Oregon R33 chain: what it fits and what the code means
R33 is a 3/8" LP pitch, .043" gauge chain with 33 drive links. It fits 7 saws listed below.
What R33 is
- Pitch
- 3/8" LP
- Gauge
- .043"
- Drive links
- 33
The letter R is the chain type, the number 33 is the drive link count.
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Check pitch, gauge and drive links on the listing before you order. How this works
Same length, different chain
The number is the length; the letter is the chain. These all have 33 drive links:
| Code | Type | Pitch | Gauge | Family |
|---|---|---|---|---|
| R33 | 90PX | 3/8" LP | .043" | AdvanceCut |
| S33 | 91PX | 3/8" LP | .050" | AdvanceCut |
S33: different pitch or gauge. Not a substitute for R33.
Saws that take R33
Questions people ask
What does R33 mean on an Oregon chain?
R is the chain series (90PX, AdvanceCut: 3/8" LP pitch, .043" gauge). 33 is the number of drive links.
What bar length is R33?
Usually 8". What matters is the drive link count, 33: count the links on your old chain rather than going by the inches.
What file do I need for R33?
A 4.5 mm round file.