Copyright © 2025 National Products Inc. Seattle, Washington. All rights reserved.
RAM Mounts USA LLC - 8410 Dallas Avenue South, Seattle, WA 98108, USA
Overview
This version of the spring-loaded RAM® Quick-Grip™ holder provides a secure fit for a variety of large phones and other devices. Included is a medium length RAM® double socket arm and a 2.5” drill-down round ball base featuring the universal AMPS hole pattern. The ball and socket system provides shock and vibration damping, and allows for near-infinite adjustability to achieve an ideal viewing and operating angle of your device.
Features
- Spring-loaded holder features adjustable side supports that provide a secure fit for a variety of large phones and other devices; easily insert and remove your phone with one hand
- Includes 2.5" drill-down round ball base, medium length B size RAM® double socket arm, and diamond ball base; ball and socket technology allows for near-infinite adjustability
- Made of powder-coated, marine-grade aluminum and high-strength composite for durability and reliability in the most demanding environments
- Backed by a lifetime warranty
hardware included:
Assembly Hardware
holder dimensions:
Height Range: 5.75" - 7.25"
Width Range: 2.625" - 3.625"
Max Depth: .72"
socket to socket length:
3"
hole pattern:
4-Hole AMPS: 1.181" x 1.496"
3-Hole 120-Degree: 1.812" Diameter
plate size:
2.5" Diameter
ball size:
B Size (1")
weight capacity:
Standard Use: 2 lbs
Heavy-Duty Use: 1 lb
materials:
Marine-grade aluminum
High strength composite
packaging type:
Poly Bag
Weight:
0.81 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
Have a Question?
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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.
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Will this fit a iPhone 16 pro max with a otter box defender?
Thanks for reaching out! This mount is compatible with your device as long as your iPhone 16 Pro Max (with the case on) falls within these dimensions:
Height Range: 5.75" - 7.25"
Width Range: 2.625" - 3.625"
Max Depth: .72"
Please feel free to reach out to our team if you have any additional questions- We are always happy to help!
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it shows compatibility with Samsung galaxy s20 ultra and the s22 ultra. i have an s21 ultra and the size difference is minimal (actually a hair smaller on the s21) would this work with an s21?
Yes, the RAM-B-138-PD4U will accommodate a Samsung S21 Ultra. The full range of compatible dimensions is provided in the Holder Dimensions section on the product page.





