S-8077A657 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 industrial environments and chemical exposure
- Enhanced durability and wear resistance from the black oxide finish, providing long-lasting performance and reduced maintenance
- High tensile strength of 70,000 PSI ensures reliable load-bearing capacity in demanding mechanical applications
- Precise Class 3A thread fit guarantees secure fastening and vibration resistance in critical assemblies
- Knurled socket head design offers improved grip and tool engagement, preventing slippage during installation
- Coarse UNC threading facilitates quicker assembly and disassembly, saving valuable production time
- Compliance with ASME B18.3, RoHS 3, and REACH ensures adherence to industry standards and environmental regulations
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw with a black oxide finish is engineered to address common industrial challenges such as corrosion, high stress, and assembly efficiency. The 1/4"-20 UNC coarse thread and Class 3A fit provide exceptional holding power and vibration resistance, making it ideal for precision machinery, automotive components, and conveyor systems. The knurled socket head enhances tool engagement, reducing installation errors in tight spaces. With a 70,000 PSI tensile strength and 35,000 PSI shear strength, it reliably supports heavy loads while maintaining dimensional stability. Its RoHS 3 and REACH compliance ensures safe use in regulated industries, offering long-term reliability in demanding shoulder screw applications.
Specification Summary & Compliance
This shoulder screw features a 1/4"-20 UNC coarse thread with Class 3A fit for precise tolerance, a 3/4" thread length, and a 7/8" shoulder length with tight diameter and length tolerances. Manufactured from 316 stainless steel with a black oxide finish, it meets ASME B18.3 specifications and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring quality and environmental safety.
