S-91205A205 8-32 x 2" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Vibration-resistant locking: Integrated nylon patch thread locker prevents loosening under dynamic loads, maintaining clamp force in demanding applications from -70° to 250°F
• Exceptional strength-to-weight ratio: 170,000 psi tensile strength and Rockwell C37 hardness provide reliable performance in high-stress assemblies
• Precise thread engagement: Class 3A thread fit ensures consistent mating with female threads for improved load distribution
• Corrosion-resistant protection: Black-oxide coating on alloy steel substrate offers enhanced durability in industrial environments
• Optimized drive efficiency: Standard hex socket head with 9/64" drive size enables high torque application and space-constrained installations
• Versatile partial threading: 2" length with 1-1/8" minimum thread length allows for both clamping and positioning functions
• Industry-standard compatibility: UNC coarse thread spacing with right-hand direction ensures interchangeability with existing fastener systems

Professional Applications & Engineering Value

These black-oxide alloy steel socket head cap screws address critical vibration-induced failure points in machinery, automotive, and heavy equipment applications. The nylon patch thread locking technology provides permanent chemical fastening without requiring separate locking elements, simplifying assembly while maintaining integrity across extreme temperature cycles (-70° to 250°F). The 8-32 UNC coarse thread configuration combined with Class 3A precision threads delivers superior fatigue resistance in high-cycle applications. The partially threaded design enables precise component positioning while the hex socket drive accommodates high installation torque in confined spaces, making these fasteners ideal for critical joints in frames, brackets, and structural assemblies where reliability is paramount.

Specification Summary & Compliance

Manufactured to ASME B18.3 dimensional specifications using ASTM A574 alloy steel material. Thread system conforms to UNC coarse thread standards with Class 3A tolerance for precision fit. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features right-hand thread direction, standard socket head profile, and meets specified mechanical properties including 170,000 psi tensile strength and Rockwell C37 hardness.