S-91255A811 8-32 x 2 1/2" ASTM F835 Steel Button Head Hex-Drive Screws

Key Features & Benefits at a Glance

• Exceptional corrosion resistance with black-oxide coating, ideal for harsh industrial environments
• Superior tensile strength (120,000 psi) ensures reliable performance in high-stress applications
• Precise Class 3A thread fit provides secure, vibration-resistant fastening with minimal play
• Hex drive design enables high-torque installation and removal without stripping
• Partially threaded shank allows for controlled clamping force and material clearance
• Hardened alloy steel construction (Rockwell C39) delivers long-term durability and wear resistance
• Comprehensive regulatory compliance meets ASME, ASTM, RoHS 3, and REACH standards for global acceptance

Professional Applications & Engineering Value

Engineered for demanding industrial applications, this black-oxide alloy steel screw combines high tensile strength with superior corrosion protection to withstand aggressive environments. The 8-32 UNC coarse thread design ensures rapid installation and reliable holding power in soft materials or where vibration resistance is critical. Featuring a rounded head with hex drive, it provides flush mounting while enabling high-torque application without cam-out. The partially threaded configuration allows precise clamp load control, making it ideal for machinery assembly, equipment manufacturing, and structural fastening where precision and durability are paramount.

Specification Summary & Compliance

Manufactured to Class 3A thread fit tolerances with UNC coarse thread spacing and right-hand threading. Complies with ASME B18.3 dimensional standards and ASTM F835 mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements for hazardous substance restrictions.