S-91375A490 7/8"-9 x 4" 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
- Exceptional holding power with Class 3A thread fit for secure, vibration-resistant fastening in demanding applications.
- Superior corrosion resistance from the black-oxide finish, extending service life in harsh industrial environments.
- High-strength durability provided by alloy steel and Rockwell C45 hardness, resisting wear and deformation under heavy loads.
- Easy installation and removal with the 1/2" hex drive, allowing for high torque application without stripping.
- Reliable positioning and locking thanks to the cup tip design, which minimizes surface damage and provides positive seating.
- Broad compatibility with 7/8"-9 UNC coarse threads, ensuring a perfect fit with standard components.
- Compliance with major industry standards including ASME B18.3 and ASTM F912, guaranteeing quality and reliability.
Professional Applications & Engineering Value
This black-oxide alloy steel set screw is engineered to solve critical challenges in industrial assembly and machinery. The headless design and hex drive allow for flush mounting and high-torque installation in confined spaces, preventing interference with moving parts. Its Class 3A thread fit and UNC coarse threads ensure precise engagement and superior resistance to loosening under vibration, making it ideal for heavy-duty applications like automotive components, manufacturing equipment, and construction machinery. The cup tip concentrates force for secure locking without significant surface marring, while the Rockwell C45 hardness and corrosion-resistant finish provide long-term reliability in demanding environments, reducing maintenance needs and downtime.
Specification Summary & Compliance
This set screw adheres to Class 3A thread fit for high precision and meets ASME B18.3 and ASTM F912 specifications, ensuring consistent quality and performance. It is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, supporting environmentally responsible sourcing and use in global markets.
