Anchor Chain Size Guide & Chart (mm)
This anchor chain size guide is the definitive resource for checking calibration, dimensions, and matching your vessel metrics to the ideal certified short link anchor chain standard.
Why Short Link Anchor Chain Matters
When running an automated windlass or drum winch, standard commercial chain will not suffice. Modern marine gypsies are machined to grip a precise link pitch and diameter, so only calibrated short link anchor chain seats correctly in the gypsy — the wrong profile will slip, jump, or jam under load.
Our engineering data confirms that matching your boat's length and displacement against a certified chain standard — DIN766 or ISO4565 — is the fastest way to a safe, reliable anchoring setup. Use the size chart below to find your chain diameter, then confirm gypsy compatibility before you buy.
Critical Matching Factors
1. Link Calibration: Ensure your chain complies perfectly with DIN766 or ISO4565 specifications before installation.
2. Material Grade: Grade 50 (High Tensile) provides exceptional strength-to-weight ratios for performance yachts.
3. Storage Depth: Deep anchor lockers handle heavy chain lines comfortably, while smaller configurations profit from high-capacity drum setups.
4. Gypsy Compatibility: Confirm your chain's size and standard match the windlass gypsy designation exactly — the correct diameter in the wrong standard will still slip or jump under load.
DIN766 Standard
The most common calibration metric utilized throughout European and Australian marine engineering frameworks. Features a shorter internal link pitch designed precisely for compact gypsy configurations.
ISO4565 Standard
An international standard framework detailing specific link width proportions. Frequently applied to chain diameters of 10mm and larger. Ensure your gypsy matches this distinct designation.
Grade 50 / G50
Premium micro-alloyed steel offering superior working load limits (WLL) compared to basic transport chain profiles. Provides optimal corrosion lifespan when hot-dip galvanized.
Anchor Chain Size Chart (mm)
Use this anchor chain size guide table to cross-reference your boat profile against verified short link anchor chain dimensions.
| Vessel Length Profile | Vessel Displacement | Chain Size (Metric) | Chain Size (Imperial) | Compatible Muir System |
|---|---|---|---|---|
| Up to 6m (20ft) | Under 1,500 kg | 6 mm | 1/4 in | DW06Storm VR600 |
| 6m – 10m (20 – 33ft) | Under 4,000 kg | 8 mm | 5/16 in | DW08DW10Storm VR/VRC1250 |
| 10m – 13m (33 – 43ft) | Under 8,000 kg | 10 mm | 3/8 in | DW12DW15Storm VR/VRC2200 |
| 13m – 18m (43 – 60ft) | Under 15,000 kg | 13 mm | 1/2 in | HR4200 Horizontal |
| 18m – 24m (60 – 80ft) | Under 30,000 kg | 16 mm | 5/8 in | HR2500 CheetahHR3500 Jaguar |
FAQs
Quick answers to the most common questions about selecting, sizing and matching short link anchor chain for your vessel.
What size anchor chain do I need for my boat?
What is the difference between DIN766 and ISO4565 chain?
Can I use ordinary galvanised chain with a windlass?
How do I identify my existing chain?
Need Help Using This Anchor Chain Size Guide?
If this anchor chain size guide doesn't cover your setup, our expert engineers can run dynamic calculations to perfectly calibrate your short link anchor chain requirements with our premium windlass system configurations.