Chainsaw Chain Pitch, Gauge & Drive Links
Replacement chains are specified by three measurements: pitch, gauge, and the number of drive links. Get all three right and the chain fits your bar and sprocket; get one wrong and it will not run correctly. We store pitch and gauge on the models in our database.
Pitch
Pitch is the distance between drive links, measured as half the distance between any three consecutive rivets. It is given in inches — common values include 1/4", 0.325", 3/8" (and the low-profile 3/8" lp), and 0.404". Pitch must match the saw's drive sprocket and bar nose sprocket.
Gauge
Gauge is the thickness of the drive link where it sits in the bar groove, given in inches (commonly 0.043", 0.050", 0.058", or 0.063"). The chain gauge must match the bar groove width: too thick will not seat, too thin will rattle and ride loose.
Drive links
Drive links are the toothed tabs on the underside of the chain that engage the sprocket and ride in the bar groove. The drive-link count sets the chain's overall loop length for a given bar and is the most reliable way to order an exact replacement. Bar length alone is not enough, because the same nominal length can take different link counts.
Putting it together
To replace a chain you need the pitch, the gauge, and the drive-link count for your specific bar-and-saw combination. These are usually printed on the bar or in the manual; the pitch and gauge are also listed on our model spec pages where the manufacturer publishes them.
Related on SawFacts
See pitch and gauge on real models:
Frequently asked questions
What is chainsaw chain pitch?
Pitch is the spacing between drive links, calculated as half the distance between three consecutive rivets, expressed in inches (such as 0.325" or 3/8"). It must match the saw's sprocket and bar.
What does chain gauge mean?
Gauge is the thickness of the chain's drive links, which must match the width of your guide bar's groove. Common gauges include 0.050", 0.058", and 0.063".
How do I know how many drive links my chain has?
Count the drive links (the tabs on the underside of the chain) on your current chain, or check the bar or owner's manual. The drive-link count, together with pitch and gauge, identifies the exact replacement chain.