S-8077A855 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 and Black Oxide finish, ideal for harsh industrial environments
- Precise thread engagement with Class 3A fit and UNF fine threads ensuring reliable, vibration-resistant connections
- Exceptional mechanical strength delivering 70,000 psi tensile and 35,000 psi shear strength for demanding applications
- Accurate shoulder positioning with 1" length and tight diameter tolerances for consistent component alignment
- Secure installation and removal with 5/32" hex drive and knurled head for enhanced grip and torque application
- Industry-standard compliance meeting ASME B18.3 specifications for dimensional accuracy and performance
- Environmental responsibility with RoHS 3 and REACH compliance for safe, sustainable manufacturing
Professional Applications & Engineering Value
This 1/4"-28 UNF shoulder screw is engineered to address critical alignment and durability challenges in precision assemblies. The 316 Stainless Steel material, combined with Black Oxide finish, provides outstanding resistance to corrosion and chemical exposure, making it suitable for marine, chemical processing, and outdoor equipment. The Class 3A thread fit and UNF fine threads ensure minimal backlash and secure fastening in high-vibration environments like robotics, automotive, and aerospace systems. The 1" shoulder length with controlled tolerances allows for precise bearing or bushing placement, reducing wear and maintaining operational accuracy. With a hex drive design and knurled head, installation is straightforward even in confined spaces, enhancing assembly efficiency and reliability.
Specification Summary & Compliance
This shoulder screw features a Class 3A thread fit with 1/4"-28 UNF fine threads and a shoulder diameter tolerance of -0.004" to -0.002" for high precision. It conforms to ASME B18.3 manufacturing standards, ensuring consistent quality and interchangeability. The product is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for hazardous substances.
