Shanghai Powermax Fastener Co., Ltd.
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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.
| Bolt Grades | |
| Type | Description |
| Grade A | Bolts with a minimum tensile strength of 60 ksi, intended for general purpose applications. |
| Grade B | Bolts with a tensile strength between 60 to 100 ksi and intended for flanged joints in piping systems. |
| Grade C | Replaced with ASTM F1554 Grade 36 Specification |
| Chemical Composition | ||
| Element | Grade A | Grade B |
| Carbon | 0.29 | 0.29 |
| Manganese, max | 1.2 | 1.2 |
| Phosphorus, max | 0.04 | 0.04 |
| Sulfur, max | 0.15 | 0.05 |
| Mechanical Properties | ||||
| Bolt Grade | Diameter, Inch | Tensile Strength, ksi | Elongation, % | Hardness, BHN |
| A | 1/4 to 4, Inclusive | 60 | 18 | 121 - 241 |
| B | 1/4 to 4, Inclusive | 60 - 100 | 18 | 121 - 212 |
| Recommended Nuts & Washers | |||
| Bolt Specification | Bolting Diameter, Inch | Nut Specification | Washer Specification |
| A307 Grade A | 1/4 to 4, Inclusive | ASTM A563 Grade A | ASTM F844 |
| A307 Grade B | |||