S-91273A181 5/16"-18 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 for long-lasting performance in harsh industrial environments.
- Enhanced assembly precision due to the 2-1/2" shoulder with a tight ±0.005" length tolerance, ensuring accurate component alignment.
- High mechanical strength offering 70,000 psi tensile strength and 35,000 psi shear strength for reliable load-bearing in demanding applications.
- Easy installation and removal with a hex socket drive and knurled head, providing a secure grip and reducing tool slippage.
- Consistent thread engagement via 5/16"-18 UNC coarse threads with Class 2A fit, facilitating quick assembly and reducing cross-threading risks.
- Durable wear resistance from Rockwell B55 hardness, maintaining integrity under repetitive use and vibration.
- Compliance with global standards including RoHS 3 and REACH, ensuring safety and environmental responsibility for international supply chains.
Professional Applications & Engineering Value
This 18-8 Stainless Steel shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. Its 2-1/2" shoulder length with minimal tolerance variations ensures exact positioning of components like gears, pulleys, and bearings in industrial machinery, reducing wear and misalignment. The coarse UNC threads and Class 2A fit enable rapid, secure fastening, while the hex socket knurled head allows for easy torque application in confined spaces. Made from corrosion-resistant stainless steel, it withstands exposure to moisture and chemicals, making it ideal for automotive, aerospace, and manufacturing equipment where reliability and high tensile strength are paramount.
Specification Summary & Compliance
This shoulder screw adheres to Class 2A thread fit and UNC coarse thread standards for consistent performance. Dimensions include a shoulder diameter of 5/16" with a tolerance of -0.004" to -0.002" and a shoulder length of 2-1/2" with ±0.005" tolerance. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety requirements for global use.
