S-91273A289 1"-8 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.
- Precise alignment and smooth rotation ensured by the standard shoulder fit and controlled diameter tolerance.
- High mechanical strength with 70,000 psi tensile and 35,000 psi shear strength for demanding applications.
- Secure, non-slip installation provided by the knurled socket head and 1/2" hex drive.
- Reliable thread engagement with Class 2A fit UNC coarse threads for quick assembly and vibration resistance.
- Consistent performance and durability backed by a Rockwell B55 hardness rating.
- Compliance with global environmental standards including RoHS 3 and REACH for safe, responsible sourcing.
Professional Applications & Engineering Value
This 1"-8 UNC shoulder screw is engineered to solve critical alignment and load-bearing challenges in industrial applications. The 18-8 stainless steel material provides excellent resistance to rust and corrosion, making it suitable for machinery exposed to moisture or chemicals. The standard shoulder with precise diameter and length tolerances acts as a pivot, bearing surface, or locator, eliminating the need for additional spacers or bushings and reducing assembly time. The coarse thread and Class 2A fit ensure fast, reliable installation with a high degree of vibration resistance, while the knurled socket head with a 1/2" hex drive prevents tool slippage during high-torque fastening. This combination of features delivers robust performance in equipment such as conveyor systems, robotic arms, and precision fixtures.
Specification Summary & Compliance
This shoulder screw conforms to UNC thread standards with a Class 2A thread fit for consistent, precise engagement. The shoulder diameter tolerance is -0.004" to -0.002", and the shoulder length tolerance is -0.005" to 0.005", ensuring high dimensional accuracy. The product is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance standards, confirming it is free of restricted hazardous substances and suitable for global industrial supply chains.
