OnGuard

Bull Mastiff Round Keyed Padlock

What Our Gearhead® Experts Are Saying:

"I use this lock for securing my gear trailer and trust it to hold up in all weather. The rotary mechanism is super smooth, and the snug shackle design makes it almost impossible to wedge anything into. It’s beefy, reliable, and comes with five serious keys that feel as tough as the lock itself."

When security matters, we reach for the BullMastiff Round Key Padlock. Built for high-security scenarios, this rotary-style lock features a 10mm shackle with minimal clearance, virtually eliminating pry points and standing strong against bolt cutters and brute force. Whether we’re securing a trailer, locker, or gear bin, this lock keeps everything sealed tight and tamper-resistant.

The smooth, one-handed rotary action adds ease of use without sacrificing strength, while the included five heavy-duty F-style keys ensure we always have a backup.