§ Fitment Guide
McCulloch MAC4618 chain size & replacement chart
The McCulloch MAC4618 takes a .325" pitch, 1.3mm 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 |
|---|---|---|---|---|---|
| 45cm | .325" | 1.3mm | — | 20LGX072EQ20BP072E20BPX072E20LPX072E | — |
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 MAC4618, including tensioning and maintenance intervals.
- McCulloch parts diagrams — exploded parts diagrams and OEM part numbers.
FAQ
What size chain does a McCulloch MAC4618 take?
The McCulloch MAC4618 runs a .325" pitch, 1.3mm gauge chain. Available bar lengths: 45cm. Match the drive-link count to your bar (see the table above).
How do I know which gauge my MAC4618 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 MAC4618 are 1.3mm.
Can I put a longer bar on my McCulloch MAC4618?
Oregon lists 45cm bars for the MAC4618. Stay within this range — a longer bar than the engine is rated for cuts slowly and accelerates wear.