S-90117A115 4-40 x 3/16" ASME B18.3 Alloy Steel Wire-Lockable Socket Head Screws
Alloy Steel Wire-Lockable 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
- Superior corrosion resistance with black-oxide coating, extending service life in demanding industrial environments
- Exceptional tensile strength of 170,000 psi prevents fastener failure under extreme mechanical loads
- Precision Class 3A thread fit ensures secure, vibration-resistant connections in critical assemblies
- Optimized hex drive design provides superior torque transmission and reduces tool slippage
- Rockwell C37 hardness maintains structural integrity through repeated installation cycles
- Full UNC coarse threading enables faster installation and superior performance in softer materials
- Comprehensive compliance with ASME B18.3, RoHS 3, and REACH standards for global manufacturing applications
Professional Applications & Engineering Value
These black-oxide alloy steel socket head cap screws deliver critical performance advantages in precision engineering applications where reliability is non-negotiable. The combination of 170,000 psi tensile strength and Rockwell C37 hardness provides exceptional resistance to shear forces and mechanical stress, making them ideal for high-vibration environments in machinery, automotive systems, and industrial equipment. The 4-40 UNC coarse thread configuration ensures rapid assembly while maintaining holding power in various substrate materials. With Class 3A thread fit precision, these fasteners eliminate play in critical connections, preventing loosening under dynamic loads. The black-oxide surface treatment offers superior corrosion protection without compromising dimensional tolerances, extending maintenance intervals in harsh operating conditions.
Specification Summary & Compliance
Manufactured to exacting ASME B18.3 specifications with precision Class 3A thread fit tolerances for consistent performance. Features 4-40 UNC coarse threads with right-hand orientation and standard socket head profile. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for global industrial applications. The black-oxide alloy steel construction maintains dimensional stability across temperature variations while providing reliable 170,000 psi tensile strength performance.
