S-95289A138 1/4"-20 x 3/4" ASME B18.3 Set Screws
Set 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
- Maximum holding power with Class 3A thread fit for precise, vibration-resistant connections in demanding applications
- Superior corrosion resistance thanks to 18-8 stainless steel construction, ideal for harsh industrial environments
- Enhanced grip and alignment from the extended tip design (0.134"), reducing component slippage
- High durability with Rockwell B80 hardness, ensuring long-term performance under mechanical stress
- Easy installation and removal using a 1/8" hex drive, saving time in assembly and maintenance
- Reliable coarse UNC threading for quick engagement and strong fastening in various materials
- Compliance with industry standards including ASME B18.3, RoHS 3, and REACH for safe, regulated use
Professional Applications & Engineering Value
This 1/4"-20 UNC set screw is engineered to address common industrial challenges like vibration loosening and misalignment in machinery. Made from 18-8 stainless steel, it offers excellent resistance to rust and corrosion, making it suitable for applications in automotive, aerospace, and manufacturing where environmental factors are a concern. The hex headless design allows for flush mounting in tight spaces, while the extended tip provides a deeper bite into components, enhancing security. With a coarse thread and Class 3A fit, it ensures quick, reliable fastening, reducing assembly time and maintenance costs. Ideal for securing gears, pulleys, and other rotating parts, this screw delivers consistent performance in heavy-duty industrial settings, backed by rigorous standards for quality and safety.
Specification Summary & Compliance
This set screw features precise dimensions: 1/4"-20 UNC coarse threads with a Class 3A thread fit for tight tolerances, a length of 3/4", and an extended tip diameter of 0.156" (tolerance: -0.007" to 0"). It complies with ASME B18.3 specifications for set screws, ensuring manufacturing consistency. Additionally, it is RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, meeting environmental and safety regulations for industrial use.
