About Socket Head Screws
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About Hex Head Screws and Bolts
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Medium-Strength Grade 5 Steel Hex Head Screws
Twice as strong as low-strength steel screws, these Grade 5 screws are suitable for fastening most machinery and equipment. For quick identification, their heads are marked with three radial lines. All screws meet ASME B18.2.1, which means they’re made to strict dimensional standards. They also meet either ASTM A449 or SAE J429 standards for material quality. Length is measured from under the head.
Steel screws are best for dry environments, since moisture will cause them to rust. They require little surface prep before applying a finish, so you can apply your own paint or coating.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch.
High-Strength Grade 8 Steel Hex Head Screws
Made from Grade 8 steel, these screws can be used in high-stress applications, such as valves, pumps, motors, and automotive suspension systems. They are at least 25% stronger than medium-strength steel screws. For quick identification, their head is marked with six radial lines. Length is measured from under the head.
Steel screws are best for dry environments, since moisture will cause them to rust. They require little surface prep before applying a finish, so you can apply your own paint or coating.
Match the thread spacing of mating components. Coarse threads are the industry standard; choose these screws if you don’t know the threads per inch. Screws that meet ASME specifications are made to strict dimensional standards.
Head | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing  | Wd. | Ht. | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
Grade 8 Steel | ||||||||||
2"-4 1/2 | ||||||||||
| 8" | Partially Threaded | 4 1/2" | Coarse | 3" | 1 7/32" | 150,000 | ASME B18.2.1, ASTM A354BD | 1 | 000000000 | 000000 |
| 9" | Partially Threaded | 4 1/2" | Coarse | 3" | 1 7/32" | 150,000 | ASME B18.2.1, ASTM A354BD | 1 | 000000000 | 000000 |
| 10" | Partially Threaded | 4 1/2" | Coarse | 3" | 1 7/32" | 150,000 | ASME B18.2.1, ASTM A354BD | 1 | 000000000 | 00000 |
Alloy Steel Socket Head Screws
With a tensile strength of 170,000 psi, these alloy steel screws are stronger than Grade 8 steel screws. Length is measured from under the head.
Black-oxide steel screws are mildly corrosion resistant in dry environments.
Coarse threads are the industry standard; choose these screws if you don’t know the pitch or threads per inch.
Screws that meet ASTM A574, ASTM A574M, and ISO 898-1 comply with specifications and testing requirements for material quality.
Head | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| Lg. | Threading | Min. Thread Lg. | Thread Spacing | Dia. | Ht. | Drive Size | Tensile Strength, psi | Specifications Met | Pkg. Qty. | Pkg. | |
2"-4 1/2 | |||||||||||
Black-Oxide Alloy Steel | |||||||||||
| 4" | Fully Threaded | __ | Coarse | 3" | 2" | 1 1/2" | 170,000 | ASTM A574 | 1 | 000000000 | 0000000 |
| 6" | Partially Threaded | 5" | Coarse | 3" | 2" | 1 1/2" | 170,000 | ASTM A574 | 1 | 000000000 | 000000 |
| 8" | Partially Threaded | 5" | Coarse | 3" | 2" | 1 1/2" | 170,000 | ASTM A574 | 1 | 000000000 | 000000 |
| 10" | Partially Threaded | 5" | Coarse | 3" | 2" | 1 1/2" | 170,000 | ASTM A574 | 1 | 000000000 | 000000 |