S-90311A176 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 or washdown environments.
- Vibration-proof secure fastening ensured by the permanent nylon patch thread locker, effective from -50° to 250°F.
- High-strength reliability with a tensile strength of 70,000 psi and a minimum shear strength of 35,000 psi for demanding applications.
- Precise alignment and smooth rotation provided by the 3/8" diameter shoulder with a controlled tolerance fit.
- Easy installation and high-torque capability with the hex socket drive and knurled head for improved grip.
- Consistent, high-quality threads with Class 3A fit UNC coarse threads for reliable engagement and strength.
- Compliance and peace of mind by meeting ASME B18.3 specifications and being RoHS 3 and REACH compliant.
Professional Applications & Engineering Value
This 5/16"-18 UNC shoulder screw is engineered to solve critical challenges in industrial assembly and precision machinery. The 316 Stainless Steel material provides exceptional resistance to chemicals and saltwater corrosion, making it suitable for food processing, marine, and chemical equipment. The integral 1 3/4" shoulder length acts as a precise shaft or pivot, eliminating the need for separate spacers and reducing assembly components. Combined with the permanent nylon patch thread locker, it effectively prevents loosening under severe vibration, a common failure point in motors, conveyors, and robotic arms. This design ensures long-term operational integrity, reduces maintenance downtime, and enhances the overall reliability of your mechanical systems.
Specification Summary & Compliance
This shoulder screw features Class 3A thread fit and UNC coarse threads (5/16"-18) for high precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 1 3/4" with a tolerance of -0.005" to 0.005". It is manufactured in compliance with the ASME B18.3 standard and adheres to RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations.
