S-8077A473 4-40 Shoulder Screws

Key Features & Benefits at a Glance

• Superior corrosion resistance with 316 stainless steel construction, ideal for harsh environments including marine and chemical applications.
• Enhanced durability and wear resistance from the Black Oxide finish, providing added protection against rust and reducing galling.
• Precise and secure fastening with Class 3A thread fit, ensuring tight tolerances and reliable performance in high-vibration settings.
• High strength for demanding loads, offering 70,000 psi tensile strength and 35,000 psi minimum shear strength to prevent failure under stress.
• Easy installation and removal thanks to the knurled socket head and 5/64" hex drive, allowing for better grip and torque application.
• Versatile shoulder design with an 11/32" shoulder length, providing stable alignment and spacing in assemblies like pulleys and gears.
• Compliance with environmental standards, meeting RoHS 3 and REACH regulations for safe, sustainable use in global markets.

Professional Applications & Engineering Value

This 4-40 UNC thread shoulder screw in 316 stainless steel with a Black Oxide finish addresses common industrial challenges, such as corrosion in humid or chemical-laden environments, by leveraging its high alloy content for long-term reliability. The coarse thread and Class 3A fit ensure quick assembly and minimal loosening in machinery, while the knurled socket head enhances tool engagement for efficient maintenance. Ideal for precision applications like pivots, bearings, and linkages, it reduces wear and extends service life, making it a cost-effective choice for sectors like aerospace, automotive, and manufacturing where high tensile strength and regulatory compliance are critical.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A fit for precise dimensional accuracy, including a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". Manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, it ensures environmental safety and is suitable for rigorous industrial use, backed by a Rockwell B79 hardness rating.