RAM® Curved Extension Base with Ball

Part#: RAM-B-125BU
UPC: 793442921711
$18.49

Overview

The RAM-B-125BU, curved extension base includes a 1" rubber ball, allowing for near-infinite adjustment and perfect viewing angles. Originally designed to position your GPS in front of the yoke on your plane, the extension plate can also be used in many other applications. The mounting section of the plate is a 2.5" square with pre-drilled holes for many different screw hole patterns, including the universal AMPS hole pattern. The connection section extends approximately 2.25" forward, at a 45 degree angle, from the center of the 1" ball and approximately 1.5'' above the 1" ball (to the bottom of the connection section of the plate).

hole pattern:

Various AMPS Hole Patterns

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:

0.26 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.

QUESTIONS & ANSWERS

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  • What size screws are needed for the holes on this ball plate?

    The most common screw sizes are #8, #10, M4 and M5 screws. However, if you are pairing this with any RAM® Holder, the holder will come with the necessary hardware to connect to your mount.

  • Can the ball be removed and mounted opposite of where the picture shows?

    No, the ball is formed around a metal post that cannot be moved.

  • Is there a drawing for this? Looking for something that has holes 2" apart on center.

    RAM offers the RAM-B-202U-2525 which has a square hole pattern 2" x 2".

RAM® Curved Extension Base with Ball
$18.49

Size Guide

Ball sizes
  • A Size 0.56" ball
  • B Size — this product 1" ball
  • C Size 1.5" ball
  • D Size 2.25" ball
  • E Size 3.38" ball

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
A0.56" (14.3 mm)0.5 lbAction cameras and other ultra-light devices
B — this product1" (25.4 mm)2 lbsPhones, GPS units, and small tablets — the most common size
C1.5" (38.1 mm)4 lbsLarge tablets, fish finders, and rougher rides
D2.25" (57.2 mm)6 lbsRugged tablets, laptops, and heavy equipment
E3.38" (85.9 mm)15 lbsLarge 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.

Add-on & Accessories

B Size Double Socket Arms
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