S-91259A232 5/8"-11 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 from the black oxide finish, extending service life in harsh industrial environments.
• Precise thread engagement with Class 3A UNC coarse threads ensuring secure, vibration-resistant fastening.
• Enhanced grip and handling due to the knurled socket head, allowing for easy installation even in tight spaces with a 3/8" hex drive.
• Accurate alignment and spacing provided by the 7 1/2" shoulder with tight diameter tolerance for consistent component mounting.
• High durability and wear resistance from Rockwell C32 hardened alloy steel, reducing maintenance and replacement frequency.
• Broad compliance and reliability meeting ASME B18.3, ASTM A574, RoHS 3, and REACH standards for safe, global use.

Professional Applications & Engineering Value

This alloy steel shoulder screw is engineered to address critical challenges in precision machinery and industrial assemblies, where misalignment and component wear can lead to costly downtime. The 5/8"-11 UNC coarse thread with Class 3A fit ensures rapid, secure fastening in high-vibration environments, such as automotive fixtures or conveyor systems, while the black oxide finish provides essential corrosion protection, prolonging lifespan in humid or abrasive conditions. The 7 1/2" shoulder length and controlled tolerances enable exact positioning for rotating parts like bearings or pulleys, reducing stress and improving overall system efficiency. Ideal for heavy-duty mounting applications, this screw delivers consistent performance where durability and precision are paramount.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional standards, including Class 3A thread fit for tight tolerance and UNC coarse threads (5/8"-11) with a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". Manufactured in compliance with ASME B18.3 and ASTM A574 specifications, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and sustainability in industrial use.