• ManeCraft Deep Sea Seals


 Leak Free - Deep Sea Seals keep your bilges dry and clean.

 Trouble Free - Unlike a conventional packed gland, the maneCraft deep sea seal automatically compensates for wear and needs no adjustment.

 Worry Free - The maneCraft deep sea seal has a built in emergency seal for added security and is ABS approved.

 Sizes - to suit shaft diameters from 25mm (1") to 2m (6'6")

 New Generation of Propeller Shaft Seals

 The New maneCraft EM and EY Small Craft Seals

 The new maneCraft propeller shaft seal is designed specially to meet the demanding requirements of today's pleasure and commercial craft. maneCraft the leaders in the development and manufacture of seals for the Navy and Commercial shipping in over 100 nations. Our seals are used on applications as diverse as nuclear submarines and semi-submersibles oil platforms to aircraft carriers and super tankers. maneCraft seals are easy to fit, direct replacement for old style propeller shaft packed glands, they do not require packing, or adjusting, or maintaining and cannot wear a groove in the shaft. Following careful installation, all they need is a quick regular inspection in common with sea cocks, hoses, and other hull fittings under the water line. On monitored test vessels, maneCraft seals have completed in excess of 10,000 hours of service, or 100,000 sea miles and are still in perfect condition. On most vessels, age will be the deciding factor rather than service hours when renewal is necessary.

 Design Features

 Applications -Sealing propeller shafts and rudder stocks for the following marine uses; boat building, boat repair, charter fleets, fishing boats, hire craft and owner retro-fits.

Self Adjusting- These seals automatically compensate for face wear, and unlike gland packing, do not require any adjustment.

 No Shaft Wear - The maneCraft seal rotates with the propeller shaft, and therefore cannot cause wear of the shaft surface.

 Maintenance Free - Once fitted, the seal does not require any maintenance, although a regular inspection should be made in common with other fitting below the waterline.

 Emergency Safety Seal with Tamper Proof Tag - The red tag is designed to prohibit accidental use of the Emergency Safety Seal until required.


 Simple Installation

 New Build

 The maneCraft seal comprises two main components. The stationary seat assembly and the rotating seal assembly, (see Fig 1), both moulded from tough, oil resistant chloroprene. The stationary seat has a solid bronze ring bonded into it and is clamped onto the stern tube with two stainless clips, this part remains stationary. Incorporated into the stationary seat is a red emergency sealing clip. This safety feature is for an emergency only and is protected by a tamper proof tag.

 Under no circumstances should the shaft be rotated whilst this clip is tight. The rotating seal assembly is clamped onto the shaft whilst being compressed against the seat. As the shaft rotates, so does the seal assembly. The seal rotates against the stationary bronze seat, lubricated by the water inside the seal, and the water flush/air vent.


The maneCraft is simple to fit. Most vessels are easily converted to maneCraft and while there are many types of stern gland, they generally fall into three styles. Suggestions for conversions are shown below


Flexible Stern Gland
The old gland is secured to the stern tube by a short length of flexible hose. Simply remove the hose and fit the seat directly to the stern tube.



Rigid Stern Gland
Remove the gland follower and replace in backwards using a sealant between the two flange faces. This will give a short length on which to fit the seat.



Threaded Stern Gland
Remove the large nuts completely to expose the threaded tube. Fill the threads with a sealant and fit the seat to the tube.


 Trouble Free Seal Selection

 There are five easy steps to find the most suitable seal for your particular requirement and vessel. Check the type of stern gland you are currently using on your vessel and match it to the example suggestions as above. If you have a new build make sure there is sufficient stern tube length to fit the seat, it requires a minimum of 32mm (11/4") of free length from the bulkhead to fit the stationary seat

 Check your bearing spacing using the chart below and make sure the seal is not being used on an over long shaft. The seal is not a bearing.

 Measure your shaft and stern tube diameters and note the maximum rpm of the shaft after gearbox reduction. Speed and shaft diameter are important as some high speed sets have support rings.


 example for EM seal:

 Shaft = 25mm or 1"

 Stern tube =38mm or

 11/2" rpm = 1560


 Look at the seal selection tables below an see which sizes match the closet to your requirements. In our example you would need a set number 2 "standard". If your shaft speed exceeds the maximum for the 'Standard' set then refer to us for advice

 Order the set you require and follow the fitting instructions carefully. The information here is for guidance only. A comprehensive set of instructions is included with the seal. A propeller shaft seal is a safety component and it is important that the fitting instructions are read, understood and adhered to for optimum performance of the seal. If in doubt contact us for advice

Bearing Spacing

 A propeller shaft requires bearings at intervals along its length, the interval being determined by the diameter and rotational speed of the shaft. A yacht with a 25mm (1") shaft, turning at 1200 rpm (after gearbox reduction), requires a bearing every 1.2 metres (47"). A commercial vessel with a 50mm (2") shaft at 1000rpm needs a bearing at least every 2 metres (78"). Both these figures are for premium grade stainless steel shafts, these lengths will halve with bronze shafts. It should be noted that a maneCraft seal is not a bearing, and must not be used in a situation with over long spacing. The shaft could start to "whirl" and create problems.

A vessel with two bearings, one in the 'P' bracket and one in the stern tube would mean the distance between each is calculated separately. A bearing on the outboard end of the sterntube would be measured from the bearing to the end of the next supported part of the shaft, usually the gearbox coupling.




Seal Selection Guide

Type EM- Metric Range Dimensions (mm)
Real Size ReferenceShaft DiameterSterntube Outside Dia.Maximum Overall LengthStandard Set Maximum Shaft SpeedHigh Speed Set Maximum Shaft SpeedSupport Ring Required for Shaft sizes
Set No.225-2935-431311800295025-27
Set No.325-2943-511311800295025-27
Set No.430-3443-511311800285030-32
Set No.530-3451-601311800285030-32
Set No.635-4151-601311740275035-38
Set No.735-4160-701311740275035-38
Set No.841-4670-8013115602600all sizes
Set No.946-5170-801311560260046-49

Type EM- Imperial Range Dimensions ( please note, this is not a conversion of metric)

Real Size ReferenceShaft DiameterSterntube Outside Dia.Maximum Overall LengthStandard Set Maximum Shaft SpeedHigh Speed Set Maximum Shaft SpeedSupport Ring Required for Shaft sizes
Set No.211 3/8 -1 11/165 1/16180029501 - 1 1/8
Set No.311 11/16 - 25 1/16180029501 - 1 1/8
Set No.41 1/41 11/16 - 25 1/1618402850all sizes
Set No.51 1/42 - 2 3/85 1/1618402850all sizes
Set No.61 1/22 - 2 3/85 1/16174027501 3/8 - 1 1/2
Set No.71 1/22 3/8 - 2 3/45 1/16174027501 3/8 - 1 1/2
Set No.81 3/42 3/4 - 3 1/85 1/1615602600all sizes
Set No.922 3/4 - 3 1/85 1/1615602600N/A

For sizes larger than these please contact our office.




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ManeCraft Deep Sea Seals

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