S-91205A605 5/16"-24 x 2" ASME B18.3, ASTM A574 Alloy Steel Thread-Locking Socket Head Screws

Key Features & Benefits at a Glance

• Secure vibration resistance with nylon patch thread locker that maintains locking performance from -70° to 250°F
• Exceptional tensile strength rated at 170,000 psi for heavy-duty applications and structural integrity
• Precise Class 3A thread fit ensures reliable engagement and reduces cross-threading risks in assembly
• Corrosion-resistant black-oxide finish on alloy steel enhances durability in harsh industrial environments
• Standard hex socket drive allows for high-torque installation with common tools and confined space access
• Fine UNF thread spacing provides superior clamping force distribution and vibration resistance
• Partial threading design offers optimized grip length for specific material thickness requirements

Professional Applications & Engineering Value

Engineered for demanding industrial fastening applications, these socket head cap screws combine black-oxide alloy steel construction with advanced nylon patch locking technology to solve critical vibration-induced loosening problems in machinery, automotive, and aerospace assemblies. The fine UNF thread configuration delivers superior fatigue resistance under dynamic loads, while the Rockwell C37 hardness ensures lasting performance in high-stress environments. The partially threaded design allows engineers to precisely control clamping force distribution, making these fasteners ideal for precision equipment where vibration resistance and reliability are paramount.

Specification Summary & Compliance

Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and ASTM A574 material standards. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features 5/16"-24 UNF fine threads with 1/4" hex drive and 2" length with partial threading.