S-91900A540 1/4"-20 x 3/4" ASME B18.3 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Enhanced tamper resistance with specialized T27 Torx drive prevents unauthorized removal in high-security environments
• Superior corrosion protection through 18-8 stainless steel construction and passivated finish for extended service life
• Reliable thread engagement with Class 3A thread fit and UNC coarse threading ensures secure fastening in demanding applications
• Exceptional mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness withstands heavy loads and vibration
• Optimized head design featuring rounded button profile provides smooth surface finish while maintaining drive integrity
• Full threading coverage across the 3/4" length enables maximum grip strength in various material thicknesses
• Regulatory compliance assurance meeting ASME B18.3 specifications and environmental standards including RoHS 3 and REACH

Professional Applications & Engineering Value

Engineered for critical applications where security and durability are paramount, these 18-8 stainless steel tamper-resistant Torx screws address common industrial challenges. The passivated finish significantly enhances corrosion resistance in harsh environments, while the T27 drive style prevents tampering in public facilities, machinery guards, and electronic enclosures. The Class 3A thread fit with UNC coarse threading ensures rapid installation and reliable performance in vibration-prone equipment. With 70,000 psi tensile strength, these fully threaded screws maintain structural integrity in assembly lines, automotive components, and outdoor infrastructure where rounded head screws provide both safety and aesthetic benefits.

Specification Summary & Compliance

This 1/4"-20 x 3/4" screw features precision Class 3A thread fit with UNC coarse thread specifications, manufactured to ASME B18.3 standards. The fastener maintains dimensional accuracy with 0.25" thread diameter and 3/4" length fully threaded configuration. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for industrial applications requiring strict material restrictions and safety standards.