S-91375A553 1/4"-20 x 2 1/2" 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 for extended service life in harsh industrial environments
- Exceptional holding power thanks to Class 3A thread fit ensuring maximum engagement and vibration resistance
- High-strength performance with Rockwell C45 hardness for heavy-duty applications requiring reliable fastening
- Easy installation and removal with 1/8" hex drive providing secure tool engagement in confined spaces
- Secure positioning capability through cup tip design that creates positive locking action on shafts and components
- Reliable thread engagement with UNC coarse threads that resist loosening under vibration and dynamic loads
- Space-saving headless design allowing flush mounting where protruding fastener heads are not feasible
Professional Applications & Engineering Value
This black-oxide alloy steel set screw delivers critical engineering solutions where vibration resistance and corrosion protection are paramount. The UNC coarse thread with Class 3A fit ensures precise engagement in pulleys, gears, and collars, preventing slippage in high-torque applications. The cup tip design bites into shaft materials, creating permanent positioning without damaging components. With Rockwell C45 hardness, this fastener maintains integrity under repeated stress cycles, making it ideal for machinery, automotive, and industrial equipment where reliable set screw performance cannot be compromised. The headless configuration and hex drive facilitate installation in space-constrained assemblies while providing maximum clamping force.
Specification Summary & Compliance
This 1/4"-20 UNC thread set screw features Class 3A thread fit for precision tolerance and meets ASME B18.3 specifications (ASTM F912). The product is fully RoHS 3 (2015/863/EU) Compliant and REACH (EC 1907/2006) Compliant, ensuring environmental regulatory adherence for industrial applications worldwide. Manufacturing conforms to recognized engineering standards for dimensional accuracy and performance reliability.
