S-97768A357 5/16"-24 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
- Enhanced corrosion resistance with 18-8 stainless steel and black oxide finish for longevity in harsh environments
- Superior 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 knurled socket head and Class 3A thread fit ensuring minimal backlash
- Reliable rotational stability from the standard shoulder fit and fine UNF threads for vibration-resistant assemblies
- Easy installation and maintenance with hex drive and right-hand thread design compatible with standard tools
- Consistent performance backed by Rockwell B55 hardness and tight shoulder diameter/length tolerances
- Regulatory compliance assurance meeting ASME B18.3, RoHS 3, and REACH for global industrial use
Professional Applications & Engineering Value
This black oxide stainless steel shoulder screw is engineered to address critical challenges in precision machinery, such as misalignment in rotating assemblies and thread fatigue under dynamic loads. The 18-8 stainless steel construction combined with a black oxide finish provides excellent corrosion resistance, ideal for automotive, aerospace, and industrial equipment exposed to moisture or chemicals. The 3/8" shoulder length and Class 3A UNF fine threads ensure secure positioning of components like bearings, gears, and pulleys, reducing wear and maintenance downtime. Its high tensile and shear strength supports heavy-duty applications, while the knurled socket head enhances grip during installation, making it a reliable choice for engineers seeking durability and precision in shoulder screw applications.
Specification Summary & Compliance
This shoulder screw adheres to Class 3A thread fit and UNF fine thread standards with precise dimensions: thread size 5/16"-24, shoulder diameter 3/8" (tolerance -0.004" to -0.002"), and shoulder length 1/2" (tolerance -0.005" to 0.005"). It conforms to ASME B18.3 specifications for dimensional accuracy and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and material reliability.
