S-97345A416 4-40 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, ideal for harsh industrial environments and extended service life.
- High mechanical strength offering 70,000 psi tensile and 35,000 psi shear strength for reliable performance under heavy loads.
- Precise Class 3A thread fit ensures secure, vibration-resistant fastening in demanding applications.
- Knurled socket head design provides enhanced grip and easier installation with standard hex tools.
- Accurate shoulder dimensions with tight tolerances for consistent alignment and spacing in assemblies.
- Compliance with RoHS 3 and REACH standards, ensuring environmental safety and regulatory acceptance.
- Coarse UNC thread profile enables quick assembly and disassembly, reducing maintenance time.
Professional Applications & Engineering Value
This 4-40 UNC Class 3A shoulder screw is engineered to address critical alignment and durability challenges in precision machinery, automation systems, and electronic enclosures. The 316 stainless steel material provides exceptional resistance to corrosion from chemicals, moisture, and salt spray, making it suitable for marine, chemical processing, and outdoor equipment. The knurled socket head with a 5/64" hex drive ensures tool engagement without slippage, while the precisely machined shoulder maintains component spacing and rotational stability. Its high tensile and shear strength supports dynamic loads, reducing the risk of fastener failure in high-stress applications such as robotics, conveyor systems, and precision instruments.
Specification Summary & Compliance
This shoulder screw adheres to UNC coarse thread standards with a Class 3A thread fit for superior precision. Key dimensions include a 1/4" shoulder length with a tolerance of -0.005" to 0.005" and a shoulder diameter of 1/8" with a tolerance of -0.004" to -0.002". It is manufactured to meet RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliance, ensuring it is free from hazardous substances and suitable for global industrial use.
