S-91855A331 3/8"-24 Cap Nuts

Key Features & Benefits at a Glance

• Superior corrosion resistance with 18-8 stainless steel construction, ideal for harsh environments and extended service life.
• Precise thread engagement with Class 2B fit ensures reliable, vibration-resistant connections in critical assemblies.
• Fine thread design (UNF 3/8"-24) provides increased tensile strength and improved load distribution compared to coarse threads.
• External hex drive allows for high-torque installation using common tools, speeding up assembly and disassembly.
• Fully enclosed cap end offers a finished appearance and protects threads from damage, debris, and moisture ingress.
• Compliance with RoHS 3 and REACH ensures environmental safety and meets strict industrial regulatory standards.
• Standard dimensions (9/16" width, 5/8" height) guarantee compatibility and easy replacement in existing designs.

Professional Applications & Engineering Value

This 3/8"-24 UNF fine thread cap nut is engineered to address common industrial challenges such as vibration loosening and corrosive degradation. Manufactured from 18-8 stainless steel, it provides excellent resistance to rust and chemical exposure, making it suitable for marine, automotive, and food processing equipment. The Class 2B thread fit and fine thread spacing deliver superior clamping force and fatigue resistance in high-stress applications. The external hex drive facilitates quick, secure fastening with standard wrenches, reducing installation time and maintenance costs. Its enclosed cap nut profile not only enhances safety by covering sharp thread ends but also improves aesthetic integration in consumer-facing products.

Specification Summary & Compliance

This cap nut adheres to UNF (Unified National Fine) thread standards with a size of 3/8"-24 and a Class 2B thread fit for consistent dimensional accuracy. Key specifications include a width of 9/16", height of 5/8", and a thread depth of 3/8". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free from hazardous substances and safe for industrial use.