINISHED: Plain, Zinc Plated(Clear/Blue/Yellow/Black), Black oxide, Nickel, Dacromet, H.D.G.
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Bolt Grades |
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Type |
Description |
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Grade A |
Bolts with a minimum tensile strength of 60 ksi, intended for general purpose applications. |
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Grade B |
Bolts with a tensile strength between 60 to 100 ksi and intended for flanged joints in piping systems. |
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Grade C |
Replaced with ASTM F1554 Grade 36 Specification |
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Chemical Composition |
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Element |
Grade A |
Grade B |
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Carbon |
0.29 |
0.29 |
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Manganese, max |
1.2 |
1.2 |
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Phosphorus, max |
0.04 |
0.04 |
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Sulfur, max |
0.15 |
0.05 |
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Mechanical Properties |
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Bolt Grade |
Diameter, Inch |
Tensile Strength, ksi |
Elongation, % |
Hardness, BHN |
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A |
1/4 to 4, Inclusive |
60 |
18 |
121 - 241 |
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B |
1/4 to 4, Inclusive |
60 - 100 |
18 |
121 - 212 |
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Recommended Nuts & Washers |
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Bolt Specification |
Bolting Diameter, Inch |
Nut Specification |
Washer Specification |
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A307 Grade A |
1/4 to 4, Inclusive |
ASTM A563 Grade A |
ASTM F844 |
| A307 Grade B | |||
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