S-99612A100 1/4"-20 Hex Nuts

Key Features & Benefits at a Glance

• Exceptional strength and reliability with Grade 5 classification, ensuring dependable performance in demanding mechanical assemblies.
• Superior corrosion resistance from the zinc-plated steel construction, extending service life in harsh or outdoor environments.
• Space-saving thin profile design allows for installation in tight or confined spaces where standard nuts won't fit.
• Secure left-hand thread engagement provides reliable fastening for applications requiring reverse rotation to prevent loosening.
• Precise UNC coarse threading with Class 2B fit ensures easy, rapid assembly and consistent engagement with mating components.
• Durable external hex drive offers excellent tool grip and torque transmission for straightforward installation and removal.
• Full regulatory compliance with RoHS 3 and REACH standards, making them suitable for global industrial and commercial use.

Professional Applications & Engineering Value

This left-hand thread hex nut is engineered to address specific industrial challenges where reverse-threaded fasteners are critical. The Grade 5 zinc-plated steel construction provides a robust and corrosion-resistant solution, ideal for machinery, automotive, and equipment that experience counter-clockwise rotational forces. The thin profile is particularly valuable in compact assemblies, such as electrical enclosures or precision instruments, where space is limited without compromising strength. Its 1/4"-20 UNC coarse thread ensures quick installation and reduces cross-threading risks, while the external hex drive allows for high-torque application with standard tools. This combination of material, design, and threading makes it a reliable choice for maintenance, repair, and OEM applications requiring left-hand thread security.

Specification Summary & Compliance

This nut features a 1/4"-20 UNC coarse thread with Class 2B thread fit for consistent dimensional accuracy. Key dimensions include a width of 7/16" and height of 5/32". It is manufactured from zinc-plated steel and meets Grade 5 strength requirements. The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it is free of hazardous substances and suitable for industrial use worldwide.