S-90128A578 5/16"-18 x 1/2" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
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.
- Superior corrosion resistance from zinc plating protects against rust and extends service life in harsh industrial environments.
- Precise Class 3A thread fit guarantees tight, secure connections with minimal play, ideal for precision assemblies.
- High hardness (Rockwell C37) provides excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threading allows for quick installation and removal, saving time in maintenance and assembly operations.
- 1/4" hex drive design offers easy torque application with standard tools, enhancing installation efficiency.
- Full threading along the 1/2" length ensures consistent grip and load distribution across the entire fastener.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these socket head cap screws deliver robust performance where reliability is critical. The zinc-plated alloy steel construction combats corrosion in moisture-prone environments, while the Class 3A thread fit and coarse UNC threads provide secure, vibration-resistant fastening in machinery, automotive, and heavy equipment assemblies. With a 170,000 PSI tensile strength and Rockwell C37 hardness, they withstand extreme loads and repetitive stress, reducing maintenance downtime. The 1/4" hex drive facilitates easy installation in confined spaces, making them a top choice for engineers seeking durability and precision in high-strength fasteners.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC thread with Class 3A fit for precise dimensional accuracy and coarse spacing. It complies with ASTM A574 specifications for high-strength socket head cap screws, ensuring consistent manufacturing quality. Additionally, it meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, supporting safe and sustainable industrial use.
