S-91259A174 10-32 ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Enhanced Durability – Alloy steel construction with Rockwell C32 hardness provides superior resistance to wear and deformation in demanding applications.
• Precise Alignment & Reduced Wear – The 1" shoulder length with tight tolerances ensures accurate component positioning and minimizes bushing or bearing wear.
• High Load Capacity – With 140,000 psi tensile strength and 84,000 psi minimum shear strength, it reliably handles heavy mechanical stresses.
• Corrosion Resistance – Black oxide finish offers protection against rust, extending service life in various industrial environments.
• Secure Fastening – Class 3A thread fit and 10-32 UNF fine thread design deliver vibration resistance and reliable clamping force.
• Easy Installation & Removal – Hex socket drive and knurled head allow for quick, slip-resistant tool engagement in confined spaces.
• Regulatory Compliance – Meets ASTM A574, RoHS 3, and REACH standards, ensuring safety and environmental responsibility.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical alignment and load-bearing challenges in precision assemblies. The 1" shoulder length with controlled tolerances acts as a precise pivot or axle, reducing wear on moving parts like bearings, gears, and linkages in machinery. The 10-32 UNF fine thread and Class 3A fit ensure tight, vibration-resistant connections, crucial for automotive, aerospace, and industrial equipment. The black oxide finish enhances corrosion resistance, making it suitable for environments exposed to moisture or chemicals. Its high tensile and shear strength provides reliability in dynamic applications, preventing joint failure and minimizing maintenance downtime.

Specification Summary & Compliance

This shoulder screw features a 10-32 UNF fine thread with Class 3A fit for precision threading. The shoulder diameter is 1/4" with a tolerance of -0.004" to -0.002", and the shoulder length is 1" with a tolerance of -0.005" to 0.005", ensuring exact dimensional accuracy. It complies with ASTM A574 specifications for high-strength socket head cap screws, and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, meeting environmental and safety standards for industrial use.