S-91259A159 6-32 ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi ensures reliable performance in high-stress industrial applications, reducing the risk of fastener failure.
• Corrosion-resistant black oxide finish provides enhanced durability and protection in harsh environments, extending the screw's service life.
• Precision UNC coarse threading with Class 3A fit offers quick, secure assembly and consistent engagement, minimizing installation errors.
• High hardness rating of Rockwell C32 maintains structural integrity under heavy loads, preventing deformation and wear over time.
• Robust alloy steel construction combined with a smooth shoulder design ensures stable alignment and reduced friction in rotating parts.
• Compliance with ASTM A574, RoHS 3, and REACH standards guarantees material quality and environmental safety for global industrial use.
• Hex socket drive design allows for easy installation and removal with standard tools, improving maintenance efficiency.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address common challenges in precision assemblies, such as misalignment and component wear. The black oxide finish not only resists corrosion but also reduces galling, making it ideal for machinery, automotive, and electronics where UNC coarse threads ensure rapid, vibration-resistant fastening. Its smooth shoulder provides a precise bearing surface, critical for pivoting mechanisms and rotating parts, while the high tensile and shear strength supports heavy-duty applications without compromising on ASTM A574 specifications. By integrating these features, it delivers reliable performance in demanding environments, from conveyor systems to robotic arms, enhancing overall assembly longevity and reducing maintenance downtime.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit for tight tolerances and consistent engagement, with UNC coarse threading (6-32 size) and a shoulder diameter tolerance of -0.004" to -0.002". It meets ASTM A574 specifications for high-strength alloy steel, ensuring dimensional accuracy and mechanical properties. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, it supports safe, environmentally responsible use in industrial settings.