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RAM® Tough-Ball™ with 1/4"-20 x .50" Threaded Stud - B Size
Part #: RAP-B-379U-252050 UPC: 793442938153

Product Information
Overview	The RAP-B-379U-252050 consists of a 1" diameter rubber ball, connected to a 1/4"-20 X .50" male threaded post. The male thread matches most standard camera and camcorder female threads found on the bottom of the camera.

Specifications
thread pitch	1/4"-20 x .5"
ball size	B Size (1")
weight capacity	Standard Use: 2 lbs Heavy-Duty Use: 1 lb
materials	High strength composite Stainless steel
packaging type	Poly Bag
Weight	0.08 lb

RAM® Tough-Ball™ with 1/4"-20 x .50" Threaded Stud - B Size

Name: RAM® Tough-Ball™ with 1/4"-20 x .50" Threaded Stud - B Size
Brand: RAM Mounts
SKU: RAP-B-379U-252050
Price: 11.49 USD
Availability: InStock

Part#: RAP-B-379U-252050

UPC: 793442938153

$11.49

Options

RAM® Double Socket Arm - B Size Short

$18.49

Overview

The RAP-B-379U-252050 consists of a 1" diameter rubber ball, connected to a 1/4"-20 X .50" male threaded post. The male thread matches most standard camera and camcorder female threads found on the bottom of the camera.

thread pitch:

1/4"-20 x .5"

ball size:

B Size (1")

weight capacity:

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

materials:

High strength composite
Stainless steel

packaging type:

Poly Bag

Weight:

0.08 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 are the dimensions (size if nut in mm or inches) of the built-in hex nut under the ball?

The hex nut portion of the RAP-B-379U-252050 is .63" from flat side to flat side, .69" from point to point, and each side has a length of .36".

RAM® Tough-Ball™ with 1/4"-20 x .50" Threaded Stud - B Size

$11.49

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.