S-91273A582 1/4"-28 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 and shear strength (70,000 psi tensile, 35,000 psi minimum shear) ensures reliable performance under heavy loads.
- Precise Class 2A thread fit with UNF fine threading for secure, vibration-resistant assemblies and reduced loosening.
- Durable black oxide finish enhances wear resistance and provides a sleek, low-reflectivity surface.
- Knurled socket head with hex drive allows for easy installation and removal, even in tight spaces.
- Accurate shoulder dimensions with tight tolerances ensure consistent alignment and smooth rotation in pivoting applications.
- Compliance with RoHS 3 and REACH guarantees environmental safety and regulatory acceptance for global markets.
Professional Applications & Engineering Value
This 18-8 stainless steel shoulder screw is engineered to address common industrial challenges such as misalignment, corrosion, and mechanical stress. The black oxide finish not only resists rust but also reduces galling in high-friction setups. With its UNF fine thread and Class 2A fit, it provides superior holding power in precision machinery, automotive linkages, and electronic enclosures where vibration resistance is critical. The knurled socket head ensures a firm grip during installation, minimizing tool slippage. Ideal for use in pivots, bearings, and rotating assemblies, this fastener delivers long-term reliability and reduces maintenance needs in demanding industrial applications.
Specification Summary & Compliance
This shoulder screw adheres to Class 2A thread fit tolerances for consistent engagement and meets UNF fine thread standards. Key dimensions include a 1/4"-28 thread size, 3/8" shoulder length, and precise shoulder diameter tolerances (-0.004" to -0.002"). It is manufactured from 18-8 stainless steel with a Rockwell B55 hardness and is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental and safety standards are met for industrial use.
