S-94063A066 4-40 x 3/8" ASME B18.6.3 Tamper-Resistant Drilled Spanner Flat Head Screws
Tamper-Resistant Drilled Spanner 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
- Superior corrosion resistance with 18-8 stainless steel construction and passivated finish for extended service life in harsh environments
- High-strength performance delivering 70,000 PSI tensile strength and Rockwell B70 hardness for reliable load-bearing applications
- Precision Class 2A thread fit with UNC coarse spacing ensuring smooth installation and vibration resistance
- Secure spanner drive engagement via drilled head design preventing cam-out during high-torque assembly
- Flush mounting capability with standard 82° countersink angle for streamlined surfaces in precision assemblies
- Full regulatory compliance meeting ASME B18.6.3 dimensional standards and RoHS 3/REACH environmental directives
- Complete threading across the 3/8" length for maximum grip range and uniform stress distribution
Professional Applications & Engineering Value
Engineered for demanding industrial applications, these 4-40 UNC flat head screws solve critical fastening challenges where corrosion resistance and high tensile strength are paramount. The 18-8 stainless steel material combined with passivated surface treatment creates a protective oxide layer that withstands chemical exposure and moisture, making these drilled spanner drive screws ideal for electrical enclosures, precision instrumentation, and marine components. The Class 2A thread fit with coarse thread spacing ensures rapid installation while maintaining positional stability in vibrating environments, reducing maintenance cycles and assembly time for high-volume production lines.
Specification Summary & Compliance
Manufactured to ASME B18.6.3 dimensional specifications with Class 2A thread tolerances for consistent mating with standard nuts and threaded holes. The UNC 4-40 thread form with coarse spacing provides optimal engagement in various materials. Full compliance with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations ensures environmental safety and global market acceptance. Mechanical properties include 70,000 PSI tensile strength and Rockwell B70 hardness with standard 82° countersink angle for flush mounting applications.
