S-90517A512 1/4"-20 x 5/8" ASME B18.3 Tamper-Resistant Hex Drive Flat Head Screws
Tamper-Resistant Hex Drive Flat 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
- Tamper-resistant security with specialized hex drive design to prevent unauthorized removal in sensitive applications
- Superior corrosion resistance through 18-8 stainless steel construction and passivated surface treatment
- Precision thread engagement with Class 3A fit ensuring reliable fastening and vibration resistance
- High mechanical strength with 70,000 psi tensile rating for demanding industrial applications
- Optimized flat head design providing flush mounting and clean aesthetic finish
- Regulatory compliance meeting ASME B18.3 standards for consistent quality and performance
- Environmental safety with RoHS 3 and REACH compliance for restricted substance control
Professional Applications & Engineering Value
Engineered for security-critical installations, this 18-8 stainless steel flat head screw delivers exceptional value in applications where tamper-resistant fastening is paramount. The tamper-resistant hex drive prevents unauthorized access in public facilities, electrical enclosures, and machinery guards, while the passivated finish enhances corrosion resistance in harsh environments. With Class 3A thread fit and UNC coarse threading, installation is streamlined with reduced cross-threading risk and improved vibration resistance. The 70000 psi tensile strength ensures structural integrity in high-stress applications, making these flat head screws ideal for aerospace, manufacturing, and security equipment where reliability cannot be compromised.
Specification Summary & Compliance
This fastener maintains precision Class 3A thread fit with UNC 1/4"-20 coarse threading according to ASME B18.3 specifications. Manufacturing compliance includes RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and restricted substance control. The 82° countersink angle and standard flat head profile provide optimal flush mounting capabilities, while the 5/32" tamper-resistant hex drive delivers secure installation with specialized tools.
