S-92991A217 1/4"-20 x 1 1/2" 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
- Superior corrosion resistance from durable brass construction, ideal for harsh environments and extending service life
- Exceptional thread engagement and holding power with Class 3A fit UNC coarse threads, ensuring reliable, vibration-resistant fastening
- High-strength performance with a Rockwell B55 hardness rating, providing excellent resistance to wear and deformation
- Secure and flush installation thanks to the headless design and 1/8" hex drive, perfect for confined spaces
- Enhanced grip and component protection from the cup tip, which minimizes surface damage during tightening
- Broad industrial compatibility with a 1/4"-20 thread size and 1 1/2" length, meeting common application requirements
- Guaranteed regulatory compliance with ASME B18.3, RoHS 3, and REACH standards, ensuring safety and environmental responsibility
Professional Applications & Engineering Value
This brass set screw is engineered to solve critical challenges in industrial assembly, where corrosion resistance and precise, secure fastening are paramount. The UNC coarse thread and Class 3A fit provide superior resistance to loosening under vibration, making it ideal for machinery, automotive components, and electrical enclosures. The headless design with a hex drive allows for a flush finish in tight spaces, while the cup tip concentrates clamping force to prevent damage to shafts and gears. Manufactured from brass with a Rockwell B55 hardness, it offers an optimal balance of machinability and durability, ensuring long-term reliability in demanding applications without the risk of galvanic corrosion when used with dissimilar metals.
Specification Summary & Compliance
This set screw adheres to strict dimensional and performance standards, featuring a 1/4"-20 UNC coarse thread with a Class 3A thread fit for high precision. It is manufactured in compliance with the ASME B18.3 specification and is fully RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) compliant, ensuring it meets global environmental and safety regulations for hazardous substances.
