S-97768A348 5/16"-18 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 18-8 stainless steel construction and black oxide finish, ideal for harsh industrial environments.
- Exceptional mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable, high-load applications.
- Precise Class 3A thread fit ensures smooth assembly and secure fastening with minimal risk of cross-threading.
- Enhanced grip and torque application from the knurled socket head and 3/16" hex drive, reducing tool slippage.
- Accurate shoulder dimensions with tight tolerances for consistent alignment and spacing in assemblies.
- Broad compliance with ASME B18.3 standards, RoHS 3, and REACH for quality assurance and environmental safety.
- Coarse UNC thread design enables quick installation and high resistance to vibration loosening.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical failure. The black oxide finish enhances durability and provides an additional layer of protection against rust, making it suitable for automotive, machinery, and outdoor equipment. The 5/16"-18 UNC coarse thread and Class 3A fit ensure rapid, secure fastening in high-vibration environments, while the precise shoulder diameter and length facilitate accurate component positioning. With a Rockwell B55 hardness and robust tensile strength, it supports heavy-duty applications like pivots, axles, and rotating assemblies, reducing maintenance needs and improving operational lifespan.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC coarse thread with Class 3A thread fit and a thread length of 1/2". Shoulder dimensions include a diameter of 3/8" (tolerance: -0.004" to -0.002") and length of 1/4" (tolerance: -0.005" to 0.005"). It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring high precision and environmental safety.
