RAM® Triple Ball Adapter - B Size

Part #: RAM-B-289U
UPC: 793442102899
Ball Size: B
Price: $50.99

Specifications

ball size	B Size (1")
weight capacity	Standard Use: 2 lbs Heavy-Duty Use: 1 lb
materials	Marine-grade aluminum
packaging type	Poly Bag
Weight	0.2 lb

RAM® Triple Ball Adapter - B Size

Part#: RAM-B-289U

UPC: 793442102899

$50.99

Every RAM® mount is built around a rubber ball and socket system. The ball size sets how much weight the mount can carry. Match it to your device for smooth adjustment with a rock-solid hold.

RAM Mounts ball size specifications and typical uses
Size	Ball Diameter	Max Load*	Best For
A	0.56" (14.3 mm)	0.5 lb	Action cameras and other ultra-light devices
B — this product	1" (25.4 mm)	2 lbs	Phones, GPS units, and small tablets — the most common size
C	1.5" (38.1 mm)	4 lbs	Large tablets, fish finders, and rougher rides
D	2.25" (57.2 mm)	6 lbs	Rugged tablets, laptops, and heavy equipment
E	3.38" (85.9 mm)	15 lbs	Large displays and demanding aviation or industrial use

*Approximate capacity for a standard ball with a mid-length arm. Shorter arms and steel-reinforced posts increase real-world capacity.

Reading part numbers

The letter after RAM tells you the ball size: RAM-B-166 uses a 1" B ball, while RAM-D-201 uses a 2.25" D ball. C size parts are the exception and carry no letter, so RAM-201U is a C size arm.

ball size:

B Size (1")

weight capacity:

Standard Use: 2 lbs
Heavy-Duty Use: 1 lb

materials:

Marine-grade aluminum

packaging type:

Poly Bag

Weight:

0.2 lb

Return Policy:

All products purchased from RAM® can be returned within 30 days with no restocking fee (return shipping not provided). See full return policy here.

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Documents

Knowledge Base: Ball Sizes

QUESTIONS & ANSWERS

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What is the diameter of the hole in the RAM-B-289U?

The inside diameter of the center hole is .48" and the outter diameter is .95".
What size is the hole and how deep? Is it or can it be threaded?

The center barrel portion of the RAM-B-289U is 1.18" tall and does not come threaded.
Will this work on top of the Tele-Pole?

The RAM-B-289U is not compatible with the swing arm at the end of the tele pole, but the RAM-289U that has 1.5" diameter balls, which would work with the tele pole & swing arm assembly.