Oregon J78 chain: what it fits and what the code means
J78 is a .325" pitch, .058" gauge chain with 78 drive links. It fits 92 saws listed below.
What J78 is
- Pitch
- .325"
- Gauge
- .058"
- Drive links
- 78
The letter J is the chain type, the number 78 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 78 drive links:
| Code | Type | Pitch | Gauge | Family |
|---|---|---|---|---|
| J78 | 21BPX | .325" | .058" | ControlCut |
| H78 | 20BPX | .325" | .050" | ControlCut |
| M78 | 95TXL | .325" | .050" | SpeedCut |
H78, M78: different pitch or gauge. Not a substitute for J78.
Saws that take J78
Questions people ask
What does J78 mean on an Oregon chain?
J is the chain series (21BPX, ControlCut: .325" pitch, .058" gauge). 78 is the number of drive links.
What bar length is J78?
Usually 20". What matters is the drive link count, 78: count the links on your old chain rather than going by the inches.
What file do I need for J78?
A 3/16" round file.