S-91259A634 5/16"-18 ASME B18.3, ASTM A574 Shoulder Screws
Shoulder 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
- High tensile strength of 140,000 psi ensures reliable performance in demanding mechanical assemblies, reducing the risk of fastener failure.
- Precision Class 3A thread fit provides superior engagement and vibration resistance, minimizing loosening in high-stress applications.
- Black oxide finish on alloy steel offers enhanced corrosion resistance, extending service life in harsh industrial environments.
- Knurled socket head with hex drive allows for secure tool grip and easy installation, even in confined spaces.
- 2-1/2" shoulder length with tight tolerances ensures accurate alignment and smooth rotation for pivoting components.
- Coarse UNC threads enable quick assembly and disassembly, improving maintenance efficiency.
- Compliance with ASME B18.3, RoHS 3, and REACH guarantees adherence to industry standards and environmental regulations for safe use.
Professional Applications & Engineering Value
This alloy steel shoulder screw is engineered to address common industrial challenges such as misalignment, wear, and corrosion in machinery. The 5/16"-18 UNC thread with coarse spacing ensures rapid installation in equipment requiring frequent adjustments, while the black oxide finish provides a durable barrier against rust and chemical exposure. Ideal for use in precision assemblies like pivots, gears, and linkages, the 2-1/2" shoulder length maintains exact positioning, reducing friction and extending component life. Its high tensile and shear strength makes it suitable for heavy-duty applications in automotive, aerospace, and manufacturing sectors, where reliability under load is critical.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit for precise engagement, with shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005" to ensure dimensional accuracy. It conforms to ASME B18.3 manufacturing specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) standards, ensuring environmental safety and regulatory adherence.
