Home / Chain specs / 3/8″ LP · .043″
3/8″ Low Profile · .043″ (1.1 mm) chain
The chain spec for small homeowner & electric/battery saws, pole pruners. Pitch 3/8″ Low Profile, gauge .043″ (1.1 mm), round file 5/32″ (4.0 mm) — sold as Oregon 90PX.
Chain codes by brand
| Oregon | Stihl | Husqvarna | Carlton |
|---|---|---|---|
| 90PX | 61 PMM3 (Picco Micro Mini 3) | H38 | N4C |
Codes are the ones confirmed in manufacturer and dealer data we checked; a dash means we have not verified that brand's code for this spec — match on pitch, gauge and drive links instead.
Saws that use this chain
| Saw | Bar | Drive links | Status |
|---|---|---|---|
| Stihl MS 170 / MS 180 | 16″ | 55 | VERIFIED |
| Stihl MS 170 / MS 180 | 12″ / 14″ | Verify on your bar stamp | VERIFY ON BAR STAMP |
Part numbers on file
- Stihl 61 PMM3 55 — part 3610 005 0055 (OEM)
- Oregon 90PX055 (equivalent)
- Carlton N4C-55 (equivalent)
- Husqvarna H38-55 (equivalent)
- Stihl 61 PMM3 (length by drive links) (OEM)
- Oregon 90PX series (equivalent)
3/8″ Low Profile chain also comes in .050″ (1.3 mm) (Oregon 91PX / 91VXL). The boxes look near-identical, but the gauge must match the groove in your bar — read it off the bar stamp, never guess it from the pitch. See Oregon 72 vs 73.
Questions
What chain codes are 3/8″ Low Profile .043″ chain?
Oregon: 90PX. Stihl: 61 PMM3 (Picco Micro Mini 3). Husqvarna: H38. Carlton: N4C. A dash means we have not verified that brand's code for this spec — match on pitch, gauge and drive links instead.
What file sharpens 3/8″ Low Profile chain?
5/32″ (4.0 mm) round file. File size follows pitch: 3/8″ low-profile takes 5/32″ (4.0 mm), .325″ takes 3/16″ (4.8 mm), and standard 3/8″ takes 7/32″ (5.2 mm).
Which saws use 3/8″ Low Profile .043″ chain?
Among the saws verified on this site: Stihl MS 170 / MS 180. The drive-link count depends on the bar fitted, so match it on your bar stamp.
Can I use a different gauge chain on the same pitch?
No. Gauge is the thickness of the drive links and must match the groove in your guide bar. A thicker chain will not seat; a thinner one wobbles in the groove, wears the bar rails and can derail.
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