S-97381A105 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Lightweight yet durable construction using 6061 aluminum for excellent corrosion resistance and reduced component weight without sacrificing performance
• Precision Class 3A thread fit ensures tight tolerances and reliable fastening in demanding applications
• Knurled socket head design provides superior grip and slip resistance during installation with standard hex tools
• High strength-to-weight ratio with 40,000 psi tensile strength and 20,000 psi shear strength for robust mechanical performance
• Coarse UNC threading enables quick assembly and disassembly while resisting vibration-induced loosening
• Regulatory compliance meets RoHS 3 and REACH standards for use in regulated industrial environments
• Precision shoulder dimensions with tight tolerances ensure accurate alignment and smooth rotational movement

Professional Applications & Engineering Value

This 6061 aluminum shoulder screw delivers exceptional engineering value in applications requiring precise alignment and rotational movement. The Class 3A thread fit combined with coarse UNC threading provides reliable fastening in vibration-prone environments while maintaining easy assembly. The knurled socket head with 5/64" hex drive ensures secure tool engagement, reducing installation errors in automated or manual assembly lines. Ideal for precision machinery, robotics, and electronic enclosures, this shoulder screw offers the perfect balance of lightweight aluminum construction and mechanical strength, solving common challenges of component weight reduction without compromising structural integrity. The precisely machined shoulder provides consistent bearing surfaces for gears, pulleys, and rotating components.

Specification Summary & Compliance

This shoulder screw features precision 4-40 UNC coarse threads with Class 3A fit for superior thread engagement. The shoulder maintains tight dimensional tolerances with diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured to industry standards with right-hand thread direction and standard shoulder fit. Compliant with RoHS 3 (2015/863/EU) with exemption 6(b)-II and REACH (EC 1907/2006) regulations, ensuring environmental responsibility and regulatory acceptance for industrial applications worldwide.