S-90044A251 3-56 x 1" 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.
• Superior corrosion resistance provided by the black-oxide finish on alloy steel, extending service life in demanding industrial environments.
• Precise Class 3A thread fit guarantees tight, secure fastening with minimal play, ideal for precision assemblies.
• Fine UNF threads offer improved vibration resistance and better load distribution compared to coarse threads.
• Hex socket drive design allows for high torque application and easy installation in confined spaces.
• Rockwell C37 hardness provides excellent wear resistance, maintaining thread integrity through repeated use.
• Compliance with ASTM A574 ensures consistent quality and mechanical properties for critical applications.

Professional Applications & Engineering Value

These 3-56 UNF socket head cap screws are engineered for precision machinery, automotive components, and aerospace assemblies where space constraints and vibration resistance are critical. The black-oxide alloy steel construction combined with fine threads prevents loosening under dynamic loads, while the partially threaded design concentrates clamping force exactly where needed. The hex drive enables secure installation in deep counterbores, making them ideal for jigs, fixtures, and high-performance equipment requiring Class 3A thread fit accuracy and repeatable fastening solutions in inch-system applications.

Specification Summary & Compliance

Manufactured to ASTM A574 specifications with Class 3A thread fit tolerance for superior precision. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features UNF fine threads in right-hand direction, 5/64" hex drive, and 1" length with partial threading. System of measurement: Inch.