S-91864A018 4-40 x 1/8" ASTM A574 Alloy Steel Socket Head Screws
Alloy Steel Socket 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 strength-to-weight ratio with 170,000 psi tensile strength for reliable performance in high-stress applications
- Superior corrosion resistance through black-oxide coating on alloy steel, extending service life in demanding environments
- Precision thread engagement with Class 3A fit ensuring secure fastening and vibration resistance
- Optimized drive efficiency featuring hex socket design for maximum torque transmission and strip-resistant installation
- Full thread coverage along the entire 1/8" length for consistent clamping force distribution
- Enhanced durability with Rockwell C37 hardness maintaining dimensional stability under repeated use
- Industry compliance assurance meeting ASTM A574 specifications for guaranteed mechanical properties
Professional Applications & Engineering Value
Engineered for precision assembly applications, these 4-40 UNC socket head cap screws deliver critical performance advantages in industrial machinery, aerospace components, and electronic enclosures. The black-oxide alloy steel construction provides superior corrosion protection while maintaining the high tensile strength required for vibration-prone environments. The Class 3A thread fit ensures precise engagement with mating components, eliminating play and maintaining alignment in precision instruments. The hex drive system allows for high-torque installation in confined spaces, while the coarse thread pattern facilitates rapid assembly without compromising holding power. These fasteners solve common engineering challenges including galling prevention, consistent clamp load maintenance, and resistance to loosening under dynamic loads.
Specification Summary & Compliance
This socket head cap screw features precision 4-40 UNC coarse threads with Class 3A fit for exacting tolerance requirements. Manufactured to ASTM A574 specifications governing chemical composition and mechanical properties. Fully compliant with RoHS 3 (2015/863/EU) environmental directives and REACH (EC 1907/2006) regulations regarding substance restrictions. The fully threaded design maintains consistent thread form along the entire 1/8" length, ensuring reliable performance in critical fastening applications.
