S-97149A308 12-28 Hex Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance from Black-Oxide coated 18-8 Stainless Steel, ideal for harsh industrial environments.
• Precise, reliable fastening ensured by Class 2B thread fit, reducing the risk of cross-threading and assembly errors.
• Enhanced vibration resistance due to the UNF fine thread profile, maintaining joint integrity under dynamic loads.
• Easy installation and removal with a standard external hex drive and 7/16" width for common wrench access.
• Compliance with strict environmental regulations, being RoHS 3 and REACH compliant for global supply chain use.
• Durable, long-lasting performance from the combination of 18-8 stainless steel and black-oxide surface treatment.
• Right-hand thread design for standard application compatibility and straightforward assembly processes.

Professional Applications & Engineering Value

This 12-28 UNF fine thread hex nut in Black-Oxide 18-8 Stainless Steel is engineered to address critical challenges in industrial settings where corrosion resistance and thread reliability are paramount. The fine thread design provides a higher number of threads per inch, offering superior clamping force and resistance to loosening under vibration, making it ideal for machinery, automotive, and aerospace applications. The black-oxide coating enhances surface durability and provides an additional layer of protection against oxidation and chemical exposure, extending the fastener's service life in demanding environments. With its Class 2B thread fit, it ensures consistent, precise engagement with mating components, reducing installation time and minimizing the risk of thread damage. This nut is a reliable choice for engineers seeking a compliant, high-performance fastener that meets rigorous industry standards.

Specification Summary & Compliance

This hex nut features a 12-28 UNF fine thread with Class 2B fit for consistent dimensional accuracy, a width of 7/16", and height of 5/32". Manufactured in accordance with standard UNF thread specifications and external hex drive design, it complies with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring environmental safety and suitability for global industrial use.