S-90275A108 4-40 x 3/8" ASME B18.6.3 Steel Slotted Flat Head Screws
Steel Slotted 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 zinc-plated steel construction for extended service life in demanding environments
- Optimal flush mounting with standard 82° countersink angle and flat head design for seamless surface integration
- Enhanced driving precision through slotted drive style enabling secure tool engagement and controlled installation
- Reliable thread engagement with Class 2A UNC coarse threads ensuring consistent fastening performance
- Exceptional mechanical strength from Rockwell B70 hardness providing resistance to deformation under load
- Full-thread coverage across the 3/8" length for maximum grip and load distribution
- Regulatory compliance assurance meeting ASME B18.6.3 specifications and international environmental standards
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where surface-flush fastening and corrosion resistance are paramount. The zinc-plated steel construction provides essential protection against environmental degradation, while the coarse UNC threading ensures rapid installation and secure holding power in various substrates. The 82° countersink angle enables perfect seating in machined applications, eliminating protrusion issues in precision assemblies. Particularly valuable in industrial equipment, electronic enclosures, and machinery where right-hand threaded fasteners require both durability and regulatory compliance. The combination of Rockwell B70 hardness and fully threaded design addresses common failure points in vibration-prone applications.
Specification Summary & Compliance
Manufactured to exact inch system dimensions with Class 2A thread fit tolerance for consistent mating with corresponding nuts and threaded holes. Complies with ASME B18.6.3 mechanical standards for dimensional accuracy and performance. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for restricted substance compliance. Features UNC coarse thread profile with right-hand direction and fully threaded 3/8" length for maximum fastening versatility.
