S-97345A629 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 316 stainless steel construction, ideal for harsh environments and chemical exposure.
- Exceptional thread reliability with Class 3A fit and coarse UNC threads, ensuring secure, vibration-resistant fastening.
- High mechanical strength offering 70,000 psi tensile strength and 35,000 psi minimum shear strength for demanding loads.
- Precise shoulder alignment with controlled diameter and length tolerances for accurate component positioning.
- Easy installation and removal featuring a knurled socket head with a 3/16" hex drive for superior tool grip.
- Compliance with major standards including ASME B18.3, ensuring interchangeability and engineering consistency.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance, meeting global regulatory requirements.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to solve critical alignment and corrosion challenges in industrial settings. Its precision shoulder with tight diameter and length tolerances ensures accurate location of moving parts in assemblies, reducing wear and misalignment. The coarse 5/16"-18 UNC thread and Class 3A fit provide excellent resistance to loosening under vibration, making it ideal for machinery, automotive, and conveyor systems. The knurled socket head with hex drive allows for secure tool engagement in confined spaces. With high tensile and shear strength, it supports heavy-duty applications while the corrosion-resistant 316 material performs reliably in marine, chemical, and outdoor environments, extending service life and reducing maintenance.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a Class 3A thread fit for precise engagement. Key dimensional tolerances include a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002") and shoulder length of 11/32" (tolerance: -0.005" to 0.005"). It is manufactured from 316 stainless steel with a hardness of Rockwell B79 and meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance for environmental safety.
