S-91255A073 2-56 x 3/32" ASTM F835 Steel Button Head Hex-Drive Screws
Steel Button Head Hex-Drive Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Exceptional tensile strength of 120,000 psi ensures reliable performance in demanding applications, reducing the risk of fastener failure
- Black-oxide coating on alloy steel provides superior corrosion resistance and enhanced durability in harsh industrial environments
- Class 3A thread fit delivers precise, secure fastening with minimal play, improving assembly accuracy and vibration resistance
- Hex drive design (0.050") allows for high-torque installation with standard tools, speeding up assembly and reducing labor time
- Full threading with UNC coarse spacing ensures maximum grip and load distribution across the entire fastener length
- Rockwell C39 hardness maintains thread integrity and prevents stripping during repeated installations
- Compliance with ASME B18.3 and ASTM F835 guarantees consistent quality and interchangeability in regulated industries
Professional Applications & Engineering Value
These 2-56 UNC thread screws with rounded button head design are engineered for precision assemblies where space constraints and reliability are critical. The black-oxide alloy steel construction provides excellent resistance to oxidation and wear, making them ideal for electronics enclosures, machinery panels, and automotive components exposed to moderate environmental stress. The hex drive configuration enables secure installation in confined areas without cam-out issues, while the Class 3A thread fit ensures consistent clamping force in vibration-prone applications. Fully threaded with coarse UNC spacing, these screws offer superior holding power in both metallic and composite materials, reducing the need for frequent maintenance and replacements in industrial settings.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread tolerance for superior fit and consistent performance. Complies with ASME B18.3 dimensional specifications and ASTM F835 mechanical properties. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring safe use in regulated markets. Right-hand UNC coarse threads provide reliable engagement in standard tapped holes.
