S-8077A779 3/8"-16 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 and black oxide finish, ideal for harsh industrial environments
- High load-bearing capacity with 70,000 psi tensile strength and 35,000 psi shear strength for demanding applications
- Precise alignment and reduced wear thanks to the 2" shoulder with tight diameter tolerance for stable component positioning
- Easy installation and removal with knurled socket head and 5/16" hex drive, enhancing assembly efficiency
- Reliable thread engagement through Class 3A thread fit and 3/8"-16 UNC coarse threads, minimizing loosening risks
- Durable performance backed by Rockwell B79 hardness, ensuring long-term mechanical integrity
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for safe, regulated use
Professional Applications & Engineering Value
This shoulder screw is engineered to address critical challenges in machinery and equipment assembly, where precise shaft alignment and resistance to rotational forces are essential. The 316 stainless steel material, combined with a black oxide finish, provides exceptional protection against corrosion in moist or chemical-exposed settings, such as marine, food processing, or outdoor industrial applications. The 2" shoulder length and controlled diameter tolerance ensure accurate spacing and reduced friction in moving parts, while the UNC coarse threads and Class 3A fit offer quick, secure fastening in high-vibration environments. Ideal for use in pivots, gears, and linkages, this component enhances operational reliability and minimizes maintenance needs in heavy-duty industrial systems.
Specification Summary & Compliance
This shoulder screw adheres to precise dimensional standards, including a Class 3A thread fit for superior thread engagement and a shoulder diameter tolerance of -0.004" to -0.002". It meets ASME B18.3 specifications for consistency and performance, and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.
