S-8077A492 4-40 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 component alignment ensured by the knurled head and standard shoulder fit, reducing assembly time and improving positional accuracy.
• High load-bearing capability with 70,000 psi tensile strength and 35,000 psi shear strength, providing reliable performance under stress.
• Secure, slip-resistant fastening using a 5/64" hex drive and socket head design, allowing for high torque application and easy installation.
• Consistent thread engagement due to Class 3A thread fit and UNC coarse threading, minimizing cross-threading and ensuring repeatable assembly.
• Enhanced durability from Rockwell B79 hardness, offering long service life and resistance to wear in demanding applications.
• Compliance with global regulations including RoHS 3 and REACH, ensuring environmental safety and suitability for international markets.

Professional Applications & Engineering Value

This 4-40 UNC shoulder screw in 316 stainless steel with a black oxide finish addresses critical engineering needs in precision assemblies. The knurled head and precise shoulder dimensions provide stable positioning for components like bearings, gears, and linkages, reducing misalignment and vibration. Its corrosion-resistant properties make it suitable for marine, chemical, and outdoor equipment, while the Class 3A thread fit and coarse thread spacing ensure quick, reliable fastening in automated production lines. The hex drive socket head allows for efficient installation in confined spaces, enhancing productivity in industries such as aerospace, automotive, and electronics manufacturing where durability and precision are paramount.

Specification Summary & Compliance

This shoulder screw adheres to UNC thread standards with a Class 3A thread fit for tight tolerance and reliable performance. Dimensions include a thread size of 4-40, shoulder diameter of 1/8" (tolerance: -0.004" to -0.002"), and shoulder length of 5/16" (tolerance: -0.005" to 0.005"). It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for regulated industrial applications.