

Replacement Chainsaw Chain 18" 66 Drive Links Pitch 3/8LP Gauge .050
- Chain Pitch 3/8LP
- .050 Gauge
- Drive Links 66
If you need to identify your chain then you need to know the following information.
Chain Gauge:
Chain gauge is the drive link's thickness where it fits into the guide-bar groove. The gauge of the chain and the gauge of the guide bar must match.
Chain Pitch:
Chain pitch is the distance between any three consecutive rivets divided by two. Pitch defines the size of the chain. Other parts of the cutting elements are pitch-related. The drive sprocket must be the same pitch as the chain, and so must the nose sprocket in sprocket-nose bars.
Number of Links:
The number of drive links need to be counted. These are the teeth on the back of the chain shown below.
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FAQ
Frequently Asked Questions
Questions we get asked by our customers. If you need more help please get in touch via our chat.
We aim to dispatch all orders within 1 business day. Orders placed before 2pm are usually shipped the same day.
We ship 99% of our orders via Royal Mail. If you select the free shipping option, you will typically receive your parts within 4 working days.
We stock both genuine parts and premium aftermarket alternatives under our own brand, HardRidge Parts, designed for durability and performance.
Each product page includes compatibility information. If you’re unsure, just contact us with your model number—we’re happy to help.
Look for a sticker on the lawnmower deck—it will show the model year and often an ART number. We can identify your machine using that information.
We offer a 30-day return policy. Parts must be unused and in their original condition. Please see our Returns Policy page for full details.
At the moment, we only ship within the UK.
Orders under £30 are sent via Royal Mail 2D tracking, which provides delivery confirmation but not live updates. Orders over £30 are sent with a fully tracked service via Royal Mail or Evri.
You can email us atsales@outdoorspares.comor use the contact form on our Contact Us page. We typically respond within 24 hours on business days. We also offer live chat and usually reply straight away, though during busy periods it may take a little longer.