Increasing Security with Pacific Lock Hidden Shackle Hockey-Puck Padlocks

The diameter and position of the shackle prevent unauthorized entry from pulling the cylinder, core or plug.


“Hockey-puck” style padlocks have become very popular because of their mass, hidden shackle, keying options and the higher level of actual and perceived security. This highly adaptable style of padlock is being used to secure standard padlock and hasp applications as well as vehicle doors, box truck roll up shutter style doors, trailer doors, trash bins and gates. Unlike a conventional padlock, the lock cylinder is almost always in the sideways or downward fixed position, making it more difficult to gain access to the keyway.

This type of padlock uses a large diameter rod style of shackle compared to a conventional padlock shackle. The rod style shackle rotates as the key is turned. The shackle tip is machined to an oval tip with a slot running the circumference. The body of the “hockey-puck” padlock has a machined circular opening at the top. Hardened rods create the receptacle for the shackle tip. The shackle tip enters the opening when the lock cylinder is in the unlocked condition.

To lock the padlock once the shackle is in the closed position, the plug is rotated 90 degrees with the slot in the shackle rotating around the two hardened pins. In the locked condition, the shackle oval tip is 90 degrees out of position to the rectangular opening in the body. The diameter and position of the shackle eliminate many methods of unauthorized entry including pulling the cylinder, core or plug.

The “hockey-puck” body shape can accommodate different surfaces, having the standard option of a flat or stepped back. When first introduced, the 2-7/8” “hockey-puck” padlock was equipped with a standard five pin tumbler padlock keyway lock cylinder. At this time, there are two standard widths available; 2-7/8” and 3” wide bodies. Note: The 3” wide body padlocks will not fit into hasps made for the 2-7/8” wide body padlocks.

Keying options for these hidden shackle padlocks range from the manufacturers’ six pin tumbler cylinder having a padlock keyway to conventional six pin tumbler K-I-K/K-I-L lock cylinders and small format interchangeable cores (SFIC). The conventional lock cylinder and SFIC are available in the larger 3” width body.

“Hockey-puck” padlock hasps are made of heavy gauge metal, designed to resist removal using a pry bar or similar tools. The stepped back version can accommodate some of the conventional padlock hasps without providing sufficient surface area beneath the padlock body.

For this article, we will discuss the Pacific Lock “Hockey-Puck” Padlocks that include the conventional industry standard 2-7/8” body width, and the SFIC and K-I-K/K-I-L models having the 3” body width. The additional width is necessary to accommodate the conventional cylinder and the interchangeable core patent pending sleeve assembly. All of the Pacific Lock “hockey-puck” padlocks are equipped with a 13/32” diameter shackle.

PACLOCK 2-7/8” body width “hockey-puck” padlocks are manufactured of solid steel and hardened. They are equipped with a six pin tumbler lock having the KB6-P0 keyway. The “hockey-puck” padlocks are rekeyable to competitive padlock cylinders including the four pin tumbler.

Note: All PACLOCK 400 Series hockey-puck padlocks have a stepped back to accommodate conventional padlock hasps. All PACLOCK 2170 Series have an entirely flat back.

The 400XIC and the 2170XIC are the 3” body width “hockey-puck” padlocks that accommodate conventional six pin tumbler standard and high security lock cylinders and the six or seven pin tumbler SFICs from lock and core manufacturers including Schlage®, Best®, Falcon®, Arrow®, KSP®, Kaba Ilco®, etc. Contact Pacific Lock for specific applications.

In order to accommodate the conventional lock cylinder and the interchangeable core, Pacific Lock developed their patent pending X and IC sleeve assemblies. The X sleeve assembly is used with conventional K-I-K/K-I-L lock cylinders and the IC sleeve assembly is used with the SFIC. These sleeves are the same overall size permitting them to be installed in the 400XIC and 2170XIC three inch body width “hockey-puck” padlocks. The sleeve assemblies are manufactured of chrome plated brass. They are not interchangeable as the X sleeve has a larger opening than the IC sleeve.

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