S-90251A533 1/4"-20 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
- Vibration-resistant locking with nylon patch thread locker maintains secure fastening in high-stress environments from -50° to 250° F
- Superior corrosion resistance from 18-8 stainless steel construction ensures long-term reliability in harsh industrial conditions
- Precision thread engagement with Class 3A fit provides consistent clamping force and reduces assembly variation
- High-strength performance with Rockwell B80 hardness delivers excellent durability under mechanical loads
- Easy installation and removal through hex drive design allows for efficient maintenance and adjustments
- Reliable positioning with cup tip design concentrates clamping force for secure component alignment
- Industry-standard compatibility with UNC coarse thread pattern ensures interchangeability across equipment and applications
Professional Applications & Engineering Value
This 1/4"-20 UNC set screw delivers critical engineering solutions for industrial assembly challenges where vibration loosening compromises equipment reliability. The 18-8 stainless steel construction combined with Rockwell B80 hardness provides exceptional resistance to corrosion and mechanical stress, making it ideal for machinery, automotive components, and manufacturing equipment exposed to demanding environments. The integrated nylon patch thread locker actively prevents back-off under continuous vibration, while the headless design and cup tip enable flush mounting and precise component positioning. These features collectively address common failure points in power transmission systems, pulley assemblies, and precision instrument manufacturing where maintaining alignment and torque integrity is paramount.
Specification Summary & Compliance
Manufactured to ASME B18.3 specifications with Class 3A thread fit for precision dimensional control. Features UNC coarse threads (1/4"-20) with right-hand direction and 1/4" length. Fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, ensuring safe use across global industrial markets.
