S-92949A863 5/16"-24 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 thanks to 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments
- Exceptional tensile strength of 70,000 psi ensures reliable performance under high-stress applications
- Precise Class 3A thread fit provides secure, vibration-resistant connections with minimal risk of loosening
- Hex drive design allows for high-torque installation and easy maintenance with standard tools
- Fine UNF threading delivers superior holding power and improved load distribution compared to coarse threads
- Full compliance with ASME B18.3 guarantees dimensional accuracy and interchangeability with other standard components
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global regulatory acceptance
Professional Applications & Engineering Value
This 18-8 stainless steel rounded head screw addresses critical engineering challenges in demanding environments where corrosion resistance and mechanical strength are paramount. The combination of UNF fine threading and Class 3A thread fit ensures superior vibration resistance in machinery, automotive assemblies, and structural applications where loosening could cause catastrophic failure. The passivated finish significantly enhances the natural corrosion resistance of stainless steel, making these hex drive screws ideal for chemical processing equipment, marine applications, and food processing machinery where exposure to moisture and aggressive substances is common. With 70,000 psi tensile strength and Rockwell B55 hardness, these industrial fasteners maintain integrity under sustained loads while the rounded button head profile provides a finished appearance and eliminates sharp edges in accessible areas.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit precision and UNF fine thread profile (5/16"-24). Features include 2-1/2" length, 0.547" head diameter, and fully threaded design. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Meets ASTM F879 standards for quality assurance.
