§ Fitment Guide
Bosch AKE40S chain size & replacement chart
The Bosch AKE40S takes a 3/8" Low Profile™ pitch, .043" / 1.1mm 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 |
|---|---|---|---|---|---|
| 30cm | 3/8" Low Profile™ | .043" / 1.1mm | — | 90PX045EQ90SG045E | 124MLEA041 |
| 35cm | 3/8" Low Profile™ | .043" / 1.1mm | — | 90PX052EQ90SG052E | 144MLEA041 |
| 40cm | 3/8" Low Profile™ | .043" / 1.1mm | — | 90PX057E90PX056EQ90SG057E | 164MLEA041 |
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 Bosch resources
- Bosch garden tool manuals — owner's manual for the AKE40S, including tensioning and maintenance intervals.
- Bosch spare parts catalogue — exploded parts diagrams and OEM part numbers.
FAQ
What size chain does a Bosch AKE40S take?
The Bosch AKE40S runs a 3/8" Low Profile™ pitch, .043" / 1.1mm gauge chain. Available bar lengths: 30cm, 35cm, 40cm. Match the drive-link count to your bar (see the table above).
How do I know which gauge my AKE40S 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 AKE40S are .043" / 1.1mm.
Can I put a longer bar on my Bosch AKE40S?
Oregon lists 30cm, 35cm, 40cm bars for the AKE40S. Stay within this range — a longer bar than the engine is rated for cuts slowly and accelerates wear.