S-94066A110 4-40 x 1/2" ASME B18.6.3 Tamper-Resistant Drilled Spanner Stainless Steel Pan Head Screws
Tamper-Resistant Drilled Spanner Stainless Steel Pan 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
- Exceptional corrosion resistance with 18-8 stainless steel and passivated finish for long-term reliability in harsh environments
- High tensile strength of 80,000 psi ensures secure fastening under demanding mechanical loads
- Precision Class 2A thread fit guarantees consistent engagement and reduces assembly issues
- Drilled spanner drive design provides reliable tool engagement for secure installation and removal
- Fully threaded coarse UNC pattern enables faster installation and superior holding power
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH standards for industrial safety
- Optimized rounded pan head profile combines low clearance requirements with professional appearance
Professional Applications & Engineering Value
This 4-40 UNC rounded pan head screw delivers exceptional engineering value for industrial applications requiring reliable fastening in corrosive or high-stress environments. The 18-8 stainless steel construction with passivated finish provides superior protection against oxidation and chemical exposure, making it ideal for marine equipment, food processing machinery, and outdoor industrial applications. The combination of coarse UNC threading and Class 2A fit ensures rapid assembly with minimal cross-threading risk, while the drilled spanner drive maintains tool engagement integrity during high-torque applications. With full threading along the entire 1/2" length, this fastener offers maximum grip strength and vibration resistance in critical assemblies.
Specification Summary & Compliance
Manufactured to exacting ASME B18.6.3 specifications with precision Class 2A thread fit and UNC coarse thread pattern. The screw features a 4-40 thread size with 1/2" length and maintains dimensional accuracy throughout production. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across various industrial sectors. The Rockwell B96 hardness rating and 80,000 psi tensile strength guarantee mechanical reliability in demanding applications.
