RAM Mount 1" Ball Mount Kit – Round Base, Double Socket Arm & Diamond Adapter (RAM-B-138U)
Free returns on all eligible orders
You have 30 days to request a return. All sale items are final sale.
RAM Mount 1" Ball Mount Kit – Round Base, Double Socket Arm & Diamond Adapter (RAM-B-138U)
Everything you need to mount a device in one box. This complete RAM Mount kit pairs a 2.5" round base with a 1" double socket arm and a diamond base adapter, giving you a ready-to-install mounting solution for GPS chartplotters, VHF radios, phones, and other electronics on flat surfaces like helm consoles, dashboards, and bulkheads.
The 1" rubber ball-and-socket system at both ends of the arm provides near-infinite adjustment — tilt, swivel, and rotate to your ideal viewing angle, then lock it down. RAM’s patented rubber ball design also absorbs shock and vibration, protecting your device from the punishment of rough water.
What’s Included
- 2.5" diameter round base with universal AMPS hole pattern
- Standard double socket arm (1" ball, both ends)
- Diamond base adapter — connects to most RAM device cradles
- Part Number: RAM-B-138U
Key Specs
- Ball size: 1" diameter rubber ball
- Base diameter: 2.5"
- Base hole pattern: Universal AMPS
- Adapter: Diamond base — compatible with most RAM 1" cradles and holders
- Adjustment: Near-infinite pivot and rotation at both ball joints
Parts Desk Insights
Best suited for flat-surface installations on helm consoles, dash panels, and bulkheads where you want a complete, matched kit without sourcing components separately. The universal AMPS hole pattern on the round base means it will also accept a wide range of third-party device holders. If you’re mounting to a rail instead of a flat surface, pair the RAM Mount 1" Ball Rail Base with the RAM Mount Standard Double Socket Arm for 1" Balls instead. For a shorter arm with less reach, the RAM Short Double Socket Arm for 1" Balls can be substituted. The 1" ball system is best matched to lighter devices — handheld GPS units, phones, and compact VHF radios.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 3–4 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
Returns & Satisfaction Guarantee
We stand firmly behind the quality of every product we sell. Your confidence matters to us — and we back it with a straightforward 30-Day Satisfaction Guarantee.
If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
To qualify for a return:
Item must be in new, unused condition
Product must be in its original packaging
All parts, components, hardware, manuals, and accessories must be included
Packaging must be undamaged and suitable for resale
Important:
Electronics are strictly inspected. No returns on open-box electronics. Exceptions may apply only with prior written approval. Any electronic unit that has been installed, powered, activated, or altered may not be eligible for return.
We are serious about product integrity — and equally serious about taking care of our customers. If there is ever a product issue, contact us immediately so we can make it right.
For return authorization, please contact our support team before shipping anything back.