Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 15 - Jul 20
For Your Every Summer RSVP, with Code: SUMMER15
Description
R & D Flexible Shaft Coupling f/5" B/W, Hurth - 8HP/100RPM CapacityFlexible Shaft Coupling for 5" B W, Hurth 8HP 100RPM Capacity The R&D Flexible Couplings are fabricated from a contoured flexible disc molded in tough yet resilient new type polyurethane. The contoured disc gives clearance for the bolt heads, and is able to flex freely to take up any temporary misalignment of the engine and shaft, due to flexing of the boat structure or the engine moving on its rubber vibration isolation mountings. Forward thrust is
Flexible Shaft Coupling for 5" B/W, Hurth - 8HP/100RPM CapacityThe R&D Flexible Couplings are fabricated from a contoured flexible disc molded in tough yet resilient new type polyurethane. The contoured disc gives clearance for the bolt heads, and is able to flex freely to take up any temporary misalignment of the engine and shaft, due to flexing of the boat structure or the engine moving on its rubber vibration isolation mountings. Forward thrust is taken in compression on the disc between the two half couplings and reverse thrust is taken again in compression on the disc between the two fail straps. In the unlikely event of a disc failure the steel straps make the coupling fail safe and ensure drive is maintained in both forward and reverse.
To calculate power of coupling required:
Horse Power of Engine x Reduction Ratio x 100 = HP/100RPM
Engine Speed
Example:
Ford 150 HP at 2500 RPM with Borg Warner Velvet Drive 72C 2:1 Reduction Ratio
Engine Horse Power is 150 HP, Max Rated RPM is 2500, Reduction Ratio is 2:1
150/2500 X 2 x 100 = 12hp per 100RPM
Coupling required is 910-009
The R & D Marine Flexible Coupling fits between the transmission output flange and shaft coupling. It is designed to protect a boat's drivetrain. The unit will reduce vibration, compensate for some misalignment, isolate the shaft and absorb shock loads.
The flexible disc is machined from a resilient and durable polyurethane. It allows the unit to flex, absorbing vibrations and temporary misalignment of the shaft and engine due to movement of the engine or flexing in the =vessel's structure.
The polyurethane disc is backed up by two metal compression straps, one on either side of the flexible coupling. These metal straps hold the system in constant compression whether the drivetrain is in forward or reverse. This feature extends the life of the system dramatically.
The R & D Marine Flexible Coupling will also absorb shockloads resulting from gear changes, or the propeller striking a submerged object. The polyurethane disk will distort with light shock loads and is designed to be sacrificial in the event of severe shock load, saving on expensive drivetrain repairs. If the disc is destroyed from massive shockload the metal compression straps keep the coupling intact ensuring that the drive system is functional in both forward and reverse.
Why R&D Marine Flexible Shaft Couplings?
- Polyurethane flange creates a flexible barrier to reduce drivetrain noise and vibration to quiet your drivetrain
- Absorbs transmission shock load caused by the propeller and high speed gear changes. This helps to reduce and avoid costly transmission damage
- Fail safe design, both forward and reverse thrust is taken in compression from the steel straps, giving a durable design even in extreme conditions
Manufacturer : R & D Marine
Manufacturer Part No : 910-044
UPC : 839662004114
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.7 ★★★★★
Based on 720 reviews
Sort
Product Reviews
★★★★★ 5
From travel chaos to an efficient and methodical process
Color: Haze Blue+Dusty Blue, Size: Large
This organizer was meticulously developed for holding passports, IDs, credit cards, money, tickets, ink pen, car key, and etc. in a compact, convenient, and orderly manner. I also placed Lysol wipes in the exterior front pocket and zipped my cell phone into the exterior back pocket. It is easy to open and retrieve the items needed for every step of my travels. No more digging for travel essentials in a variety of zipped pockets. Travel chaos is now an efficient and methodical process.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 19, 2026
★★★★★ 5
Exelente.
Color: Gunmetal Grey, Size: Large
Exelente producto estoy muy conforme.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 5, 2026
★★★★★ 4
Light, organized, security concern about strap
Color: Black+Gunmetal Grey, Size: Large, Color: Black+Gunmetal Grey, Size: Large
I used this passport holder on a recent multi passport trip and overall it does what it claims without feeling bulky. The nylon material is lightweight but reasonably sturdy and holds its shape well in a backpack or day bag. It does not feel flimsy, and still looks new with the stitching and zippers holding up well
Organization is the strong point. On one side I was able to fit three passports comfortably, though the pockets are not a uniform depth. The pockets are loose enough you can also double up if needed. A fourth passport fits on the opposite side along with several credit cards. There are zippered pouches inside and outside useful for cash and a phone, plus open access pockets that work well for boarding passes or documents you need to grab quickly. There is also a small storage area above the credit card slots that turned out to be useful, though listed for SSD storage, I stored a couple of CR2032 batteries there for Bluetooth trackers.
The RFID blocking is a basic but expected feature and worked as intended. Nothing about the layout forces cards or passports to bend, which I appreciate since I tend to keep this packed while moving through airports.
The shoulder strap is my main criticism. It is thin and functional but could be cut fairly easily. I would prefer to see embedded wire or a more reinforced strap for better security in crowded areas. The handle is fine for short carries, but the strap is what you rely on most of the time.
The included Bluetooth tracker works well enough for proximity alerts, but it is not compatible with Apple Find My. I ended up removing it and using an AirTag instead, which fit without issue and gave better ecosystem integration for me.
Overall, this is a practical, lightweight travel organizer that handles multiple passports and documents well. The layout is thoughtful and flexible, and the build quality matches the price point. The strap and tracker limitations are worth noting, but the core function as a family passport holder is solid.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 11, 2026
★★★★★ 3
Nice for travel
Color: Black, Size: Large
No fashion statement here but useable for my trip.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
★★★★★ 5
Bere
Color: Gunmetal Grey, Size: Large
Tiene buena capacidad, es ligero y cómodo ideal para cuando sales de viaje puedes guardar lo esencial
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 21, 2026