S-8077A656 1/4"-20 ASME B18.3 Shoulder Screws
Shoulder Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with 316 stainless steel construction, ideal for harsh chemical and marine environments.
- Enhanced durability and wear resistance from the black oxide finish, which also reduces light reflection.
- High-strength performance with 70,000 psi tensile strength and 35,000 psi minimum shear strength for reliable load-bearing applications.
- Precise alignment and smooth rotation ensured by the 3/8" shoulder diameter with tight tolerances for consistent assembly.
- Secure, high-precision threading with Class 3A UNC coarse thread fit, reducing cross-threading risks and ensuring vibration resistance.
- Easy installation and removal using a standard 3/16" hex drive and knurled head for improved grip and torque application.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and environmental responsibility.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical challenges in industrial and precision assembly applications. The combination of corrosion-resistant 316 material and a black oxide finish provides long-term protection in demanding environments such as chemical processing, marine equipment, and outdoor machinery. The 1/4"-20 UNC coarse thread with Class 3A fit ensures secure fastening and minimizes loosening under vibration, while the precisely machined 3/8" shoulder diameter offers stable pivoting and alignment in rotating components like bearings, linkages, and gears. With a knurled head and hex drive, it allows for efficient installation in tight spaces, reducing assembly time and improving operational reliability in high-performance mechanical systems.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with precise dimensional tolerances including a shoulder diameter tolerance of -0.004" to -0.002" and shoulder length tolerance of -0.005" to 0.005". The threading conforms to UNC coarse thread standards with a Class 3A thread fit for high precision. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for industrial use.
