S-8077A665 1/4"-20 ASME B18.3 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 from 316 stainless steel and black oxide finish, ideal for harsh environments and extended service life.
- Exceptional mechanical strength with 70,000 psi tensile and 35,000 psi shear strength, ensuring reliability under high-stress conditions.
- Precise alignment and smooth rotation provided by the standard shoulder fit and knurled head, reducing component wear.
- High-accuracy Class 3A thread fit for secure, vibration-resistant fastening in precision assemblies.
- Easy installation and removal with a 3/16" hex drive socket head, allowing for high torque application without slippage.
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory acceptance.
- Durable construction with Rockwell B79 hardness, maintaining integrity in repetitive or high-load applications.
Professional Applications & Engineering Value
This 316 stainless steel shoulder screw with a black oxide finish is engineered to address critical challenges in industrial settings, such as corrosion in chemical processing or marine environments. The 1/4"-20 UNC coarse thread and Class 3A fit provide secure, vibration-resistant connections in machinery, automation systems, and precision equipment. The knurled head enhances grip during manual adjustments, while the standard shoulder ensures accurate component alignment, reducing misalignment and wear. Ideal for applications requiring high tensile and shear strength, this fastener supports reliable performance in robotics, conveyor systems, and assembly jigs, where durability and precision are paramount.
Specification Summary & Compliance
This shoulder screw adheres to ASME B18.3 specifications, with precise dimensions including a shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". The Class 3A thread fit ensures tight tolerances for high-performance applications. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, guaranteeing environmental safety and suitability for global industrial use.
