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Echo CS-400 chain size
40.2 cc homeowner saw on 3/8″ low-profile chain. Oregon's data: 16″ bar, .050″ gauge, 56 drive links, 5/32″ file.
The CS-400 is Echo's 40.2 cc homeowner saw, and like most saws in its class it runs 3/8″ low-profile chain — the smaller “Picco-class” profile, not the full-size 3/8″ of its bigger brother the CS-590. Oregon's product data for the chain it lists for this model gives the full spec for the 16″ setup, including the part most pages omit: the 5/32″ file size.
Chain specifications by fitted bar
| Bar | Pitch | Gauge | Drive links | File | OEM chain | Equivalent chains |
|---|---|---|---|---|---|---|
| 16″ VERIFIED | 3/8″ Low Profile | .050″ (1.3 mm) | 56 | 5/32″ (4.0 mm) | Echo 91PX56CQ family | Oregon 91PX056 (S56) Oregon 91VXL056 Husqvarna H37-56 Stihl 63 PM3 56 |
| Per Oregon's product data: 91-series chain, 3/8″ LP, .050″, 56 DL, fits Echo CS-400 (and CS-310/352/370), file 5/32″. Cross-references include Husqvarna H37-56 and Stihl 63 PM3 56. | ||||||
| 18″ VERIFY ON BAR STAMP | 3/8″ Low Profile | .050″ (1.3 mm) | Verify on your bar stamp | 5/32″ (4.0 mm) | Echo 91-series family | Oregon 91PX / 91VXL family |
| CS-400s are also sold with 18″ bars in North America. We list the count only where a chain-maker listing states it for this model — check your stamp, or count the links on the old loop. | ||||||
Sources: Oregon product data for 91VXL056G / 91PX056G (3/8″ Low Profile, .050″ gauge, 56 drive links, 5/32″ file; fitments include Echo CS-400), including published cross-references to Husqvarna H37-56 and Stihl 63 PM3 56 — checked Oct 2026.
Source list (1)
- Oregon — Product data for 91VXL056G / 91PX056G (3/8″ Low Profile, .050″ gauge, 56 drive links, 5/32″ file; fitments include Echo CS-400; cross-references to Husqvarna H37-56 and Stihl 63 PM3 56) [chain-maker data · retrieved 2026-10-23]
The 60-second check for this saw
- Take the clutch cover off (two nuts) and lift the bar out.
- Read the stamp on the bar tail: length, pitch, gauge, and the drive-link count on most bars.
- Match all three numbers to the table above. If your stamp disagrees with the table, your saw is wearing a non-standard bar — order to the stamp, and tell us via the contact page so we can note the variant.
Full method, with diagrams: How to verify your chain size · Chain identification chart
Match these three numbers at any of the retailers below — the brand on the box matters less than the numbers on it:
- 16″ bar: 3/8″ Low Profile, .050″ (1.3 mm), 56 drive links — look for Oregon 91PX056 (S56) / Oregon 91VXL056 or OEM Echo 91PX56CQ family.
- Oregon Products — the chain maker's own site: full spec data for every Oregon loop, sold through its dealers.
- Acme Tools — US outdoor-power retailer carrying Oregon chain.
- Amazon — widest selection of Oregon and OEM loops in the US and Canada; check the seller's stated pitch/gauge/drive links against the table above.
- Your local saw dealer — the right call for genuine Stihl chain, which Stihl sells through dealers rather than online.
Price guide from listings checked 23 Oct 2026: a single Oregon loop was listed at about $21.43 and 3-packs at about $47.94–$67.99. These are dated examples, not live prices — the checkout price is the real one. The links above are plain retailer links with no affiliate tags and earn no commission: our disclosure.
Questions about the Echo CS-400 chain
What size chain does a Echo CS-400 take?
16″ bar: 3/8″ Low Profile pitch, .050″ (1.3 mm) gauge, 56 drive links (Echo 91PX56CQ family). Other bar lengths are listed as "verify on your bar stamp" because we only print drive-link counts we can trace to a citable source. Always confirm pitch, gauge and drive links on your own bar stamp.
How do I check the chain size on my Echo CS-400?
Take the clutch cover off, lift the bar out and read the stamp on the bar tail: it shows bar length, pitch, gauge and usually the drive-link count. Match all three numbers; if your stamp disagrees with a chart, order to the stamp.
What file size sharpens the Echo CS-400 chain?
5/32″ (4.0 mm) round file, depending on the pitch of the chain fitted. File size follows pitch: 3/8 inch low-profile takes 5/32 inch, .325 inch takes 3/16 inch, and standard 3/8 inch takes 7/32 inch.