S-99891A135 7/16"-20 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional strength for demanding applications with Grade 8 steel construction, ensuring reliable performance under high stress and vibration.
• Superior corrosion resistance provided by the zinc yellow-chromate plating, extending the nut's service life in harsh or outdoor environments.
• Precise left-hand thread engagement for specialized assemblies where reverse threading is required to prevent loosening from rotational forces.
• Fine thread (UNF) design offers improved adjustment and clamping force distribution compared to coarse threads, ideal for precision equipment.
• Class 2B thread fit ensures consistent, reliable mating with male threads, reducing the risk of cross-threading and assembly errors.
• Standard external hex drive allows for easy installation and removal with common wrenches, streamlining maintenance and repair workflows.
• Rugged dimensional profile (11/16" width, 3/8" height) provides a robust bearing surface for secure fastening in heavy-duty industrial settings.

Professional Applications & Engineering Value

This Grade 8 left-hand hex nut is engineered to address critical challenges in high-stress mechanical systems. The zinc yellow-chromate plated steel construction delivers excellent corrosion resistance, making it suitable for automotive, aerospace, and machinery applications exposed to moisture or chemicals. The 7/16"-20 UNF fine thread provides superior vibration resistance and precise tension control, essential for equipment where safety and reliability are paramount. Its left-hand thread direction is specifically designed for components subject to counter-clockwise rotational forces, preventing unintended loosening. This combination of high-strength material and specialized thread form ensures long-term performance in demanding industrial fastening scenarios, reducing maintenance frequency and downtime.

Specification Summary & Compliance

This hex nut features a 7/16"-20 UNF left-hand thread with a Class 2B thread fit for consistent dimensional accuracy and reliable assembly. Manufactured from Grade 8 steel, it meets high-strength requirements for heavy-duty applications. The product complies with relevant industry standards for UNF thread specifications and is treated with a zinc yellow-chromate plating for enhanced durability. It conforms to RoHS and REACH environmental directives, ensuring safe use in various industrial sectors.