S-91375A309 1/4"-20 x 7/16" ASME B18.3, ASTM F912 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 coating, extending service life in demanding industrial environments.
- Exceptional thread engagement due to Class 3A fit and UNC coarse threads, ensuring reliable, vibration-resistant fastening.
- High-strength performance from alloy steel and Rockwell C45 hardness, providing excellent resistance to wear and deformation.
- Secure, flush installation with headless hex drive design, ideal for applications where a protruding head is not permissible.
- Enhanced gripping power from the cup tip design, which bites into the shaft for a non-slip, permanent hold.
- Broad industry compliance including ASME B18.3, RoHS 3, and REACH, ensuring material safety and standardized quality.
- Easy installation and removal with a standard 1/8" hex drive, simplifying maintenance and adjustments.
Professional Applications & Engineering Value
This black-oxide alloy steel set screw is engineered to solve critical challenges in machinery assembly, automotive components, and precision equipment. Its headless design and cup tip provide a secure, flush-mount solution that prevents axial movement of gears, pulleys, and collars on shafts, even under high vibration. The Class 3A thread fit and UNC coarse threads offer superior holding strength and faster assembly compared to fine threads, reducing the risk of cross-threading. Combined with Rockwell C45 hardness, this screw maintains its integrity under repetitive stress, making it a reliable choice for heavy-duty industrial applications where failure is not an option.
Specification Summary & Compliance
This set screw adheres to precise dimensional standards, including a Class 3A thread fit for tight tolerances and UNC 1/4"-20 coarse threading. It is manufactured in compliance with ASME B18.3 specifications and is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets stringent environmental and safety regulations for use in various global markets.
