S-90044A291 4-40 x 3 1/2" 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 tensile strength of 170,000 psi ensures reliable performance under high-stress conditions, reducing the risk of fastener failure.
- Superior corrosion resistance from the black-oxide finish extends service life in harsh industrial environments, minimizing maintenance needs.
- Precise Class 3A thread fit provides secure, vibration-resistant connections for improved assembly integrity.
- Robust Rockwell C37 hardness offers excellent wear resistance, maintaining thread integrity through repeated use.
- Coarse UNC threads enable quick installation and reduced cross-threading risks, saving time in high-volume applications.
- Partially threaded design allows for controlled clamping force, ideal for components requiring precise positioning.
- Compliance with ASTM A574, RoHS 3, and REACH ensures material consistency and environmental safety for global supply chains.
Professional Applications & Engineering Value
Engineered for demanding industrial settings, these black-oxide alloy steel socket head cap screws address common challenges like vibration loosening and corrosion. The 4-40 UNC coarse thread and Class 3A fit deliver secure fastening in machinery, automotive assemblies, and precision equipment, where alignment and durability are critical. The hex drive design facilitates easy installation in confined spaces, while the high tensile strength and hardness prevent stripping under torque. Ideal for OEM and MRO applications, these screws provide long-term reliability in environments exposed to moisture, chemicals, or dynamic loads, reducing downtime and replacement costs.
Specification Summary & Compliance
This screw adheres to inch system measurements with a 3-1/2" length and Class 3A thread fit for precise dimensional accuracy. It meets ASTM A574 specifications for alloy steel socket head cap screws, ensuring consistent manufacturing quality. The product is RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, confirming adherence to environmental and safety regulations for hazardous substances.
