S-91465A218 5/8"-11 x 3 1/2" ASTM A307 Square Head Screws
Square Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- High tensile strength of 60,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure.
- Partially threaded design provides superior holding power and resistance to loosening under vibration, ideal for structural connections.
- ASTM Grade A steel construction offers dependable durability and consistent mechanical properties for long-term industrial use.
- Coarse UNC thread enables faster installation and easier alignment, saving valuable assembly time.
- External square drive head allows for high-torque application with standard tools, preventing cam-out and ensuring secure fastening.
- RoHS 3 compliance guarantees environmental safety and meets international regulatory standards for hazardous substances.
- Unified Standard Class 2A thread fit ensures compatibility with standard nuts and tapped holes, facilitating seamless integration.
Professional Applications & Engineering Value
This 5/8"-11 UNC square head screw is engineered from ASTM Grade A steel to address critical industrial fastening challenges. Its partially threaded configuration concentrates grip strength where needed, preventing joint slippage in heavy machinery, construction frameworks, and structural steel assemblies. The coarse thread design resists clogging in dirty or painted environments, while the external square drive head withstands high torque without stripping, reducing tool wear and maintenance downtime. With a Rockwell B69 hardness and compliance with ASTM A307, this fastener delivers consistent performance in applications requiring low strength but high reliability, such as anchor bolts, pipe flanges, and equipment bases, ensuring long-term operational integrity.
Specification Summary & Compliance
This square head screw features a Unified Standard Class 2A thread fit for precise dimensional accuracy, with a thread size of 5/8"-11 UNC and a minimum thread length of 1 1/2". Manufactured to ASTM A307 specifications, it ensures consistent quality and mechanical properties. The product is fully RoHS 3 (2015/863/EU) Compliant, adhering to environmental regulations for hazardous substance restrictions.
