5/16-18 Serrated Flange Nut Zinc Plated - FMW Fasteners

5/16-18 Serrated Flange Nut Zinc Plated


Quantity Unit Price
1 to 999 $0.10
1,000+ $0.05
Regular price$0.10 USD

  • $100 orders ship FREE
  • In stock
  • Inventory on the way

5/16-18 Serrated Flange Nut Zinc Plated. This product is a hex nut with a serrated bearing surface beneath the flange that displaces material on the mating surface when the nut is torqued down, forming a connection that resists loosening. These nuts will often see use in applications where vibration is an issue, like on vehicles or industrial machines.

Serrated flange nuts serve as a more-than-suitable replacement for lock washers, and you could even consider them an improvement. Like washers, the nuts help to distribute pressure more evenly throughout the surface. However, they also offer a tighter overall hold than washers, as serrated flange nuts require a significantly higher amount of torque to remove than install due to how they bite into the mating surface. The zinc coating on these flange nuts increases corrosion resistance, as it will hold off excessive moisture and prevent rust.

If you need serrated flange nuts to complete your next project with strength and reliability, FMW Fasteners carries the products you’re looking for. Our customer service reps will go through every aspect of the process — from there, you can customize the exact quantity of nuts that you’ll receive. We offer quick, flat-rate shopping for your convenience. Browse our selection or contact us today with questions.

Most orders placed with us ship in 1-3 business days. More details here on how you can check on the status of your order.

All of our item images are accurate representative images of the product category, however, due to the limitless variations in thread patterns, finishes, and other variables that exist with fasteners, bits and cutting tools, they are representative images only.



They were swift and delivered fast! They had everything I needed.

Eddie Wilcox
Parma, OH


Exactly what we needed and apparently FMW is not only the single source, but the best source. Easy ordering-fast shipping and great communications.

John B.
Salem, OR

Exactly what I needed and received in a timely manner. Thank you!

Mary Marucci
Philadelphia, PA

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