S-91251A587 5/16"-18 x 1 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 corrosion resistance with black-oxide coating for extended service life in harsh industrial environments
- Exceptional load-bearing capability with 170,000 psi tensile strength to withstand extreme mechanical stress
- Precise thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance
- Optimized torque transmission through hex socket drive design for secure installation and removal
- Enhanced durability with Rockwell C37 hardness maintaining structural integrity under repeated use
- Broad compatibility with UNC coarse threads for quick assembly in various industrial applications
- Full regulatory compliance meeting ASTM A574, RoHS 3, and REACH standards for global industrial use
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver critical performance advantages in demanding engineering applications. The Class 3A thread fit provides superior clamping force and vibration resistance in machinery assembly, while the UNC coarse thread design enables rapid installation in production environments. The hex socket drive allows for high-torque application in confined spaces, making these fasteners ideal for automotive, aerospace, and heavy equipment manufacturing. With 170,000 psi tensile strength and Rockwell C37 hardness, these screws maintain integrity under extreme mechanical loads, preventing failure in critical joints. The black-oxide surface treatment offers enhanced corrosion protection, extending service life in challenging operating conditions while maintaining dimensional stability.
Specification Summary & Compliance
Manufactured to ASTM A574 specifications with Class 3A thread fit precision and UNC coarse thread profile (5/16"-18). Features include right-hand threading, standard socket head profile, and full threading along the 1-1/2" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for industrial applications worldwide.
