S-91381A077 2-56 x 1/4" 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
- Superior corrosion resistance with black-oxide alloy steel construction, extending service life in harsh industrial environments.
- Precise, secure fastening thanks to Class 3A thread fit, ensuring minimal backlash and reliable holding power.
- Protects sensitive surfaces with a soft brass tip, preventing marring or damage to components during clamping.
- High-strength durability from Rockwell C28 hardness, providing excellent resistance to wear and deformation.
- Easy installation in confined spaces with a headless design and hex drive, allowing for straightforward tool access.
- Wide compatibility with UNC coarse threads and right-hand direction, suitable for standard inch-based assemblies.
- Compliance with major standards including ASME B18.3, RoHS 3, and REACH, ensuring safety and regulatory adherence.
Professional Applications & Engineering Value
This 2-56 UNC set screw is engineered for demanding applications where precision and surface protection are critical. The black-oxide alloy steel offers enhanced corrosion resistance, ideal for machinery, automotive, and electronics assemblies exposed to moisture or chemicals. Its Class 3A thread fit and coarse thread spacing provide a tight, vibration-resistant hold, reducing the risk of loosening in dynamic environments. The soft brass tip is particularly valuable for securing delicate parts like shafts or gears without causing scratches or indentation, making it a top choice for industrial set screws in precision equipment. Combined with a hex drive for easy torque application, this fastener delivers reliable performance in tight spaces, ensuring long-term operational integrity.
Specification Summary & Compliance
This set screw adheres to Class 3A thread fit for high precision in inch measurements, with UNC coarse threads and right-hand direction. It meets ASME B18.3 manufacturing specifications, ensuring dimensional accuracy and reliability. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, confirming it is free from hazardous substances and safe for various industrial uses.
