S-91251A691 7/16"-14 x 6 1/2" ASTM A574 Alloy Steel Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress applications, reducing the risk of fastener failure.
• Class 3A thread fit provides superior precision and tighter tolerances for secure, vibration-resistant assemblies in demanding environments.
• Black-oxide coating on alloy steel offers enhanced corrosion resistance and a durable finish, extending service life in industrial settings.
• Partially threaded design allows for precise clamping force control, ideal for applications where specific unthreaded shaft length is required.
• 3/8" hex drive and standard socket head facilitate easy installation with common tools, improving assembly efficiency and reducing labor time.
• Coarse UNC threads enable quicker installation and better performance in materials prone to stripping or where rapid assembly is needed.
• Rockwell C37 hardness ensures high wear resistance and durability, maintaining integrity under repeated loads and harsh conditions.

Professional Applications & Engineering Value

These socket head cap screws are engineered to address critical challenges in heavy-duty industrial applications, such as machinery assembly, automotive systems, and construction equipment. The black-oxide alloy steel construction combats corrosion and wear, while the Class 3A thread fit and coarse UNC threads provide secure, vibration-resistant fastening that prevents loosening in dynamic environments. The partially threaded rod design allows for precise engagement and clamping, reducing stress concentrations and improving joint reliability. Ideal for use where high tensile strength and compliance with industry standards are paramount, these screws ensure long-term performance in demanding engineering scenarios, from manufacturing fixtures to structural supports.

Specification Summary & Compliance

This product adheres to precise dimensional standards, including Class 3A thread fit for tight tolerances and UNC coarse threads with a size of 7/16"-14. It meets ASTM A574 specifications for high-strength alloy steel fasteners and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and regulatory adherence for global industrial use.