Everbilt 1/2 in.-13 Zinc Plated Nylon Lock Nut 811521 - The Home Depot
304 Stainless Steel BSP HEX LOCKNUT 1/2 Inch BSP Threaded Jam Nut with Groove for O-Ring BSP Lock Nut fits Fusti/Anvil and Other Fermenter/Boiler Spigots - Hobby Homebrew
KM Steel Bearing Lock Nuts, Plain Finish, Flat Design | JW Winco Standard Parts
Stainless steel 1/2" NPT lock nut - The Electric Brewery
FS306 SAE O-Ring Face Seal ORFS Bulkhead Locknut | HydraulicsDirect.com
Amazon.com: uxcell G3/4 Lock Nut with Flange, Hex Brass Female Locknut for Plumbing 4pcs : Industrial & Scientific
Nylon Locking Nut High Stainless 19mm Wrench DIN 982 - BelMetric
X2 SHIMANO DISC BRAKE CENTER LOCK RING LOCKING RING LOCKING DEVICE LOCK NUT 2 | eBay
Lock Nuts and O-Rings | Lock Nut Suppliers | ElecDirect