Barbell collars are not the most exciting purchase in a home gym, but they matter more than people give them credit for. The best collar is not always the strongest one. It is the one that matches the way you train.
This comparison looked at four options: Lock Jaw Olympic collars, Lock Jaw Machine collars, Rogue USA Aluminum Collars, and Keppi Fitness Open Collars. I have used the Lock Jaw Olympic collars and Rogue USA Aluminum Collars for years. Lock Jaw and Keppi Fitness sent the newer collars for review.
The short version is that I am still keeping two winners: Lock Jaw Olympic collars for daily use and Rogue USA Aluminum Collars for deadlifts.
Strength Is Only One Part Of The Decision
The holding test was simple: put a 45-pound plate on one end of the bar, drop it, and measure how much the collar moved. It is not a lab test, but it is useful for comparing real-world slippage.
The Lock Jaw Machine collars were the strongest, moving about 0.6 inches across the test. The Rogue USA Aluminum Collars were right behind at roughly 0.66 inches. Keppi Fitness Open Collars with both tabs closed came next at about 0.895 inches, then the Lock Jaw Olympic collars at 1.33 inches, and the Keppi collars with only one tab closed at 1.56 inches.
That makes the Lock Jaw Machine collar the technical strength winner. But strength only matters that much for deadlifts, Olympic lifts, or other work where the plates are hitting the floor. For squats, presses, curls, and most normal home gym training, every collar in the test was strong enough.
Daily Use Still Belongs To Lock Jaw Olympic Collars
The classic Lock Jaw Collars remain my favorite daily-use option because they are light, simple, and easy to open and close with one hand. They are not the tightest collar in the test, but they are the easiest to live with.
That matters. Most collar use is not maximal deadlift work. It is putting plates on for ordinary training, moving quickly, and not wanting to fight the equipment between sets.
With the affiliate discount applied through the link, the Lock Jaw Olympic collars also come down to about $32 from a $40 MSRP. That makes them the best value of the group for most lifters.
Rogue Still Wins For Deadlifts
The Rogue USA Aluminum Collars are harder to open and close than the Lock Jaw Olympic collars, but they are extremely secure. They barely move even on heavy deadlifts, which is why they remain my go-to for pulling and Olympic-style work.
They are not as convenient for every set, and they may involve shipping costs depending on how you buy from Rogue Fitness. But for a collar that needs to stay put when the bar hits the floor, they are still the one I trust most.
Keppi Fitness Has The Most Interesting Design
The Keppi Fitness Open Collars are the most novel design in the test. They snap over the top of the bar instead of sliding on from the sleeve end, they are magnetic, and they can work with one or both tabs closed depending on the situation.
That makes them genuinely convenient in some setups. They hold well, they store easily on a rack, and they are a cool idea. The downside is that opening and closing them is not quite as easy as the best daily-use collars.
If Keppi Fitness can make the release smoother, this design could become a real threat to the standard collar shape.
The Machine Collar Is Strong But Niche
The Lock Jaw Machine collar won the strength test and includes a carabiner for chains or potentially bands. That is clever, but it also makes the collar harder to use.
The clamp is stiff, and the chain attachment is not as valuable in my training as I expected. If you use chains constantly and want a built-in attachment point, it may make sense. For me, the extra strength and carabiner do not outweigh how much more annoying it is to open and close.
Verdict
There is no single best collar for everyone.
For most home gym owners, the Lock Jaw Olympic collar is still the easiest recommendation. It is affordable, easy to use, and strong enough for almost everything.
For deadlifts and anything where the bar is hitting the floor, the Rogue USA Aluminum Collars stay in my rotation. They are stronger, still usable, and proven under heavier work.
The Keppi Fitness Open Collars are the most interesting new design, and I will keep testing them. The Lock Jaw Machine collars are impressively strong, but they are too specialized to replace my regular choices.