KingLock™ Hydrant Locks

The Original KingLock™ Hydrant Lock

The KingLock takes fire hydrant security to a new level.

The padlock secured housing deters unauthorized access to the hydrant's operating nut.

With the lock in place, the outer shell rotates freely in either direction around an inner operating nut extension that is secured to the hydrant's operating nut, thereby preventing the hydrant operating nut from being turned.

Fast access to the operating nut simply requires removing the padlock and flipping the top cover back 180°. No parts to remove except for the padlock!

The KingLock is designed to mount on any hydrant's standard 1-1/2" pentagon operating nuts. Contact us regarding mounting on other sizes.

KingLocks are made of ductile iron and powder painted red for maximum weather protection.

There are four components:

  • An inner pentagon operating nut adapter mounts to the hydrant's operating nut using five stainless steel set screws (included).

  • An outer shell, which slips over the inner adapter, has a hinged cover with a permanently secured stainless pin and a hasp designed to accept standard padlocks with up to a 5/16" diameter shackle.

  • A stainless steel locking pin inserted through in the outer shell and into a groove in the inner adapter locks the pentagon nut adapter and the outer shell together, yet still allows free 360º left and right rotation.

  • Two hex wrenches are provided for installation of the inner adapter. They also serve as removable retainer pins inserted at each end of the locking pin when the top cover is open. They prevent the locking pin from being accessed unless they are removed when the top is open.
  • Prevent unauthorized access to hydrant operating nut.
  • No component parts to remove to access hydrant operating nut.
  • Uses standard padlocks. No special tools or keys required.
  • Instruction Sheet
Go to Master Locks pages.

See security options here.
KingLock Demo
Weighs 21 lbs.

Go to the KingLock K2 page or if you need one that offers a lower profile see the K3 KingLock page.




KingLock Hydrant Lock
For quantities above 5 please call for quote.