S-91375A133 5-40 x 7/8" 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 Alloy Steel construction, extending service life in harsh industrial environments.
- Exceptional holding power due to Class 3A thread fit, ensuring tight, secure fastening with minimal risk of loosening.
- High durability and wear resistance from Rockwell C45 hardness, maintaining performance under repetitive stress.
- Easy installation and removal with 1/16" hex drive, allowing for efficient assembly and maintenance.
- Reliable grip on shafts and components thanks to the cup point tip, preventing slippage in dynamic applications.
- Broad compatibility with coarse (UNC) thread spacing and right-hand thread direction, suitable for standard industrial assemblies.
- Compliance with major standards including ASME B18.3, ensuring consistent quality and reliability.
Professional Applications & Engineering Value
This 5-40 UNC set screw is engineered to address common industrial challenges such as component slippage and corrosion-induced failure. Made from Black-Oxide Alloy Steel, it provides enhanced protection against rust and oxidation, making it ideal for machinery, automotive, and electrical enclosures exposed to moisture or chemicals. The Class 3A thread fit and cup point tip deliver maximum clamping force, securely locking pulleys, gears, and collars onto shafts without marring surfaces. Its headless design and hex drive allow for flush mounting in confined spaces, streamlining assembly in precision equipment. By combining high Rockwell C45 hardness with coarse UNC threads, this fastener ensures long-term reliability in high-vibration environments, reducing maintenance downtime and improving operational efficiency.
Specification Summary & Compliance
This set screw adheres to Class 3A thread fit for precise dimensional accuracy and consistent performance. It conforms to ASME B18.3 specifications and is manufactured with UNC coarse threads (5-40 size) and a right-hand thread direction. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets environmental and safety standards for industrial use.
