SKU: 98959106156

RAM Double Ball Mount with Round & Diamond Bases - B Series - Short Arm

Sale price$66.15 Regular price$73.50
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Description

RAM Double Ball Mount with Round & Diamond Bases - B Series - Short ArmRAM B 138U A RAM Double Ball Mount with Round & Diamond Bases B Size Short The RAM B 138U A is a drill down mounting solution pairing a round AMPS base and a diamond AMPS base on a short B Series double socket arm, giving a compact, near infinitely adjustable mount with two mounting hole options. Key Features Round base with the universal AMPS hole pattern for surface mounting; diamond base with the 2 hole AMPS pattern for lighter device holders

RAM-B-138U-A RAM® Double Ball Mount with Round & Diamond Bases – B Size Short

The RAM-B-138U-A is a drill-down mounting solution pairing a round AMPS base and a diamond AMPS base on a short B Series double socket arm, giving a compact, near-infinitely adjustable mount with two mounting-hole options.

Key Features

  • Round base with the universal AMPS hole pattern for surface mounting; diamond base with the 2-hole AMPS pattern for lighter device holders
  • Includes one round ball base, one diamond ball base, and a short B Size double socket arm for a low-profile fit
  • Ball-and-socket technology allows near-infinite adjustability and dampens shock and vibration
  • Powder-coated, marine-grade aluminium construction
  • Backed by RAM Mounts' lifetime warranty

Works With

The round base bolts down using the 4-hole or 3-hole AMPS pattern, while the diamond base connects to RAM® and many third-party cradles with the 2-hole AMPS pattern. The 1" B Size balls suit any RAM® holder built for a B Size ball.

Dimensions & Specifications

  • Overall height: 78.5mm (3.09")
  • Arm length: 60.5mm (2.38") overall, 51mm (2") socket-to-socket
  • Diamond base: 61.7 x 33.3mm (2.43 x 1.31"), 2-hole AMPS 48.6mm (1.912") centre-to-centre
  • Round base: 63.5mm (2.5") diameter; 4-hole AMPS 30 x 38mm, 3-hole AMPS 120° 46.0mm
  • Ball size: 1" rubber ball, B Size
  • Material: powder-coated marine-grade aluminium
  • Weight: 181g (0.4 lbs)
  • Load rating: 907g (2 lbs) standard use, 454g (1 lb) heavy-duty use

What's Included

  • RAM-B-202U round base with 1" ball
  • RAM-B-238U diamond base with 1" ball
  • RAM-B-201U-A short double socket arm for B Size 1" balls

FAQs

Q: What size screws do the base plates take?
A: The AMPS patterns most commonly take #8, #10, M4, or M5 screws. If you're pairing this with a RAM® holder, the holder comes with its own hardware; surface-mount hardware for your own application isn't included.

Installation Video

Watch on YouTube

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. 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
SKU: 98959106156

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Derek Preston
Grantham, US
★★★★★ 5
Great buy
Size: 11, Color: Tan
Great fit comfortable look good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 12, 2026
M
Verified Purchase
mike t.
Houston, US
★★★★★ 5
Great shoes
Size: 14 Wide, Color: Black
My shoes look good and feel good and now I’m going to purchase the brown pair I saw
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Reviewed in the United States on April 24, 2026
N
Verified Purchase
Nicholas D. Clark
Houston, US
★★★★★ 4
Don’t buy for restaurant industry
Size: 10.5, Color: Black, Size: 10.5, Color: Black
Good looking shoes, fairly comfortable and good value based on the description shared, so I don’t feel it’s fair to rate them lower than 4 stars. I had high hopes for them based on previous reviews from others saying they wore them in the food and beverage industry that mentioned their quality and durability, however I strongly recommend looking elsewhere if you do. I purchased these to wear working in a full service upscale restaurant and in less than two months have managed to have torn the material on the middle exterior section and the bottoms of the shoes are already completely worn down. Good design, but the durability needs to be improved if they’re to hold up for that industry.
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Reviewed in the United States on July 18, 2025
D
Verified Purchase
Damon Richards
Lake Worth, US
★★★★★ 1
DO NOT BUY (lasted less than 7 months)
Size: 11, Color: Black, Size: 11, Color: Black
I bought these for work as a bartender in August of 2025. By December, the tops were scuffed, frayed, and peeling beyond repair, and by February, the soles were coming off. I’ve never had a pair of shoes with such low quality.
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Reviewed in the United States on April 11, 2026
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Verified Purchase
Daniel Lucarell
Fort Morgan, US
★★★★★ 5
Most comfortable shoes, right out of the box!
Size: 8.5, Color: Cognac Napa Leather
Oh my! So, my ordering of shoes online has been hit or miss - 1/2 size too big or too small; too wide or not wide enough. Enter these Marc Joseph shoes… such a game changer. They fit like a glove, exceptionally comfortable, and easy to slip in and out of. I like them so much that I am shopping for another pair. So far, the size, quality, fit, feel, look, and comfort make this pair my dedicated first pick. Btw, I have been wearing them for six hours and they are still very comfortable! I highly recommend these shoes.
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Reviewed in the United States on September 28, 2025

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