Nylon Lock Nuts 304 Stainless Steel

Stainless Steel Nylon Insert Hex Lock Nuts

Lock Nuts with a Nylon Insert in Corrosion Resistant 304 Stainless Steel

  • Hexagonal shape
  • Nylon material creates pressure against the fastener
  • Forces the bottom threads of the fastener against the top threads of the bolt
  • Creates a better hold
  • Locks the nut into place so it will not vibrate loose
  • Retain locking ability up to 250 °F (121 °C)
  • Also referred to as Nylon Lock Nuts or Nyloc Nuts

To prevent or stop galling (also known as seizing or locking-up) on stainless steel fasteners, we recommend using an anti-seize thread lubricant from our line of
MRO Solutions

Stainless Steel fasteners rubbing against each other (during installation) may cause a reaction known as Galling. The chance of galling increases significantly when a nylon insert is added to the nut. To limit the extra friction created by the nylon insert, Waxed Nylon Insert Lock Nuts are also available.

*Even when using Waxed Nylon Insert Lock Nuts, we still recommend using an MRO Anti-Seize Solution to further deter thread galling during any stainless steel fastener installation.

Nylon Insert
Lock Nut Size
Width Across Flats Height / Thickness
#4 0.251" 0.153"
#6 0.313" 0.188"
#8 0.345" 0.239"
#10 0.376" 0.249"
#12 0.439" 0.328"
1/4" 0.439" 0.328"
5/16" 0.502" 0.359"
3/8" 0.563" 0.468"
7/16" 0.627" 0.468"
1/2" 0.752" 0.609"
0.877" 0.656"
5/8" 0.940" 0.765"
3/4" 1.064" 0.890"
7/8" 1.252" 0.999"
1" 1.44" 1.078"
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Product Specifications
Corrosion Resistant
304 Stainless Steel
Product Type
Nylon Insert Lock Nut
Thread Direction
Right Hand
Tolerance (IFI)
Actual measurements may vary slightly +/- depending on production run within IFI Tolerances
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