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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Avid Reader
West Palm Beach, US
★★★★★ 5
Cute, warmth and quality!
Size: Small-X-Large, Color: Undyed Beige, Size: Small-X-Large, Color: Undyed Beige
Comfortable, cute and kept me warm, but not too hot. The cashmere felt great, extremely soft, and it didn’t mess up my hair like a synthetic hat can. We were out in subzero weather, and this baby did its job!
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Reviewed in the United States on March 1, 2026
A
Verified Purchase
A. M.
Chelsea, US
★★★★★ 5
Perfect fit for a small woman or teenager
Size: Small-X-Large, Color: Light Gray
I think this beanie is a great price for the quality. It’s about as soft as wool can possibly be. I was very impressed by the packaging. It made me feel like I was opening a luxury item, which is nice because it was reasonably priced. They even included a bit of extra yarn in case it needs repairs someday. It does fit a bit snug. I have a small head, so it might be uncomfortable for someone with a bigger head. I definitely would NOT buy this for a man. It’s comfortable for a small female only, or a teenager. Overall, I think it’s a good hat for the price.
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Reviewed in the United States on January 24, 2026
X
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Xöel
Fort Morgan, US
★★★★★ 5
off-BLACK BEANie
Size: Small-X-Large, Color: Black & White Gray
A bit thin, but soft, warm and good looking in an off-black color.
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Reviewed in the United States on December 21, 2025
S
Verified Purchase
Sergio Merdani
Carnegie, US
★★★★★ 5
Winter hat
Size: Small-X-Large, Color: Black & White Gray
Super warm and comfortable. Highly recommended
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Reviewed in the United States on January 26, 2026
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Colleen
San Leandro, US
★★★★★ 4
Basic cashmere at a good price.
Size: Small-X-Large, Color: Black
It wasn’t as soft as I was hoping but it’s comfortable and for the price point a good value.
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Reviewed in the United States on January 10, 2023

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