S-91900A607 5/16"-18 x 1/2" ASME B18.3 Tamper-Resistant Torx Stainless Steel Button Head Screws
Tamper-Resistant Torx Stainless 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
- Enhanced tamper resistance with T40 Torx drive prevents unauthorized access in security-critical applications
- Superior corrosion resistance through 18-8 stainless steel construction and passivated finish for extended service life
- Reliable thread engagement with Class 3A thread fit ensuring precise, vibration-resistant fastening
- High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness for demanding industrial environments
- Optimized installation efficiency through fully threaded coarse UNC design for faster assembly in various materials
- Low-profile rounded head design provides smooth finished appearance while minimizing snagging hazards
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial applications
Professional Applications & Engineering Value
This 5/16"-18 UNC rounded head tamper-resistant Torx screw delivers critical security and durability where standard fasteners fail. The 18-8 stainless steel construction with passivated finish provides exceptional corrosion resistance in harsh environments, while the T40 tamper-resistant drive system deters unauthorized access in public infrastructure, electrical enclosures, and machinery guarding. The Class 3A thread fit ensures precise engagement that resists vibration loosening, making it ideal for assembly lines, industrial equipment, and security installations where reliability is paramount. The combination of 70,000 psi tensile strength and fully threaded coarse pitch design enables rapid installation while maintaining structural integrity under stress.
Specification Summary & Compliance
This security fastener features precision Class 3A thread fit with 5/16"-18 UNC coarse threads and right-hand threading. Manufactured to ASME B18.3 specifications with dimensional accuracy including 0.547" head diameter and 1/2" length. The screw meets RoHS 3 (2015/863/EU) compliance for hazardous substance restrictions and REACH (EC 1907/2006) standards for chemical safety, ensuring suitability for global industrial markets and regulated applications.
