S-91900A552 1/4"-20 x 3" ASME B18.3 Tamper-Resistant Torx Stainless Steel Button Head Screws

Key Features & Benefits at a Glance

• Superior tamper resistance with T27 Torx drive prevents unauthorized removal, enhancing equipment security in public or high-traffic areas.
• Exceptional corrosion resistance from 18-8 Stainless Steel and passivated finish ensures long-term reliability in harsh or outdoor environments.
• High mechanical strength with 70,000 psi tensile strength and Rockwell B70 hardness withstands heavy loads and vibration.
• Precise Class 3A thread fit and UNC coarse threads provide secure, easy installation and reliable holding power.
• Low-profile rounded button head offers a smooth finish that reduces snagging and improves aesthetic integration.
• Full threading along the 3" length allows for maximum adjustability and grip depth in various material thicknesses.
• Compliance with major industry standards including ASME B18.3, RoHS, and REACH ensures safety and environmental responsibility.

Professional Applications & Engineering Value

This 1/4"-20 x 3" rounded head tamper-resistant screw is engineered to address critical challenges in industrial and security-focused applications. The 18-8 Stainless Steel construction, combined with a passivated finish, provides robust resistance to rust and chemical exposure, making it ideal for outdoor machinery, marine equipment, and food processing facilities. The tamper-resistant Torx T27 drive deters vandalism and unauthorized access in public infrastructure, electronic enclosures, and transportation systems. Its fully threaded UNC coarse thread design ensures quick assembly and strong retention in metals and plastics, reducing the risk of loosening under dynamic loads. By meeting ASME B18.3 specifications, this screw delivers consistent performance and interchangeability, streamlining maintenance and reducing downtime in high-stakes environments.

Specification Summary & Compliance

This screw features a 1/4"-20 UNC coarse thread with Class 3A thread fit for high precision and strength. It is manufactured from 18-8 Stainless Steel with a passivated finish, and complies with ASME B18.3 dimensional standards. The product is also RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets strict environmental and safety regulations for global industrial use.