S-90298A215 8-32 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, ensuring long-term reliability in harsh environments
- Precise alignment and smooth rotation thanks to the 3/4" shoulder with tight diameter tolerance (-0.001" to 0.001") for reduced wear in mechanical assemblies
- High-strength performance delivering 70,000 psi tensile strength and Rockwell B55 hardness for demanding industrial applications
- Secure, vibration-resistant fastening achieved through Class 3A thread fit and UNC coarse threading for reliable installation
- Easy installation and removal with hex socket drive (3/32") providing positive torque transfer and reduced tool slippage
- Industry-standard compliance meeting ASME B18.3 specifications for consistent quality and interchangeability
- Environmental responsibility with RoHS 3 and REACH compliance, ensuring safe use in regulated markets
Professional Applications & Engineering Value
This 8-32 UNC shoulder screw is engineered to address critical alignment and durability challenges in precision machinery. The 18-8 stainless steel material, enhanced by a passivated finish, provides excellent resistance to oxidation and chemical exposure, making it ideal for automotive, aerospace, and food processing equipment. The 3/4" shoulder length acts as a precise pivot or spacer, minimizing friction and maintaining component alignment under dynamic loads. With its socket head design and Class 3A thread fit, it ensures secure fastening in high-vibration environments, reducing maintenance downtime and improving assembly life cycle.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with UNC coarse threading (8-32 size) and precise shoulder dimensions (diameter tolerance: -0.001" to 0.001", length tolerance: -0.005" to 0.005"). Manufactured in compliance with ASME B18.3 standards, it also meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations for hazardous substance control.
