Hidden shackle design provides enhanced security for trailer and equipment doors
Precision-machined from solid 303 stainless steel for durability and corrosion resistance
High-security disc detainer cylinder increases resistance to picking and tampering
Step-back mechanism and enlarged shackle pocket accommodate door hasps
Optional keyed-alike feature allows all locks to share the same key for convenience
Summarized by Shop
Description Single Model 400XL-SS puck padlock with hidden shackle (2 keys included)
Machined from a solid bar of 303 Stainless Steel and comes standard with a high security disc detainer cylinder.
This model is a great upgrade for our trailer door locks. 400XL-SS version puck lock has a step-back and has an enlarged shackle pocket fo
Lock Body Material
303 stainless steel
Lock Core
Cobra standard or Cobra 7 (patented keyway)
Keys Included
2 per lock
Shackle Opening Depth Clearance
32 mm (1 in)
Shackle Opening Width
44 mm (1 3/4 in)
Shackle Opening Height
22 mm (7/8 in)
Body Diameter
73 mm (2 7/8 in)
Body Height
38 mm (1 1/2 in)
Pick Resistant
3 lbs stainless steel
Torch Resistant
Yes
Maintenance
Preventative maintenance required, especially in extreme climates
Summarized by Shop
4.8
69 ratings
5
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1
More the merrier
Just received my 5th set of locks. Love the quality of these and one key. A bit disappointed the same key code was not available for my current locks, however they sent anyway and will send the correct keyed cylinders later when they are available. I hope this happens. Having to use two separate sets of locks for the time being but it’s ok. Hope they show up soon. Thanks proven!!!
I
Ian · March 6, 2026
BEEFY
Great lock solution. Very well built. Solid!
T
Timothy · September 29, 2025
Enclosed trailer lock
These locks are great and gives you peace of mind. I will order me the coupler lock as soon as I can figure which one I need. It is hard for me to see the picture in the add and my coupler has no brand name on it. Fast shipping!
