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RAM® Double Socket Arm without Knob - Acorn Nut - B Size Medium
Part #: RAM-B-201NKU UPC: 793442941092

Product Information
Overview	The RAM-B-201NKU is our medium length B-size double socket arm with an acorn nut instead of a hand tightening knob.This would be a good choice for someone who does not have room for a traditional hand tightenning knob or if you want a tool to be required to adjust the arm.

Specifications
product dimensions	Overall Length: 3.73"
socket to socket length	3"
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	0.3 lb

RAM® Double Socket Arm without Knob - Acorn Nut - B Size Medium

Name: RAM® Double Socket Arm without Knob - Acorn Nut - B Size Medium
Brand: RAM Mounts
SKU: RAM-B-201NKU
Price: 19.99 USD
Availability: InStock

Part#: RAM-B-201NKU

UPC: 793442941092

$19.99

Overview

The RAM-B-201NKU is our medium length B-size double socket arm with an acorn nut instead of a hand tightening knob.This would be a good choice for someone who does not have room for a traditional hand tightenning knob or if you want a tool to be required to adjust the arm.

product dimensions:

Overall Length: 3.73"

socket to socket length:

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:

0.3 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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Knowledge Base: Socket Arms

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RAM® Double Socket Arm without Knob - Acorn Nut - B Size Medium

$19.99

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.

Short, medium, and long double socket arms compared side by side. This product uses a Medium arm — Arm lengths

The double socket arm clamps over two balls — one on the base and one on your device holder. Arm length sets your reach: short arms are the most stable, while longer arms give you more freedom to position the device.

RAM Mounts overall and socket-to-socket arm lengths by ball size
Arm Length	Measurement	A Size	B Size — this product's ball size	C Size	D Size	E Size
Short	Overall Length	N/A	2.42"	3.56"	5.69"	5.69"
Short	Socket-to-Socket Length	N/A	1.75"	2.5"	4.66"	4.66"
Medium	Overall Length	2.42"	3.73" — this product	5.69"	8.44"	12.63"
Medium	Socket-to-Socket Length	1.75"	3"	4.66"	6.88"	9.88"
Long	Overall Length	3.56"	6"	9.13"	12.98"	N/A
Long	Socket-to-Socket Length	3.12"	5.31"	8"	11.41"	N/A