S-97345A828 1/2"-13 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance in harsh environments thanks to 316 stainless steel construction, ideal for chemical, marine, and outdoor applications.
• Exceptional mechanical strength with 70,000 psi tensile strength and 35,000 psi minimum shear strength, ensuring reliable performance under high stress.
• Precise Class 3A thread fit for secure, vibration-resistant assemblies and reduced risk of loosening in dynamic applications.
• Knurled socket head design provides enhanced grip for easier installation and removal, even with gloved hands or in slippery conditions.
• Generous 2-1/2" shoulder length allows for accurate component alignment and acts as a pivot or bearing surface, minimizing wear.
• 5/16" hex drive compatibility ensures straightforward installation with standard tools, speeding up assembly processes.
• Compliance with ASME B18.3, RoHS 3, and REACH guarantees product quality, safety, and environmental responsibility for global supply chains.

Professional Applications & Engineering Value

This 316 stainless steel shoulder screw is engineered to address critical challenges in precision machinery, automation systems, and heavy-duty equipment. The 1/2"-13 UNC coarse thread with Class 3A fit ensures tight tolerances and resistance to vibrational loosening, which is vital for maintaining alignment in assemblies subject to dynamic loads. The knurled socket head enhances tool engagement, reducing slippage during installation in confined spaces. With a 2-1/2" shoulder providing a stable bearing surface, it minimizes friction and wear on moving parts, making it ideal for pivots, guides, and rotating mechanisms in industrial, automotive, and aerospace applications. Its corrosion-resistant properties ensure longevity in humid or chemically aggressive environments, reducing maintenance frequency and downtime.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit for high precision and meets ASME B18.3 specifications, ensuring dimensional accuracy and interchangeability. Key tolerances include a shoulder diameter of 5/8" with a tolerance of -0.004" to -0.002" and a shoulder length of 2-1/2" with a tolerance of -0.005" to 0.005". It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006), confirming its suitability for environmentally regulated markets and safe use in various industrial sectors.