S-92991A540 1/4"-20 x 3/4" 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
- Superior corrosion resistance from high-quality brass construction, ideal for harsh environments and moisture-prone applications
- Exceptional thread precision with Class 3A fit UNC coarse threads ensures reliable, vibration-resistant fastening in industrial assemblies
- Easy installation and removal with the 1/8" hex drive, providing secure tool engagement without stripping
- Enhanced holding power from the cup tip design that creates positive seating and prevents component slippage
- Consistent mechanical performance backed by Rockwell B55 hardness for durable, long-term use under load
- Regulatory compliance assurance meeting ASME B18.3 specifications, RoHS 3, and REACH for global supply chain compatibility
- Space-saving headless design allows flush mounting in confined spaces where protruding fasteners are not feasible
Professional Applications & Engineering Value
This brass set screw delivers critical engineering value in applications requiring non-magnetic, corrosion-resistant fastening. The 1/4-20 UNC coarse thread with Class 3A fit provides superior resistance to loosening under vibration, making it ideal for machinery, precision instruments, and electrical enclosures. The cup tip concentrates pressure for secure component positioning without damaging shafts or hubs. Manufactured to ASME B18.3 standards with Rockwell B55 hardness, it ensures reliable performance in repetitive adjustment scenarios while the 1/8" hex drive facilitates maintenance in tight spaces. Its RoHS 3 and REACH compliance makes it suitable for regulated industries including automotive subassemblies and electronic equipment manufacturing.
Specification Summary & Compliance
This set screw maintains Class 3A thread tolerances per UNC standards with 1/4"-20 coarse threading and right-hand direction. Manufacturing conforms to ASME B18.3 specifications for dimensional accuracy. The product is fully RoHS 3 (2015/863/EU) compliant and REACH (EC 1907/2006) compliant, meeting international environmental and safety regulations for industrial components.
