Manufacturer of Saturn Inflatables Since 1999

18' Inflatable Boats SD518

Short description:
MSRP: $3,798.00  
Only 2 left in stock

The 18' Saturn inflatable boats SATURN SD518 are our largest vessels.

New Model V3.0 - German Heytex PVC, Heat Welded Seams, Fiberglass Covered Transom, Premium Quality.

It comes with aluminum floor and Its ready to be used as commercial work boat, for fishing or diving, or just a pleasure day on a a water. The SD518 is a latest addition to the SATURN line of high performance heavy-duty inflatable boats.

Saturn Inflatable Boat SD518

18' SATURN SD518 inflatable boats are made from heavy-duty quality PVC fabric, and can handle up to a maximum of 10 persons.

Deflated, the SD518 boat will fold to the size of one large and heavy bag with tubes and another large and heavy flat bag with a floor. Once deflated and folded, the SD518 inflatable boat can be stored in the back of your SUV or minivan, large closet of your apartment or in a garage.

Double layers of fabric at the bottom of the tubes and a rub-strake protector along the keel provide extra protection from sharp rocks and abrasive sand. The safety valve will prevent excessive air pressure in the boat's chambers.

Grommet splash guard with grab safety rope moved off-center to create comfortable seating surface on top of oversized tubes.

18' SD518 inflatable motor boats come equipped with with a sectional heavy-duty aluminum floor. The bow section is made of a marine grade plywood floor covered with a gray resin. Aluminum floor installation steps are here.


  • All around rope grab line.
  • Separate internal air chambers.
  • 3 one-way drain valves with plug.
  • All around, durable rubber strike.
  • Safety valve to prevent over inflation.
  • Stainless steel D-rings for easy towing.
  • Reliable flat air valves with pushpin design.
  • Front bow D-ring with integral lifting handle.
  • Spare rope for attaching anchor is included.
  • Double layer of fabric at the bottom of tubes.
  • Holds up to 10 persons maximum or 6 comfortably.
  • Deep inflatable V-keel with a rub strake protector.
  • Heavy-duty marine grade aluminum floor is included.
  • Extra thick heavy-duty marine grade plywood transom.
  • Lightweight and strong removable aluminum seat benches.
  • Equipment: repair kit, 3 seat benches and carry bags.
  • Free, complimentary generic high-volume hand pump is included.
  • For the list of optional available Accessories please click here.

You can download Saturn SD518 inflatable boat data sheet in PDF format

Video of SATURN SD518 with 25HP Motor.

Quick Tip! Worried about the heavy weight of a hard floored boat? Don't break your back! Get a foldable hand cart from any retail store to carry the folded boat around. Even inexpensive dolly movers will work great for transporting a folded or fully inflated boat. Get dinghy dolly wheels to easily move the inflated boat across the shore and into the water.

Saturn Inflatable Boats Specifications:

Overall Length:
Inside Length:
Overall Width:
Inside Width:
Tube Diameter:
Person Capacity:
Loading Capacity:
2500 lbs
Max Motor Power:
50 HP (15" shaft / 175 lbs)
Tube Shipping Size:
Tube Weight:
136 lbs
Floor Weight:
123 lbs
Tube Shipping Weight:
139 lbs
Floor Type:
Anodized Aluminum
Floor Shipping Size:
1100 Denier Reinforced PVC
Floor Shipping Weight:
128 lbs
Quadruple Overlap
Air Valves:
Recessed One-Way
Speed (approx.):
30 mph (40HP w/2 adults)
Inflation & Assembly:
45 min.

Note: Specifications and accessories are subject to change without notice. Max O/B Motor means: maximum power of outboard motor that can be safely used to plane the boat loaded to the maximum capacity at normal water surface conditions. Please exercise common sense and caution when using maximum motor capacity. Do not jump from wave to wave as new 4-stroke motors are much heavier then 2-stroke and provide extra strain on the transom. Under normal circumstances, with half the maximum persons/load capacity, 50% of maximum O/B power rating may be necessary to put boat on plane.

I wanted a big boat that wouldn't break the bank. I purchased the SD518 to take my friends out in the water. We are usually four, so we have a lot of room to spare for supplies. Since this is such a large boat I keep it under a boat cover to protect form the sun. Overall it's a good boat that has not given me any problems.

I’m a scuba diving instructor who owns my own business. I do pretty decent, as I’ve been in the business for a long time and get lots of referrals. I really love owning the company, but I’m a small business, so I need to keep expenses to a minimum. As you could probably guess, the boat I take people out on is really my biggest expense. We all know how expensive upkeep on boats can be, but for me, I can’t just get rid of mine. I need it for my work.

Long story short, a scuba buddy of mine told me I should consider an inflatable boat from you guys. I checked out your site, and ended up taking the plunge and buying the SD518. At 18 feet long and pretty wide, this thing can handle all the gear for me and my students. It’s light, so it saves on fuel, which is another one of my main expenses. It’s also very tough. At first, I was scared I’d pop it, so I would be very careful setting down my equipment inside it. Now, I just toss the gear in like I would on my old boat. Honestly, I can’t really even think of anything I can’t do with this boat that I could do with my old boat.

More colors would be great please!! The boat is huge, so if you plan to take it around with you , buy a trailer! I was able to add seats and rod holders to make this boat even better. occasionally I need to fold it up and it fits in my truck!

The Saturn SD518 is a beast! This 18 foot inflatable monster is really incredible. My buddy and I split the cost, and now we take our two families out on this thing together almost every weekend. Our kids are friends, and our wives are close, so it gives everyone an excuse to get together. Plus, my buddy and I don’t mind the fishing we get to do.\r\n\r\nThis rubber boat is so big, we can fit both our families, all our fishing gear, and plenty of food and drink. Even some adult beverages! It all fits right in the bed of my truck, so it’s easy to get to and from the water. And between the two of us, carrying it down to the shore isn’t any problem at all. Next I think I’m get a smaller inflatable boat from you guys for those times when I can get a day by myself. Not that that happens too often nowadays.\r\n\r\n\r\n

The Saturn SD518 inflatable boat you guys sell is really worth the price. I paid like $1,700 for it including shipping. Once I used it a few times, I knew it could meet all my needs, so I sold my old Mako Sportsfisherman for like $8k. I also save a ton monthly on storage and cleaning because my Saturn fits right in my garage without taking up any space.

I owned boats my whole life, and I never even really thought about buying an inflatable boat. My neighbor had one, and I was laughing about it. He took me out fishing on it one day, and it blew my mind. The experience is basically the same as a hard-hull boat if you just want to go out cruising or fishing. It’s comfortable, handles well, and is so easy to store and clean.

16 feet is plenty long for me and my whole family. I use the aluminum floor it came with, and the thing is sturdy. But it’s also very light, so the little outboard I stuck on it gives it plenty of juice, even with my whole 5 person family riding in it.

When I got my boat, one of the floor boards was cracked due to The carrier throwing the box around. Boatstogo was able to send me a new floor without any issues. Once I was able to put everything together I was able to enjoy this boat. Its big, and has a lot of room. I just put on a 25HP and its enough for me. Great boat, better customer service.
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