S-91259A500 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional load-bearing capacity with 140,000 psi tensile strength and 84,000 psi shear strength for reliable performance in demanding applications.
• Superior corrosion resistance thanks to the black oxide finish, extending service life in harsh industrial environments.
• Precise alignment and reduced wear due to the knurled head and standard shoulder fit, ensuring stable component positioning.
• High thread reliability with Class 3A fit and coarse UNC threads, providing secure fastening and vibration resistance.
• Easy installation and removal using a standard 1/8" hex drive, compatible with common tools for efficient maintenance.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
• Durable alloy steel construction with Rockwell C32 hardness, offering long-term durability under mechanical stress.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment and component wear. The black oxide finish enhances corrosion resistance, making it ideal for environments exposed to moisture or chemicals. With a 10-24 UNC coarse thread and Class 3A fit, it ensures tight, vibration-resistant connections in assemblies like rotating shafts and pivoting mechanisms. The 2 3/4" shoulder length with tight tolerances provides accurate spacing and reduces friction, while the socket head design allows for easy access in confined spaces. Commonly used in automotive, aerospace, and industrial equipment, this screw delivers reliable performance where high tensile strength and dimensional precision are essential.

Specification Summary & Compliance

This shoulder screw features precise dimensions, including a shoulder diameter of 1/4" with tolerance of -0.004" to -0.002" and shoulder length of 2 3/4" with tolerance of -0.005" to 0.005". Thread specifications include 10-24 UNC coarse threads with Class 3A fit for high accuracy. It meets ASME B18.3 standards and is manufactured in accordance with ASTM A574. Compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material integrity.