S-8077A584 5/16"-18 ASME B18.3 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
• Precise alignment and smooth rotation ensured by the knurled head and standard shoulder fit, reducing assembly time and wear.
• High tensile strength of 70,000 psi and minimum shear strength of 35,000 psi for reliable performance in heavy-duty applications.
• Class 3A thread fit and UNC coarse threading provide secure, vibration-resistant fastening with minimal risk of loosening.
• Hex socket drive design allows for easy installation and removal in confined spaces, improving maintenance efficiency.
• Rockwell B79 hardness enhances durability and resistance to deformation under load, extending service life.
• Compliance with ASME B18.3, RoHS 3, and REACH ensures quality, safety, and environmental standards are met for global use.

Professional Applications & Engineering Value

This 5/16"-18 UNC shoulder screw is engineered to address critical challenges in precision machinery and industrial assemblies. The 316 stainless steel material, combined with a black oxide finish, offers exceptional resistance to corrosion and chemicals, making it suitable for applications in marine, chemical processing, and outdoor equipment. The knurled head provides enhanced grip for manual adjustments, while the standard shoulder diameter and length ensure accurate component alignment and reduced friction in rotating parts. With UNC coarse threads and a Class 3A thread fit, it delivers reliable clamping force and vibration resistance, minimizing downtime in high-stress environments like automotive jigs and conveyor systems. This screw’s robust design supports efficient assembly and long-term reliability in demanding B2B settings.

Specification Summary & Compliance

This shoulder screw adheres to precise dimensional tolerances, including a Class 3A thread fit for tight fastener engagement and shoulder diameter tolerance of -0.004" to -0.002". It conforms to ASME B18.3 standards for consistent quality and performance. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring it meets environmental and safety regulations for hazardous substances.