S-90484A555 5/16"-18 x 3/4" ASME B18.3, ASTM F835 Tamper-Resistant Hex-Drive Steel Button Head Screws
Tamper-Resistant Hex-Drive Steel Button Head 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 tamper resistance with specialized hex drive design for enhanced security in public or restricted-access applications
- Exceptional load-bearing capacity with 130,000 psi tensile strength to withstand heavy mechanical stress and vibration
- Precision thread engagement through Class 3A fit and UNC coarse threading for faster installation and reduced cross-threading risk
- Enhanced corrosion protection from Black-Oxide coating on alloy steel, extending service life in demanding environments
- Optimized head profile with rounded button design providing low-clearance seating without sharp edges
- Full-thread engagement along the entire 3/4" length for maximum grip strength in various material thicknesses
- Industry compliance assurance meeting ASME B18.3 specifications for consistent quality and dimensional accuracy
Professional Applications & Engineering Value
These Black-Oxide Alloy Steel Rounded Head Screws deliver critical performance advantages in industrial assembly where security, strength, and corrosion resistance are paramount. The tamper-resistant hex drive prevents unauthorized access in public infrastructure, electrical enclosures, and machinery guards, while the Class 3A UNC coarse threads provide rapid installation in production environments. With 130,000 psi tensile strength and Rockwell C39 hardness, these fully threaded fasteners maintain integrity under dynamic loads and vibration in automotive, construction, and heavy equipment applications. The rounded button head profile offers a finished appearance while minimizing snag hazards in consumer-facing products.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision engagement. Features 5/16"-18 UNC coarse threads with full threading along the 3/4" length. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations. Material certification includes Black-Oxide Alloy Steel with Rockwell C39 hardness and 130,000 psi tensile strength.
