S-92949A885 1/2"-20 x 2 1/2" ASME B18.3, ASTM F879 Stainless Steel Button Head Hex-Drive Screws
Stainless 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
- Superior corrosion resistance with 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Precise Class 3A thread fit ensures reliable engagement and vibration resistance in critical assemblies
- High tensile strength of 70,000 psi provides exceptional load-bearing capacity for demanding applications
- Rockwell B55 hardness maintains thread integrity and prevents stripping under repeated use
- Full threading along 2½" length offers maximum grip and adjustment flexibility
- 5/16" hex drive design enables secure tool engagement and efficient installation
- Rounded button head profile combines aesthetic appeal with reduced snagging risks
Professional Applications & Engineering Value
These 1/2"-20 UNF Class 3A rounded head screws deliver exceptional performance in precision engineering applications where corrosion resistance and thread reliability are paramount. The 18-8 stainless steel composition, enhanced by passivated surface treatment, provides lasting protection against chemical exposure and atmospheric corrosion in marine, food processing, and chemical plant environments. The fine UNF thread spacing and Class 3A fit ensure minimal backlash and superior vibration resistance in machinery, automotive assemblies, and structural frameworks. With full threading along the entire 2½" length, these hex drive screws accommodate varying material thicknesses while maintaining consistent clamping force. The combination of 70,000 psi tensile strength and Rockwell B55 hardness makes these industrial fasteners suitable for high-stress applications where fastener failure is not an option.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread tolerance for precision fit. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Features UNF fine thread specification (1/2"-20) with right-hand threading and fully threaded design. Mechanical properties include Rockwell B55 hardness and 70,000 psi tensile strength.
