S-91273A584 1/4"-28 Shoulder Screws
Shoulder Screws
Image may differ from product. See technical specification for details.
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, ideal for harsh industrial environments.
- Enhanced durability and wear resistance from the black oxide finish, which also reduces light reflection.
- Precise alignment and smooth rotation ensured by the knurled head and standard shoulder fit for consistent assembly.
- High tensile strength of 70,000 psi and minimum shear strength of 35,000 psi for reliable performance under heavy loads.
- Accurate and secure fastening with Class 2A thread fit and 1/4"-28 UNF fine threads, minimizing loosening.
- Easy installation and removal using the hex drive style and 1/8" drive size for efficient tool engagement.
- Compliance with RoHS 3 and REACH regulations, ensuring safety and environmental standards in industrial applications.
Professional Applications & Engineering Value
This black oxide shoulder screw is engineered to address critical needs in precision machinery, such as minimizing misalignment and reducing wear in rotating assemblies. The 18-8 stainless steel material provides excellent corrosion resistance, while the UNF fine threads and Class 2A thread fit ensure tight tolerances for vibration-resistant connections. Commonly used in industrial applications like pivots, gears, and linkages, the 3/8" shoulder length offers stable support, and the knurled head enhances grip during manual adjustments. Its 70,000 psi tensile strength makes it suitable for high-stress environments, improving equipment longevity and reducing maintenance costs.
Specification Summary & Compliance
This shoulder screw adheres to precise dimensional standards, including Class 2A thread fit for consistent engagement and UNF thread type with fine spacing. Shoulder diameter and length tolerances are tightly controlled (e.g., shoulder diameter: -0.004" to -0.002") to ensure reliable performance. It complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming its suitability for industrial use without hazardous substances.
