S-91870A203 8-32 x 1 1/4" ASME B18.3 Tamper-Resistant Torx Stainless Steel Flat Head Screws
Tamper-Resistant Torx Stainless Steel Flat 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 Torx T20 drive for secure installations in public or restricted-access environments
- Superior corrosion resistance from 18-8 stainless steel and passivated finish, ideal for harsh industrial conditions
- High-strength performance with 70,000 psi tensile strength and Rockwell B70 hardness for demanding applications
- Precise thread engagement with Class 3A UNC coarse threads ensuring reliable fastening and vibration resistance
- Streamlined installation featuring a standard flat head with 82° countersink angle for flush mounting
- Full-thread design providing maximum grip length and uniform load distribution along the entire fastener
- Regulatory compliance meeting ASME B18.3 standards and environmental regulations for global industrial use
Professional Applications & Engineering Value
These 8-32 UNC flat head screws with tamper-resistant Torx T20 drive are engineered to address critical security and durability challenges in industrial settings. The 18-8 stainless steel construction combined with passivated finish provides exceptional resistance to corrosion, oxidation, and chemical exposure, making them ideal for outdoor equipment, marine applications, and food processing machinery. The Class 3A thread fit ensures precise mating with tapped holes, reducing the risk of cross-threading and maintaining clamping force under vibration. With their 82° countersink angle and flat head profile, they create seamless surfaces in assemblies while the tamper-resistant drive deters unauthorized access in public infrastructure, security panels, and electronic enclosures.
Specification Summary & Compliance
Manufactured to exacting standards with Class 3A thread fit and UNC coarse threading for optimal engagement. These fully threaded screws maintain dimensional accuracy per ASME B18.3 specifications with consistent 82° countersink geometry. Compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring suitability for global industrial supply chains.
