S-91465A122 5/16"-18 x 1 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 provides reliable holding power for structural and industrial applications.
- ASTM Grade A steel construction offers excellent durability and resistance to wear in demanding environments.
- External square drive head allows for secure tool engagement and easy installation with common wrenches.
- Coarse UNC threading ensures quick assembly and reduced cross-threading risk in various materials.
- Partially threaded design enables precise clamping force control and secure fastening in specific joint types.
- RoHS 3 compliance guarantees environmental safety and meets international regulatory standards for hazardous substances.
- Unified Standard Class 2A thread fit ensures consistent performance and interchangeability with standard nuts.
Professional Applications & Engineering Value
This 5/16"-18 UNC square head screw is engineered to address common industrial challenges, such as vibration loosening and corrosion in machinery assemblies. Made from ASTM Grade A steel with a Rockwell B69 hardness, it withstands moderate stress and wear, making it ideal for construction, agricultural equipment, and general fabrication. The coarse thread and partially threaded shank provide enhanced grip in wood, metal, and composite materials, reducing installation time and improving joint integrity. Its external square drive head offers superior torque transmission, minimizing slippage during tightening in confined spaces. By meeting ASTM A307 specifications, this fastener delivers consistent quality for B2B procurement in maintenance, repair, and OEM operations.
Specification Summary & Compliance
This screw adheres to precise dimensional standards, including a Unified Standard Class 2A thread fit for consistent tolerance and a 1-1/2" length with a minimum thread length of 7/8". It complies with ASTM A307 for low-strength applications and is RoHS 3 (2015/863/EU) compliant, ensuring no restricted hazardous materials. Manufactured in the inch system, it features right-hand thread direction and coarse UNC threading for reliable performance in industrial settings.
