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The Model 400-SS is a hidden-shackle puck padlock machined from a solid bar of 303 stainless steel, with a high-security disc detainer cylinder and two keys. It weighs about 3 lbs, which makes it a heavy, torch-resistant, pick-resistant lock built for exposed outdoor use. It is designed as an upgrade for a coupler lock system and has no step-back, so it seats flush. It is not meant for trailer rear or side door hasps: the manufacturer says trailer door gaps are inconsistent and the 400XL is the model for those doors.
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Lowest price we've seen: $309.00 on Nov 12 at The Home Depot. Tracked across 1 store since Nov 12.
The Model 400-SS is a puck padlock with a hidden shackle. The lock body is machined from a solid bar of 303 stainless steel and weighs 3 lbs. It is torch resistant and pick resistant, and it comes with 2 keys.
This model has no step-back. It works with a coupler lock system. It is not meant for rear or side trailer door hasps, because trailer manufacturers leave inconsistent gaps there.
The lock cylinder needs regular maintenance, especially in extreme weather. Graphited fluid seals out moisture and protects against freezing, which extends the life of the lock. Product pictures may not match the current model, as products are revised.