S-97345A648 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 environments and extended service life.
- High-strength performance offering 70,000 psi tensile and 35,000 psi shear strength for reliable load-bearing in demanding applications.
- Precise alignment and spacing enabled by the machined shoulder with tight diameter and length tolerances.
- Secure, high-precision threading with Class 3A UNC coarse threads for excellent grip and vibration resistance.
- Easy installation and removal using a standard 3/16" hex drive and a knurled head for improved tool grip.
- Compliance with major industrial standards including ASME B18.3, ensuring interchangeability and quality.
- Environmentally responsible manufacturing with RoHS 3 and REACH compliance for global supply chain suitability.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw is engineered to solve critical alignment and pivot point challenges in machinery. The precision-machined shoulder provides a consistent bearing surface, eliminating the need for separate spacers and reducing assembly time. Its Class 3A UNC coarse thread ensures rapid assembly and high resistance to loosening under vibration, making it ideal for rotating assemblies, linkages, and fixturing in automotive, packaging, and conveyor systems. The corrosion-resistant 316 material and Rockwell B79 hardness offer long-term durability in moist or chemically aggressive industrial environments, providing reliable performance and reducing maintenance frequency.
Specification Summary & Compliance
This shoulder screw features a 5/16"-18 UNC thread with a Class 3A fit for high precision. The shoulder diameter is 3/8" with a tolerance of -0.004" to -0.002", and the shoulder length is 11/16" with a tolerance of -0.005" to 0.005". It is manufactured in compliance with ASME B18.3 specifications and is RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring adherence to strict quality and environmental standards.
