RAM MOUNTS B Size 1" AMPS Plate Mount Ball Adapter (RAM-B-347U)
Quick take
The RAM-B-347U is a B-size RAM ball base that lets you attach a compatible RAM double-socket arm to an AMPS-standard plate mount (1.5 x 1.188 inch hole spacing). It is built from powder-coated, marine-grade aluminum for vehicle use, and it is made for near-infinite positioning thanks to the RAM ball-and-socket system. The key buying caveat is that mounting hardware is not included, so you may need to purchase bolts and nuts separately.
Pros and cons
Pros
- Uses industry-standard AMPS plate mounting with four corner holes (1.5 x 1.188 inch spacing)
- Connects to B-size 1-inch RAM rubber ball systems for highly adjustable positioning
- Powder-coated, marine-grade aluminum base designed for demanding environments
- Broad compatibility with multiple Garmin zumo and other vehicle GPS models listed by the manufacturer
Cons
- Does not include mounting hardware, so you may need to source bolts and nuts
- Works only if your setup uses the correct RAM ball size and matching arms
What buyers think
Buyer-review evidence is limited in depth, but the recurring themes are consistent. People generally report that the adapter fit well for their intended Garmin Zumo setups and that it performs as expected once installed. Several comments emphasize the overall quality of the RAM mounting ecosystem when used as a system with the correct arm and phone or GPS holder. A small number of reviews highlight a practical omission: the base works well, but hardware to fasten it to a surface is not included, so buyers need to plan for that.
What this adapter is for
This is a surface-mount “base” that provides a stable AMPS plate connection plus a RAM ball connection point. In practice, it is the foundation you use when you want to mount a compatible GPS or other device in a way that is adjustable in multiple directions (rather than fixed angle).
Key specs and compatibility to verify
AMPS plate hole pattern
The base features a 2" x 1.7" square footprint with four pre-drilled holes at the corners. The hole spacing matches an AMPS-standard pattern of 1.5 x 1.188 inches, which is the most important measurement to confirm before buying if you are reusing an existing AMPS mount, customizing a dash plate, or replacing an older base.
RAM ball size and adjustability
The unit includes a 1" RAM rubber ball. That ball size matters because it determines which RAM arms it can connect to. With RAM ball-and-socket technology, you get the adjustability that allows the connected arm and holder to be positioned for better viewing and access.
Material and environment
The aluminum base is powder-coated and described as marine-grade, which is a good sign for vehicle mounts that see vibration, weather exposure, and long-term use.
Device compatibility examples
The listed compatibility includes multiple Garmin zumo models (including zumo 390LM, 396 LMT-S, 450, 500, 595LM, 660, 665, and zumo XT) plus the Magellan TRX7 CS and Road Tech Zumo / TomTom Rider models named in the product listing. If you are matching a specific cradle or arm you already own, double-check that it is built around the RAM B-size, 1-inch ball system.
Pros and cons in real-world terms
Best for
- Riders who want a dash or plate-mounted GPS setup with adjustable positioning
- Anyone using RAM double-socket arms that connect to a B-size 1-inch ball
- Projects where you prefer AMPS-standard spacing for mounting flexibility
Who should avoid it
- If you need the entire mounting kit with fasteners included, plan on buying hardware separately
- If your existing arm or cradle does not match the 1-inch RAM ball and B-size ecosystem
Installation considerations (what to plan for)
Before you install, confirm your mounting surface is compatible with the AMPS hole spacing and that you have the right fasteners. One recurring buyer note is that the adapter base alone may not include bolts and nuts, so have your hardware ready to avoid delays. Also, think about arm geometry, cable routing, and how you want the screen or holder angled after final tightening.
Is it worth it?
The RAM-B-347U is a solid choice if you are building or upgrading a RAM-based vehicle mount system and you specifically want an AMPS plate base plus a B-size 1-inch ball connection. It makes sense for buyers who value adjustability and a durable aluminum base. If you are working with limited space, non-standard hole patterns, or you expected hardware to be included, you may want to factor in the additional fasteners and compatibility checks before purchasing.
FAQs
Does the RAM-B-347U include mounting hardware?
No. Some buyers note that mounting hardware such as bolts and nuts is not included, so you should plan to source the appropriate fasteners for your surface.
What AMPS hole spacing does this ball adapter use?
It uses an AMPS-standard hole spacing of 1.5 x 1.188 inches, with four pre-drilled corner holes on a 2" x 1.7" base.
What size RAM ball is it?
It uses a 1-inch RAM rubber ball and is designed for the RAM B-size ecosystem of compatible arms and holders.
Which GPS models does it work with?
It is listed as compatible with several Garmin zumo models and other named devices such as Magellan TRX7 CS and specific Road Tech and TomTom models, but you should still confirm your exact cradle or arm uses the correct RAM B-size, 1-inch ball interface.
What kind of adjustability should I expect?
Because it uses RAM ball-and-socket technology, you can position the connected arm and holder in multiple directions for viewing and access.
Specifications
| Product Title | RAM MOUNTS B Size 1" AMPS Plate Mount Ball Adapter (RAM-B-347U) |
|---|---|
| Category | Electronics > GPS, Finders & Accessories > GPS System Accessories > Vehicle Mounts |
| Brand | RAM MOUNTS |
| Manufacturer | RAM MOUNT |
| Model Name | FBA_RAM-B-347U |
| Model Number | RAM-B-347U |
| Color | Black |
| Item Weight | 1.6 ounces |
| Compatible Devices | Garmin dezl OTR1000, GPSMAP 276Cx, zumo 390LM, 396 LMT-S, 400, 450, 500, 550, 590, 595LM, 660, 665, XT, Magellan TRX7, TRX7 CS, Road Tech Zumo TomTom Rider 2, Urban |
| Compatible Phone Models | Garmin dezl OTR1000, GPSMAP 276Cx, zumo 390LM, zumo 396 LMT-S, zumo 400, zumo 450, zumo 500, zumo 550, zumo 590, zumo 595LM, zumo 660, zumo 665, zumo XT, Magellan TRX7, TRX7 CS, Road Tech Zumo 590, Tech Zumo 660, Tech Zumo 665, TomTom Rider 2, Urban Rider, Trail Tech Voyager Pro |
| Mounting Type | Vehichle Mount |
| Additional Features | Plate Size: 2" X 1.7", Thread Pitch: 1/4"-20 |
| Weight Capacity Maximum | 1 Pounds |
| Water Resistance Level | Water Resistant |
| Compatible with Vehicle Type | Motorcycle |
| Item Dimensions | 2 x 2 x 2 inches |
| Arm Length | 2 Inches |
| Shape | Square |
| UPC | 066511446010 680003582255 078433485565 793442907623 097914411718 |
| Global Trade Identification Number | 00793442907623 |
| Mfr Part Number | FBA_RAM-B-347U |
| Warranty Description | See RAM Mounts manufacturer warranty for details |
| Enclosure Material | Aluminum |
Available variants
Product Packaging
- Standard Packaging
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