S-91327A165 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
- Vibration-resistant locking with permanent nylon patch thread locker, ensuring reliable fastening in dynamic applications from -50° to 250°F.
- Superior corrosion resistance from 18-8 stainless steel and passivated finish, ideal for harsh industrial environments.
- Precise alignment and smooth rotation with a 1-1/2" shoulder length and standard shoulder fit, reducing wear on mating components.
- High load-bearing capacity supported by 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical assemblies.
- Accurate thread engagement with Class 3A fit and 5/16"-18 UNC coarse threads, enabling quick installation and secure connections.
- Easy installation and removal using a hex drive (3/16") and socket head design, accessible in confined spaces.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
This stainless steel shoulder screw is engineered to address common industrial challenges such as component misalignment and vibration-induced loosening. The 1-1/2" shoulder length provides a precise bearing surface for rotating parts like gears and pulleys, minimizing friction and extending equipment life. Made from 18-8 stainless steel with a passivated finish, it resists rust and chemical exposure in demanding settings like machinery, automotive, and electronics. The integrated nylon patch thread locker maintains clamp load under thermal cycling and shock, reducing maintenance needs. With a Class 3A thread fit and UNC coarse threads, it ensures rapid assembly in high-volume production while meeting ASME B18.3 specifications for reliability.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC thread with Class 3A fit for tight tolerances, a shoulder diameter of 3/8" (tolerance: -0.004" to -0.002"), and shoulder length of 1-1/2" (tolerance: -0.005" to 0.005"). It complies with ASME B18.3 manufacturing standards and is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental safety and material integrity.
