Matching Bars and Chains by Brand

There’s a reason you can’t just grab any 18-inch bar off the shelf and expect it to fit your saw. Pitch, gauge, and drive-link count describe the cutting parts — but what physically bolts a bar to a powerhead is the mount pattern, and that’s brand- and model-specific. Understanding the difference tells you the right order to shop in and saves you from buying a perfectly good bar that won’t go on your saw.

Cutting specs vs. mount: two separate questions

Think of buying a bar as answering two independent questions:

1. Will the chain run on it? → pitch, gauge, drive-link count.
2. Will it bolt to my saw? → mount pattern.

A bar can pass test 1 and fail test 2 completely. That’s the part people miss.

What a mount pattern is

The mount is the slotted tail of the bar. It’s defined by:

• the adjuster (stud) slot length and width,
• the stud hole spacing,
• the oil-feed hole position and size.

These are engineered for a specific family of powerheads. A STIHL small-mount bar will not fit a Husqvarna, and within a single brand the mount changes across saw sizes — a homeowner STIHL and a big pro STIHL often use different mounts. Some aftermarket bars use a universal/multi-mount tail that fits several patterns, but you still confirm against your model.

Chains are more portable than bars

Here’s the upside: chains don’t care about mount patterns. Any chain of the correct pitch, gauge, and drive-link count will run on a matching bar, regardless of which brand of saw the bar is on. So a Husqvarna owner and a STIHL owner running the same 3/8LP .050 56DL setup can buy the exact same chain. It’s the bar that’s tied to the saw.

The right order to shop

1. Start from your saw model — not from an old bar of unknown origin. Your model determines the mount.
2. Go to the Brands page and pick your equipment brand (STIHL, Husqvarna, Echo, EGO, Ryobi, DeWalt and more).
3. Open a listing and confirm your exact model in its fitment list before buying.
4. From there, pitch/gauge/length/DL get you the right chain — or buy a bar-and-chain combo sized to that saw.

When in doubt

If you have the old bar, its stamped part number is the surest match (how to read it). If you only have the saw, shop by brand and verify the model. Either way, the mount is the thing that must match the powerhead — everything else is about matching the chain to the bar.