S-91251A098 5/16"-18 x 4 1/2" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket 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
- Superior tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
- Exceptional corrosion resistance from the black-oxide finish, extending service life in harsh industrial environments.
- Precise Class 3A thread fit provides secure, vibration-resistant connections for improved assembly integrity.
- High hardness (Rockwell C37) offers excellent wear resistance, maintaining thread integrity through repeated use.
- Partially threaded design allows for controlled clamping force and easier alignment in assemblies.
- Coarse UNC threads enable quick installation and reduced cross-threading risks, saving time in production.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material quality and environmental safety for global supply chains.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these socket head cap screws combine black-oxide alloy steel with a Class 3A thread fit to address common challenges like vibration loosening and corrosion. The coarse UNC thread design facilitates rapid assembly in machinery, automotive, and heavy equipment, while the partially threaded rod ensures precise load distribution. With a 170,000 psi tensile strength and Rockwell C37 hardness, they withstand extreme forces and abrasion, reducing maintenance downtime. Ideal for inch-system applications, these screws deliver consistent performance in corrosive environments, backed by ASTM A574 standards for reliability in critical fastening tasks.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC coarse thread with Class 3A fit for tight tolerances, a 1/4" hex drive for easy installation, and a partially threaded shank with a minimum thread length of 1 1/8". It complies with ASTM A574 for material specifications, RoHS 3 (2015/863/EU) for restricted substance limits, and REACH (EC 1907/2006) for chemical safety, ensuring adherence to industrial and environmental regulations.
