S-91829A311 1/4"-20 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 18-8 stainless steel and passivated finish for long-lasting performance in harsh industrial environments
- Precise alignment and reduced wear due to the accurately machined shoulder with tight diameter and length tolerances
- High mechanical strength offering a tensile strength of 70,000 psi and Rockwell B55 hardness for reliable, heavy-duty applications
- Secure and easy installation with a standard socket head design compatible with common hex keys
- Wide compatibility with Class 2A UNC coarse threads ensuring easy assembly and interchangeability
- Compliance with environmental and safety standards including RoHS 3 and REACH for use in regulated industries
- Durable thread engagement with a right-hand thread direction and coarse spacing for robust fastening
Professional Applications & Engineering Value
This precision shoulder screw is engineered to address common challenges in machinery assembly, such as component misalignment and pivot point wear. The 18-8 stainless steel construction, combined with a passivated finish, provides excellent resistance to corrosion and oxidation, making it ideal for applications in automotive, aerospace, and manufacturing equipment. The UNC coarse thread and Class 2A fit ensure quick, reliable installation, while the precisely machined shoulder acts as a durable bearing surface or spacer, reducing vibration and extending the lifespan of moving parts. Its socket head design allows for high-torque installation in confined spaces, offering engineers a versatile and dependable shoulder screw solution for demanding industrial environments.
Specification Summary & Compliance
This shoulder screw adheres to Class 2A thread fit and UNC standards for consistent performance. Key dimensional tolerances include a shoulder diameter of 3/8" with a tolerance of -0.001" to 0", and a shoulder length of 5/8" with a tolerance of 0" to 0.002", ensuring precise fit in assembly. The product is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, supporting safe and sustainable industrial use.
