How to Find Your Tool's Model Number (and Why It Matters)

Almost every replacement part — a trimmer spool, a chainsaw chain, a carbon brush, a nailer driver — is made to fit a specific group of tool models. Two trimmers from the same brand can look identical and still take different spools. The fastest way to order the right part the first time is to start with your tool's model number.

Where to find the model number

Look for a small printed label or a molded plate on the tool body. It usually lists the model number, the voltage or amperage, and a serial number.

• String trimmers and edgers: on the motor housing near the trimmer head, or on the shaft just below the handle. Cordless trimmers often have it under the battery slot.
• Chainsaws and pole saws: on the side of the powerhead or under the rear handle. The guide bar has its own markings stamped on the tail end (length, pitch and gauge).
• Nailers and staplers: on the side of the body or the magazine.
• Grinders, drills, saws and rotary hammers: on the nameplate on the motor housing.
• Lawn mowers: on the deck, usually behind the engine or near the rear wheels.

Model number vs. serial number vs. part number

The model number identifies the tool design (for example LST136 or STBA40B210). The serial number identifies your individual unit — you don't need it to order parts. The part number identifies the part itself (for example AF-100 for a spool or 140-4041 for a mower belt). If you still have the old part, its number is printed or molded on it and is just as useful as the model number.

Watch for "Type" numbers

Some brands revise a model without changing its name and add a Type suffix, such as "Type 1" or "Type 2". Internal parts like carbon brushes and gearboxes can change between types, so include the type when you check compatibility.

How to use it on Opuladuo

1. Type your model or part number into the search box at the top of any page.
2. Open the product and check the Compatible models list on the product page.
3. If your exact model isn't listed, don't guess — send us the model number and we'll check fitment before you order.

Tip: the label can fade or peel. Take a photo of it on your phone the day you buy a tool, and you'll always have the model number when you need a part.