Dieseljet 505

Offering premium quality and effortless comfort, this tender is also a master of practicality. Clever use of space means your eight passengers can stretch out with space for their belongings. Handy for moving a lot of people, but even better for loading it up with fine food for a spot of alfresco dining on a secluded beach. After lunch, drop anchor, unfurl the optional bimini and lower the bathing ladder. Or for those adrenaline seekers, blast away the afternoon waterskiing.

Build my tender

Supreme space, stability and buoyancy

We’ve optimised the cockpit so it offers more space for seating and storage. With a centrally mounted engine and inflatable tubes that sit lower in the water, you'll find the Dieseljet is supreme, whether you're taking tight turns or safely boarding passengers at the jetty.

More torque, less maintenance jet pumps

Our purpose-made jet pumps are not only more efficient, they're also incredibly safe, as there are no exposed moving parts. With stainless steel impellors and double-coated pumps, they provide excellent protection against corrosion, giving you long life with minimal maintenance.

Manoeuvrability in all conditions

Get pinpoint accuracy at both high and low speeds. Our unique hull, control system and jet pump make getting in and out of tight spots an easy task. Drive up to a yacht or handle confined spaces with utmost confidence. At the other end of the scale, you can open up the throttle for superior high-speed straightline tracking and precision controlled turns.

Clear Instrumentation

Have peace of mind with instrumentation to keep you informed of what’s going on above and below the water. As well as standard instruments, you can specify optional extras such as depth sounder, VHF radio and chart plotter. You can even opt to have a removable steering wheel to make storage easier and as an effective anti-theft device.

Sitting comfortably

The seating on a Dieseljet is not only comfortable, it has been designed to keep you drier and more secure. With a commanding central helm position, you can keep an eye on your passengers, and carry between seven and eleven adults.

Easily replaceable tubes

The inflatable tubes on all Williams tenders have been designed to be removed and replaced, quickly and easily. So you can get back on the water with minimal fuss.


Principle Specification
LOA 5.03m/16ft 5in
BEAM 2.01m/6ft 7in
DRY WEIGHT 880kg/1940lb
OVERALL HEIGHT 1.38m/4ft 6in, 1.05m/3ft 5in (with windscreen folded)
ENGINE Yanmar 4JH 110hp Diesel
FUEL CAPACITY 68 litres/18 US gal
SEATING 8 persons
MAX SPEED 64kph/40mph
TYPICAL FITMENT Yachts 30m+/98ft+
Standard Features
  • Bathing ladder
  • Under seat storage
  • 12v DC socket
  • Sealed upholstered seating (removable)
  • Sports boat hull shape
  • Piped deck drains
  • Automatic fire extinguisher
  • Raymarine i70 digital guage
  • Four lifting pad-eyes
  • Forward cleat
  • Removable ski pole
  • Two rear tie down points
  • Automatic bilge pump
  • Bilge blower
  • Battery isolator
  • Tube Repair Kit
  • Footpump (2 stage)
  • Owner's manual
  • Twin lever throttle/Shift control
  • Plug in navigation lights (Port/Starboard/Running)
  • Stainless steel rear handles
  • Teak effect bathing platform/footwells/side-steps
  • Forward seat neoprene/Fabric grab handles
  • Bow U Bolt
  • Piped deck drains
  • Fitted fuel tank
  • Hand-made Inflatable tube with rubstrake & grab handles
  • Bonded tube step pads
  • Boarding pole & sockets
  • Folding helm console with bonded windscreen
  • Adjustable steering wheel
  • 8 standard colour schemes
  • Custom tube, upholstery & moulding colours
  • LED deck lights
  • Optional grey/white teak inlay
  • Shorepower
  • Automatic full tube inflator
  • MCA compliant high visibility patches
  • VHF radio
  • Fusion MP3 (with Bluetooth)
  • Spray dodger
  • Platform kit (Tie downs, lifting strops & over straps)
  • Single point lift
  • Battery charger
  • Telescopic paddle
  • Yacht name on tubes
  • Underwater lights
  • Fresh water shower
  • Automatic bow tube inflator
  • Twin battery installation
  • Chart plotter
  • AIS system
  • Bimini
  • Overall cover
  • Towing kit
  • Electric inflator
  • Stainless steel anchor
  • Yacht name on upholstery
  • Sunbathing pad

Will it fit on my yacht?

Follow the link to the Yacht Fitment page to find out whether the Dieseljet 505 will fit onto your yacht.

Yacht Fitment