S-92949A578 5/16"-18 x 1/2" ASME B18.3 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 mechanical strength with 70,000 psi tensile strength and Rockwell B55 hardness, ensuring reliable performance under heavy loads
- Precise, secure fastening achieved through Class 3A thread fit and UNC coarse threading, minimizing loosening in high-vibration applications
- Easy installation and removal with hex drive design and 3/16" drive size, allowing for efficient assembly with standard tools
- Optimized load distribution from the rounded button head profile, reducing surface damage and stress concentration
- Full thread engagement across the entire 1/2" length, providing maximum grip and pull-out resistance
- Compliance with major industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory acceptance
Professional Applications & Engineering Value
This 18-8 stainless steel rounded head screw delivers critical reliability in demanding industrial settings where corrosion and mechanical stress are constant concerns. The combination of UNC coarse threads and Class 3A fit ensures rapid assembly with minimal cross-threading risk, while the passivated finish significantly extends service life in humid or chemically aggressive environments. Its hex drive and button head design provide flush mounting with high torque capability, making it ideal for machinery, automotive assemblies, and structural frameworks requiring secure, vibration-resistant fastening. Engineered to meet ASME B18.3 specifications, it offers consistent dimensional accuracy and performance for OEMs and maintenance teams.
Specification Summary & Compliance
This screw features a 5/16"-18 UNC coarse thread with Class 3A precision tolerance for secure fit. It is manufactured from 18-8 stainless steel with a passivated surface treatment. The product fully complies with ASME B18.3 dimensional standards, RoHS 3 (2015/863/EU) for hazardous substance restrictions, and REACH (EC 1907/2006) regulations for chemical safety.
