S-90484A164 4-40 x 3/4" ASME B18.3, ASTM F835 Tamper-Resistant Hex-Drive Steel Button Head Screws
Tamper-Resistant Hex-Drive Steel Button Head Screws
Image may differ from product. See technical specification for details.
Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
- Fast delivery
- Enjoy discounts on bulk purchases
- Secure Payment
- Fast Global Shipping
Key Features & Benefits at a Glance
- Superior tamper resistance with specialized hex drive design to prevent unauthorized access in sensitive installations
- Exceptional durability through Black-Oxide surface treatment providing corrosion resistance and extended service life
- Precision thread engagement with Class 3A fit ensuring reliable fastening in high-vibration environments
- High-load capacity supported by 130,000 psi tensile strength for demanding industrial applications
- Optimized hardness at Rockwell C39 maintaining structural integrity under repeated stress
- Enhanced installation efficiency with coarse thread spacing enabling quicker assembly in production lines
- Comprehensive compliance meeting major industrial standards for global project specifications
Professional Applications & Engineering Value
These 4-40 UNC thread screws with Black-Oxide Alloy Steel construction address critical challenges in industrial assembly where corrosion resistance and tamper-proof security are paramount. The rounded button head style provides a low-profile finish while the tamper-resistant hex drive prevents unauthorized disassembly in public-facing equipment, access panels, and regulatory-controlled environments. Engineered with coarse thread spacing and Class 3A thread fit, these fasteners deliver superior vibration resistance in machinery, electronic enclosures, and automotive components where loosening under dynamic loads would compromise system integrity. The combination of 130,000 psi tensile strength and Rockwell C39 hardness ensures reliable performance in high-stress applications without thread stripping or head deformation.
Specification Summary & Compliance
Manufactured to precise Class 3A thread fit tolerances with 4-40 UNC coarse thread specifications and fully threaded design. Complies with ASME B18.3 dimensional standards and ASTM F835 material specifications. Meets environmental regulations including RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for restricted substance control.
