S-90291A859 1/4"-28 ASME B18.3 Set Screws
Set Screws
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Basic Information
Head Parameters
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
Installation & Application
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Key Features & Benefits at a Glance
- Vibration-resistant locking with durable green nylon 6/6 plastic tip that prevents loosening under dynamic loads
- Corrosion-resistant performance in harsh environments thanks to 18-8 stainless steel construction
- Precise thread engagement with Class 3A fit ensuring reliable fastening in critical applications
- Temperature stability maintaining performance across -50° to 250°F operating range
- Secure installation with 1/8" hex drive providing positive torque control in confined spaces
- Industry compliance meeting ASME B18.3 specifications for dimensional accuracy and reliability
- Environmental responsibility with RoHS 3 and REACH compliance for sustainable manufacturing
Professional Applications & Engineering Value
This 1/4"-28 UNF Class 3A hex set screw delivers exceptional engineering value in applications requiring vibration resistance and precise positioning. The 18-8 stainless steel construction provides excellent corrosion resistance for industrial environments, while the green nylon 6/6 plastic tip creates a non-marring, self-locking feature that prevents damage to shaft surfaces. The fine thread configuration with Class 3A fit ensures minimal backlash and superior clamping force in precision machinery, automotive components, and electronic enclosures. The headless design with 1/8" hex drive allows for flush mounting in space-constrained applications, making it ideal for adjustable collars, gears, and pulleys where reliable positioning is critical.
Specification Summary & Compliance
This hex set screw features precise 1/4"-28 UNF fine threads with Class 3A thread fit for superior dimensional accuracy. Manufactured to ASME B18.3 specifications, it ensures consistent performance and interchangeability. The fastener is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental regulations, demonstrating commitment to sustainable manufacturing practices while maintaining Rockwell B80 hardness for durable performance in demanding industrial applications.
