RAM® Ball Adapter with AMPS Plate for Garmin GPSMAP 620 & 640

Name: RAM® Ball Adapter with AMPS Plate for Garmin GPSMAP 620 & 640
Brand: RAM Mounts
SKU: RAM-B-347-G4U
Price: 10.84 USD
Availability: InStock
Rating: 5.0 (5 reviews)

RAM® Ball Adapter with AMPS Plate for Garmin GPSMAP 620 & 640 - Main image

RAM® Ball Adapter with AMPS Plate for Garmin GPSMAP 620 & 640 - View 2

$10.84 ~~$15.49~~ In stock

Category: Components

The RAM-B-347-G4 base consists of a 1" diameter rubber ball connected at right angles to a 2" x 1.7" square base. The base has four pre-drilled holes at each corner, making the universal 1.5 x 1.188 (hole spacing) AMPS hole pattern.

Before you pay

Check the method and total at checkout.

When it ships

Allow for processing time as well as the journey to you.

Standard Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

Express Shipping: Handling (business days) 0–1; Transit (business days) 7–15.

View policy

If you need a refund

Keep your order number and contact the store to start.

Please contact us for the refund processing timeframe before returning an item.

View policy

Delivery costs

Review the cost for your destination and chosen service.

Standard Shipping · United States: $0.00

Express Shipping · United States: $3.99

View policy

Returning an item

Check the return conditions before sending anything back.

United States · Return window (days after delivery): 30. Return method: By mail. Return postage: Seller pays.

View policy

Customer Reviews (5.0 / 5 · 5 reviews)

Eli G. ★★★★★ Oct 23, 2026

That 1.5 x 1.188 inch bolt pattern lined up perfectly with the pre-drilled holes on my boat's dash mount, so installation took under five minutes. The rubber ball holds my GPSMAP 640 securely even when I hit choppy water.

Elizabeth V. ★★★★★ Oct 22, 2026

The rubber ball mount gives just enough flexibility to angle my GPS perfectly on the boat dash. Installation took about five minutes using the pre-drilled AMPS plate holes.

Elizabeth ★★★★★ Oct 21, 2026

The pre-drilled holes lined up perfectly with my boat's existing mount pattern, saving me from having to drill new holes. The ball mount holds my GPS firmly even when I hit choppy water.