Collars are the cheapest safety device in the gym, and the one most home lifters under-buy.They’re the clamps that lock your plates against the bar’s sleeve collar so nothing slides mid-rep. A plate creeping outward an inch on one side is enough to tip a loaded bar and turn a good squat into an injury — and it’s entirely preventable with a few dollars of hardware. Here’s what the different types actually do.
Collar vs clip: a note on names
People use “collar” and “clip” loosely and interchangeably. Strictly, the sleeve collar is the fixed flange on the bar that plates butt up against; the collars or clipsyou buy are what lock the plates in place outside them. Below, “collar” means the thing you buy. All of them do the same job — hold the plates — but they differ in grip, speed and price.
The four common types
Spring clips
The classic pinch clips that ship with most bars. You squeeze the handles and slide them on. They’re cheap, light and completely adequate for lighter training and pressing. Their weak spot is heavy, jarring lifts — repeated deadlifts or dropped reps can let them creep. Fine as a starter, easy to upgrade later.
Lockjaw / lever collars
A nylon collar with a lever cam that clamps hard around the sleeve. These are the pragmatic default for a home gym: they snap on and off in a second (great when you’re changing weights every set), grip firmly enough for heavy pulls, and cost little. If you buy one pair of collars, buy these.
Screw / threaded collars
A knob threads down onto the sleeve for a very secure, non-slip hold. They take longer to put on and take off, so they suit setups you don’t change often. The grip is excellent.
Competition collars
Precise, heavier locking collars weighing exactly 2.5kg each, used on the platform. They matter if you compete or want your loaded weight to be exact to the kilo, and they’re overkill for general training. If you’re counting every kilo, remember the collars themselves add to the total — comp collars are part of the loaded weight.
Fit: match the sleeve diameter
Collars are sized to your bar’s sleeve diameter. Modern Olympic bars use 2-inch (50mm)sleeves, so you want 2-inch Olympic collars — the type almost everything is sold in. Older 1-inch “standard”bars need 1-inch collars. If you’re unsure which your bar is, our barbell dimensions guide shows how to check; every bar in our roundups is a 2-inch Olympic bar.
When collars matter most
Two situations make collars non-negotiable. The first is anything you might drop— dropped cleans, snatches and heavy deadlifts with bumper plates, where an unlocked plate can shoot off the bar. The second is uneven or dynamic liftswhere the bar tips (a missed squat, a press that drifts). For slow, controlled, symmetric work at moderate load you can technically get away without them, but there’s no reason to: they’re a few dollars and they remove an entire failure mode.
The bottom line
Buy a pair of 2-inch lockjaw-style collars, keep the spring clips your bar came with as backups, and only reach for screw or competition collars if you have a specific reason. It’s the least glamorous purchase in a home gym and one of the most worthwhile.
Sources
- General strength-equipment principles on collar types (spring, lever/lockjaw, threaded, competition) and sleeve fitment (2-inch Olympic vs 1-inch standard), as reflected in manufacturer specifications and our methodology.
- Competition collar weight (2.5kg each) per Olympic-weightlifting and powerlifting federation loading standards.