Manecraft Deep Sea Seals

Posted: 22 May 2025

⚓ Manecraft Deep Sea Shaft Seals: A Smarter Solution Below the Waterline

When it comes to marine shaft sealing, reliability isn’t optional — it’s essential. At Lancing Marine, we recommend Manecraft Deep Sea Shaft Seals as a modern, maintenance-free alternative to traditional packed glands. Developed in the UK by Industrial Rubber Ltd., Manecraft seals are trusted in leisure, commercial, and defence marine sectors for their durability, simplicity, and safety-first design.

🛠️ What Makes Manecraft Seals Different?

Each Manecraft unit consists of two main components:

The Stationary Seat Assembly – Moulded from oil-resistant Chloroprene and embedded with a solid bronze or phosphor bronze sealing face. It’s clamped to the sterntube using stainless steel hose clamps and remains fixed.
The Rotating Seal Assembly – Clamped directly to the propeller shaft and compressed against the stationary face. As the shaft turns, the seal rotates, maintaining a precision seal lubricated and cooled by seawater, aided by a water flush and integrated air vent to eliminate air locks.

This system eliminates the need for packing, grease, or frequent adjustments, making it ideal for operators who value both performance and simplicity.

🆘 Built-In Emergency Protection

All Manecraft Deep Sea Seals include a Red Emergency Sealing Clip — a tamper-proof safety feature that allows you to compress the seal and slow or stop water ingress in the event of damage. This is especially valuable for commercial or offshore vessels where response time matters.

🔧 Note: This clip is factory-fitted for emergency use only and should not be tampered with under normal operation.

🔄 EM vs. EY Series – Which One is Right for You?

Series	Best For	Max Speed	Compression Set	Emergency Clip
EM	Leisure boats and light-duty commercial use	Up to 25 kn	10 mm	Yes
EY	High-load, workboats, and planing vessels	Up to 25 kn	13 mm (½")	Yes

EM Series is ideal for vessels with moderate shaft speeds and tighter engine compartments.

EY Series includes a thicker seal face, handles misalignment better, and is designed for higher stress conditions.

📏 Sizing Guide

EM Series

Model	Shaft Diameter	Sterntube OD	Max Speed
EM2	25–30 mm	40–45 mm	Up to 20 kn
EM3–EM9	Up to 100 mm shaft	—	Up to 25 kn

EY Series

Model	Shaft Diameter	Sterntube OD	Max Speed
EY6–EY17	25–90 mm shaft	45–110 mm OD	Up to 25 kn

For accurate ordering, always measure both shaft diameter and sterntube outer diameter.

🧰 Key Features

Water-lubricated – no grease or oil required
Precision bronze sealing face for longevity
Handles engine/shaft misalignment
Built-in air vent and water injection ports
Tool-free emergency clip for safety
No shaft wear – protects long-term value
Easy to fit – no specialist tools or packing

🔍 Maintenance at a Glance

Action	Recommended Interval
Initial inspection	50–100 hours or 3 months
Standard check-up	Every 200 hrs or 6 months
Bleed air after re-launch	After dry storage or lay-up
Pre-departure check	Before every voyage