§ Fitment Guide
McCulloch Mac Cat 438 chain size & replacement chart
The McCulloch Mac Cat 438 takes a 3/8" Low Profile™ pitch, .043" / .050" gauge chain. Below: every factory bar length with its exact drive-link count, cross-referenced to Oregon part numbers, plus the OEM parts list.
Fitment matrix
| Bar length | Pitch | Gauge | Drive links | Oregon chains | Bars / combos |
|---|---|---|---|---|---|
| 12" | 3/8" Low Profile™ | .043" / .050" | — | — | — |
| 14" | 3/8" Low Profile or 3/8" Low Profile™ | .043" / .050" / 1.3mm | — | — | — |
| 16" | 3/8" Low Profile or 3/8" Low Profile™ | .043" / .050" / 1.3mm | — | — | — |
| 18" | 3/8" Low Profile or 3/8" Low Profile™ | .050" / 1.3mm | — | — | — |
| 25cm | 3/8" Low Profile™ | .050" | — | — | — |
| 30cm | 3/8" Low Profile™ | .043" / .050" | — | — | 124MLEA041120SXEA041120SDEA041 |
| 35cm | 3/8" Low Profile or 3/8" Low Profile™ | .043" / .050" / 1.3mm | — | 56444191P052E91PX052E91VXL052E | 144MLEA041140SXEA041140SDEA041140SDET041543437 |
| 40cm | 3/8" Low Profile or 3/8" Low Profile™ | .043" / .050" / 1.3mm | — | 56444391P056E91PX056E91VXL056E | 164MLEA041160SXEA041160SPEA041160SDEA041160SDET041543483 |
| 45cm | 3/8" Low Profile or 3/8" Low Profile™ | .050" / 1.3mm | — | 91PX062E91VXL062E | 180SDEA041 |
Source: Oregon part-finder (EU), retrieved 2026-07-06. Part numbers link to the manufacturer's spec page. Always confirm drive-link count against your current chain before ordering.
How to confirm the fit
- Read your bar. The pitch and gauge are stamped on the guide bar near the saw body — e.g.
3/8" LP .050". - Count drive links. Lay the old chain flat and count the teeth that ride inside the bar groove. This number must match exactly; length in inches is not enough.
- Match all three. Pitch, gauge and drive-link count all have to agree with a row in the table above. Two of three is not a fit.
Watch: how to identify chain pitch and gauge
Oregon Products: Identifying Chain Pitch and Chain Gauge Official video from Oregon Products, the manufacturer behind the cross-reference part numbers above.
Official McCulloch resources
- McCulloch manuals & IPL — owner's manual for the Mac Cat 438, including tensioning and maintenance intervals.
- McCulloch parts diagrams — exploded parts diagrams and OEM part numbers.
FAQ
What size chain does a McCulloch Mac Cat 438 take?
The McCulloch Mac Cat 438 runs a 3/8" Low Profile™ pitch, .043" / .050" gauge chain. Available bar lengths: 12", 14", 16", 18", 25cm, 30cm, 35cm, 40cm, 45cm. Match the drive-link count to your bar (see the table above).
How do I know which gauge my Mac Cat 438 chain is?
Check the number stamped on your guide bar near the tail, or measure the drive-link thickness with calipers. Common gauges for the Mac Cat 438 are .043" / .050", .043" / .050" / 1.3mm, .050" / 1.3mm, .050".
Can I put a longer bar on my McCulloch Mac Cat 438?
Oregon lists 12", 14", 16", 18", 25cm, 30cm, 35cm, 40cm, 45cm bars for the Mac Cat 438. Stay within this range — a longer bar than the engine is rated for cuts slowly and accelerates wear.