S-90298A619 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 18-8 stainless steel construction and passivated finish, ideal for harsh industrial environments.
- Precise alignment and secure pivoting ensured by the 1/2" shoulder length with tight ±0.001" diameter tolerance.
- High-strength performance with 70,000 psi tensile strength and Rockwell B55 hardness for demanding mechanical applications.
- Reliable thread engagement provided by Class 3A UNC coarse threads, offering excellent vibration resistance.
- Easy installation and removal with a hex socket drive and knurled head for enhanced grip and torque application.
- Broad regulatory compliance meeting ASME B18.3, RoHS 3, and REACH standards for global industrial use.
- Durable, long-lasting construction that maintains integrity under repetitive loads and environmental stress.
Professional Applications & Engineering Value
This stainless steel shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 18-8 stainless steel material combined with a passivated finish provides exceptional resistance to corrosion, making it suitable for machinery, automotive, and electronic applications exposed to moisture or chemicals. The 1/2" shoulder length and precise shoulder diameter tolerance ensure accurate component positioning, reducing wear and misalignment. With a Class 3A UNC coarse thread and hex socket drive, it offers secure fastening and easy maintenance in high-vibration environments, enhancing operational reliability and reducing downtime for B2B clients.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with a 5/16"-18 UNC thread in Class 3A fit for precise thread engagement. The shoulder features a diameter tolerance of -0.001" to 0.001" and length tolerance of -0.005" to 0.005", ensuring consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use.
