S-90117A205 1/4"-28 x 1" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 170,000 psi ensures reliable performance in high-stress industrial applications.
• Precise Class 3A thread fit provides superior vibration resistance and secure fastening in critical assemblies.
• Black-oxide alloy steel construction offers excellent corrosion resistance and durability in harsh environments.
• Fine thread spacing and UNF thread type deliver enhanced clamping force and improved load distribution.
• Rockwell C37 hardness rating guarantees long-term wear resistance and reduced maintenance requirements.
• 3/16" hex drive and standard socket head enable easy installation with standard tools in confined spaces.
• Full threading with wire locking capability ensures consistent grip and prevents loosening under dynamic loads.

Professional Applications & Engineering Value

This black-oxide alloy steel socket head cap screw is engineered to address critical challenges in precision machinery, automotive systems, and heavy equipment. The 1/4"-28 UNF fine thread with Class 3A fit minimizes backlash and maintains clamp load under vibration, while the 170,000 psi tensile strength handles extreme mechanical stresses. The black-oxide surface treatment provides reliable corrosion protection without compromising dimensional accuracy, making it ideal for OEM assemblies and maintenance operations where reliability and compliance with ASME B18.3 standards are paramount.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread tolerance for precision fit. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features UNF fine threads, right-hand direction, and fully threaded design with consistent Rockwell C37 hardness.