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

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