S-91255A190 8-32 x 1/4" ASTM F835 Steel Button Head Hex-Drive Screws
Steel Button Head Hex-Drive Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior corrosion resistance with black-oxide coating, extending service life in harsh industrial environments
- Exceptional tensile strength (120,000 psi) ensures reliable performance under high-stress applications
- Precision Class 3A thread fit provides secure, vibration-resistant fastening with minimal play
- Hex drive design enables high-torque installation without cam-out risks
- Rockwell C39 hardness maintains structural integrity through repeated assembly cycles
- Full threading allows maximum engagement depth across the entire fastener length
- Regulatory compliance meets ASME B18.3, ASTM F835, RoHS 3 and REACH standards for global acceptance
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 8-32 UNC thread screws with coarse thread spacing deliver exceptional performance in machinery, automotive, and electronic assemblies. The black-oxide alloy steel construction provides superior corrosion resistance compared to standard finishes, while the rounded button head profile creates a low-profile fastener that minimizes snagging hazards. The hex drive design ensures positive engagement during high-torque installations, preventing tool slippage that can damage fastener heads. With fully threaded construction and Class 3A fit, these screws maintain consistent clamping force in vibration-prone environments, making them ideal for critical assemblies where fastener failure is not an option.
Specification Summary & Compliance
These rounded head screws feature precision 8-32 UNC threads with Class 3A fit per ASME standards, ensuring tight tolerances for reliable performance. Manufacturing complies with ASME B18.3 dimensional specifications and ASTM F835 mechanical requirements. Environmental compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming the absence of restricted substances. The combination of 120,000 psi tensile strength and Rockwell C39 hardness guarantees durability across industrial applications.
