S-97345A549 1/4"-28 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
- Precise alignment and smooth rotation ensured by the 2 1/2" shoulder with tight tolerances for reduced wear
- High-strength performance with 70,000 psi tensile and 35,000 psi shear strength for demanding mechanical applications
- Secure, vibration-resistant fastening from the Class 3A fine UNF thread fit, minimizing loosening under load
- Easy installation and removal with the hex socket drive and knurled head for improved grip
- Reliable compliance with ASME B18.3 standards, ensuring consistent quality and interchangeability
- Environmentally safe and RoHS/REACH compliant, meeting global regulatory requirements
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to address critical alignment and durability challenges in industrial settings. The 1/4"-28 UNF fine thread with Class 3A fit provides exceptional clamping force and vibration resistance, essential for machinery, automotive assemblies, and precision instruments. The 2 1/2" shoulder length acts as a precise pivot or spacer, reducing bushing wear and maintaining component alignment under high stress. With its knurled head and hex socket drive, installation is straightforward even in confined spaces. The material's inherent corrosion resistance makes it suitable for marine, chemical processing, and food industry applications, ensuring long-term reliability and reduced maintenance costs.
Specification Summary & Compliance
This shoulder screw features a 1/4"-28 UNF fine thread with Class 3A thread fit for high precision. The shoulder diameter is 5/16" with a tolerance of -0.004" to -0.002", and the shoulder length is 2 1/2" with a tolerance of -0.005" to 0.005". It meets ASME B18.3 specifications and is compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental standards, ensuring safety and regulatory adherence.
