S-8077A674 1/4"-28 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 extended service life.
- Enhanced durability and wear resistance from the black oxide finish, which also provides a sleek, non-reflective appearance.
- Precise alignment and secure pivoting enabled by the accurately machined 3/8" diameter shoulder with tight tolerances.
- High-strength performance with a 70,000 psi tensile strength and 35,000 psi shear strength for demanding mechanical applications.
- Reliable, fine-thread engagement with the 1/4"-28 UNF Class 3A thread, ensuring vibration resistance and a secure fit.
- Easy installation and removal using a standard 3/16" hex key, complemented by a knurled head for improved grip.
- Guaranteed quality and safety through compliance with ASME B18.3, RoHS 3, and REACH regulations.
Professional Applications & Engineering Value
This 316 Stainless Steel Shoulder Screw is engineered to address critical challenges in precision assembly and motion control systems. The black oxide finish not only enhances corrosion resistance but also reduces galling in high-stress applications. Its UNF fine thread (1/4"-28) and Class 3A fit provide superior holding power and vibration resistance, making it ideal for machinery, automotive, and aerospace components where precision shoulder screws are essential for maintaining alignment and bearing loads. The combination of a knurled head and hex drive ensures secure handling during installation, while the robust 70,000 psi tensile strength supports heavy-duty use without failure.
Specification Summary & Compliance
This shoulder screw features a 1/4"-28 UNF fine thread with Class 3A fit for high precision, a shoulder diameter of 3/8" with tight tolerances (-0.004" to -0.002"), and a shoulder length of 1/2". It is manufactured in accordance with ASME B18.3 standards and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safety and reliability for global industrial applications.
