S-91259A544 10-24 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional strength and durability with alloy steel construction, providing 140,000 psi tensile strength and 84,000 psi minimum shear strength for reliable performance in demanding applications.
• Precise alignment and reduced wear thanks to the 1/4" shoulder diameter with tight tolerances, ensuring accurate component positioning and extended service life.
• Corrosion-resistant black oxide finish enhances longevity by protecting against rust and wear in harsh industrial environments.
• Secure and efficient installation with a hex socket drive and knurled head, offering superior grip and torque transmission without slippage.
• High-precision Class 3A thread fit with 10-24 UNC coarse threads, ensuring consistent, vibration-resistant fastening in right-hand applications.
• Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, guaranteeing quality, safety, and environmental responsibility.
• Optimized for heavy-duty use with Rockwell C32 hardness, maintaining structural integrity under high stress and repetitive loads.

Professional Applications & Engineering Value

This 10-24 UNC shoulder screw is engineered to address critical alignment and strength challenges in precision assemblies. The alloy steel core, combined with a black oxide finish, resists corrosion and wear, making it ideal for machinery, automotive, and aerospace components where exposure to oils and moisture is common. The 1/4" shoulder diameter with minimal tolerances ensures exact part positioning, reducing misalignment and bearing surface wear. With a socket head and hex drive, it allows for high-torque installation in confined spaces, while the Class 3A thread fit and coarse UNC threads provide reliable, vibration-resistant fastening. This screw is perfect for applications requiring repeated disassembly, such as in jigs, fixtures, and rotating assemblies, delivering long-term reliability and reduced maintenance costs.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for high accuracy and UNC coarse threads (10-24 size) with a thread diameter of 0.19". The shoulder features a diameter of 1/4" with a tolerance of -0.004" to -0.002" and a length of 1 1/4" with a tolerance of -0.005" to 0.005". It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and industry reliability.