S-92949A113 4-40 x 3/4" ASME B18.3 Stainless Steel Button Head Hex-Drive Screws
Stainless Steel Button Head Hex-Drive 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 thanks to 18-8 stainless steel construction and passivated finish, ensuring long-term reliability in harsh environments.
- Exceptional tensile strength rated at 70,000 psi provides reliable, high-load fastening for demanding industrial applications.
- Precise Class 3A thread fit ensures smooth installation, secure engagement, and reduced risk of cross-threading.
- Hex drive design (1/16") offers excellent torque transmission and slip resistance during installation and removal.
- Rounded button head profile delivers a low-profile, finished appearance while minimizing snagging risks.
- Full threading along the 3/4" length allows for maximum grip and adjustability in various material thicknesses.
- Compliance with major standards including ASME B18.3, RoHS, and REACH guarantees quality and environmental safety.
Professional Applications & Engineering Value
These 4-40 UNC thread rounded head screws are engineered to address critical challenges in precision assembly and corrosive environments. The 18-8 stainless steel material, combined with a passivated finish, provides outstanding resistance to oxidation and chemical exposure, making them ideal for electronics enclosures, medical devices, and marine equipment. The coarse thread spacing and Class 3A thread fit ensure rapid installation with minimal thread wear, while the hex drive prevents tool slippage under high torque. With a 70,000 psi tensile strength and Rockwell B55 hardness, these fully threaded screws maintain integrity under vibration and dynamic loads, offering a dependable solution for OEMs and maintenance teams requiring durable, corrosion-resistant fasteners.
Specification Summary & Compliance
This product adheres to Class 3A thread fit tolerances per the UNC thread standard, ensuring precision and interchangeability. Manufacturing and dimensional specifications comply with ASME B18.3. The screws are fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, confirming they are free of restricted hazardous substances and meet stringent environmental and safety regulations for global industrial use.
