RAM MOUNTS Diamond Ball Base with 2-Hole AMPS Pattern, B Size 1" Ball Mount (RAM-B-238U)
Quick take
The RAM-B-238U is a RAM Mounts diamond ball base that gives you a 1-inch B-size ball connection plus a 2-hole AMPS mounting pattern for attaching to your vehicle or equipment setup. It is built from powder-coated, marine-grade aluminum and is intended for flexible positioning through RAM’s ball-and-socket system. The biggest buying caveat is compatibility: you need the right RAM cradle/device holder and matching AMPS spacing for your intended install.
Pros and cons
Pros
- AMPS-compatible diamond plate base (2-hole AMPS pattern) for mounting to AMPS-standard equipment
- 1" B-size ball connects to RAM’s ball-and-socket system for wide adjustability
- Powder-coated, marine-grade aluminum construction aimed at demanding environments
- Clear mounting dimensions and center-to-center hole spacing for easier planning
Cons
- It is a base only, so you must pair it with a compatible RAM holder/cradle for your device
- Installation requires drilling-down into your surface, so it may not suit buyers seeking tool-free mounting
- Compatibility depends on your AMPS pattern spacing and RAM B-size ball system
What buyers think
Buyer feedback themes are strongly positive around build quality, fitment, and ease of installation. Many comments describe the mount as solid and well made, and they often mention successful long-term use in real-world conditions such as motorcycles and boats. A recurring point is that the ball-and-socket connection works as expected for holding a device securely, and buyers also tend to value the overall value-to-quality balance. Some feedback also highlights RAM’s warranty support when components fail after extended exposure, suggesting buyers see practical backup behind the hardware, even though time-in-use and conditions can vary.
Who this is for
This diamond ball base is a good match if you already use, or plan to use, RAM’s 1-inch B-size ball-and-socket ecosystem. It is also a practical choice if your priority is a sturdy, aluminum base with an AMPS-standard hole pattern so you can mount it to a dash, deck, console, or other flat surface where you can drill and secure it.
Key specs that affect compatibility
- Ball size: 1" B size rubber ball (RAM B-size system connection)
- Mounting plate: diamond plate measuring 2.43" x 1.31"
- AMPS hole pattern: 2-hole AMPS, with 1.912" center-to-center hole spacing
- Mounting type: drill-down
- Materials and finish: powder-coated, marine-grade aluminum
- Weight capacity: standard use 2 lbs, heavy-duty use 1 lb
Pros and cons in real buying terms
Why shoppers choose it
Because it is a base, it offers flexibility without locking you into a single device cradle. Once installed, the ball-and-socket architecture makes it easier to reposition your connected mount (like a phone or other RAM-compatible device holder) for different viewing angles. The aluminum construction and powder coat are also aligned with vehicle and outdoor exposure, which is reflected in buyer comments about durability over time.
Where buyers can get tripped up
The most common reason something like this feels “wrong” is that it is not the full mounting system. You still need a compatible RAM device holder, cradle, or arm that matches the 1" B-size ball and the way you want to route the mount. Also, drilling-down is required, so if your installation plan depends on non-permanent mounting, you will likely want a different approach.
Installation planning checklist
- Confirm your surface can be drilled and that you have clearance for the diamond plate footprint (2.43" x 1.31").
- Measure the AMPS hole spacing you have available. The center-to-center distance on this base is 1.912".
- Choose a compatible RAM B-size device holder/cradle (phone mount, gear mount, or your existing RAM accessory).
- Consider load. For heavier devices, the heavy-duty rating (1 lb) is the safer planning number.
Price and availability
This item is typically sold as an individual RAM base component, and pricing can vary by retailer. If you are comparing options, focus less on the total kit price and more on whether your planned device holder is already compatible with RAM’s B-size ball system.
Verdict
The RAM-B-238U is a straightforward, durable diamond ball base for anyone building a RAM ball-and-socket mount setup around an AMPS-standard plate pattern. It is best for buyers who want a flexible, adjustable mounting platform, and who are comfortable with drill-down installation. If you need a complete mount kit with a specific cradle included, make sure you budget for (or already own) the compatible RAM holder that pairs with this B-size ball.
FAQ
Does this include a RAM device holder or cradle?
No. This is the diamond ball base, so you will need a compatible RAM device holder/cradle or arm that connects to the 1" B-size ball.
What does “2-hole AMPS” mean on this base?
It refers to the diamond plate having an AMPS-standard mounting pattern with two holes. The hole spacing is 1.912" center-to-center, and the plate measures 2.43" x 1.31".
Is it compatible with the RAM B-size (1-inch ball) system?
Yes. The base uses a 1" B-size ball, which is part of RAM’s ball-and-socket system for compatible cradles and arms.
How much weight can it hold?
The stated capacity is 2 lbs for standard use and 1 lb for heavy-duty use, so heavier setups should be planned within the heavy-duty number.
What type of installation does it use?
It is a drill-down mounting style, meaning you will secure the base to your surface using the plate’s hole pattern.
Is this meant for outdoor or marine environments?
It is made from powder-coated, marine-grade aluminum, which is intended to hold up in demanding environments, including outdoor exposure.
Specifications
| Product Title | RAM MOUNTS Diamond Ball Base with 2-Hole AMPS Pattern, B Size 1" Ball Mount for RAM Device Holders and Mounting Systems RAM-B-238U |
|---|---|
| Category | Electronics > GPS, Finders & Accessories > GPS System Accessories > Vehicle Mounts |
| Brand | RAM MOUNTS |
| Manufacturer | RAM MOUNTS |
| Model Number | RAM-B-238U |
| Color | Black |
| Material | Aluminum |
| Item Weight | 22.68 g |
| Brand Name | RAM MOUNTS |
| UPC | 826950875778 012302050508 033111136214 888063686467 793442102387 824365003052 509961552547 |
| Global Trade Identification Number | 00793442102387, 07934421023870 |
| Manufacturer Part Number | FBA_RAM-B-238U |
| Manufacturer Warranty Description | See RAM Mounts manufacturer warranty for details |
| Item Dimensions | 2 x 1.5 x 2.5 inches |
| Item Depth | 2.5 inches |
| Material Type | Aluminum |
| Mounting Type | Drill-Down |
| Finish Types | Powder Coated |
| Item dimensions L x W x H | 2 x 1.5 x 2.5 inches |
Available variants
Style
- Marine-grade Aluminum
- High-strength Composite
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