S-97768A298 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
- Exceptional corrosion resistance with 18-8 stainless steel construction, ideal for harsh industrial environments.
- High tensile strength of 70,000 psi ensures reliable performance under heavy loads and stress.
- Precise Class 3A thread fit provides superior engagement and vibration resistance in critical assemblies.
- Black Oxide finish enhances durability and offers additional protection against wear and oxidation.
- Knurled head design allows for easy manual adjustment and secure grip during installation.
- ASME B18.3 compliance guarantees consistent quality and interchangeability in engineering applications.
- RoHS 3 and REACH compliance ensures environmental safety and regulatory adherence for global supply chains.
Professional Applications & Engineering Value
This 1/4"-28 UNF shoulder screw is engineered to address common industrial challenges such as misalignment, component wear, and fastener failure. Made from 18-8 stainless steel with a Black Oxide finish, it resists corrosion in humid or chemical-exposed settings, extending service life in machinery, automation systems, and precision equipment. The fine UNF threading and Class 3A fit ensure tight tolerances, reducing the risk of loosening under vibration—critical for assembly lines or rotating mechanisms. The socket head with hex drive facilitates easy installation in confined spaces, while the knurled texture enhances handling efficiency. Ideal for pivots, spacers, and guides, this screw delivers reliable performance where dimensional accuracy and strength are paramount.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with precise dimensions including a thread size of 1/4"-28 UNF and a Class 3A thread fit for high accuracy. The shoulder diameter and length maintain tight tolerances (e.g., shoulder diameter tolerance of -0.004" to -0.002") to ensure consistent performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting safe and sustainable industrial use.
