World-Class Mounting Systems

Size Guide

Ball Sizes
Arm Sizes
X
The unique double ball and socket design allows you to adjust your mount to the perfect viewing or operating angle, all with the turn of a single knob. This modular design can be configured with a variety of interchangeable components to fit your specific mounting needs.
B Size
Holds 2 lbs / 0.91 KG
1" Ball
Phones, Action Cameras, Light Duty Tablets
C Size
Holds 4 lbs / 1.81 KG
1.5" Ball
Fishfinders, Heavy Duty Tablets
D Size
Holds 6 lbs / 2.72 KG
2.25" Ball
Monitors, Large Fishfinders
E Size
Holds 15 lbs / 6.8 KG
3.38" Ball
Heavy Monitors
Ball Sizes Short Arm Medium Arm Long Arm
B Size Overall Length 2.42" / 6.1468cm 3.73" / 9.47cm 6.00" / 15.24cm
Socket-to-Socket Length 1.75" / 4.45cm 3.00" / 7.62cm 5.31" / 13.49cm
C Size Overall Length 3.56" / 9.04cm 5.69" / 14.45cm 9.13" / 23.19cm
Socket-to-Socket Length 2.50" / 6.35cm 4.66" / 11.84cm 8.00" / 20.32cm
D Size Overall Length 5.10" / 12.95cm 8.44" / 21.44 12.98" / 32.97
Socket-to-Socket Length 3.60" / 9.14cm 6.88" / 17.48cm 11.41" / 28.98cm
E Size Overall Length 7.31" / 18.57cm 12.63" / 32.08cm N/A
Socket-to-Socket Length 4.98" / 12.65cm 9.88" / 25.10cm N/A

RAM® Drill-Down Mount for Garmin GPSMAP 73, 78, 78S, 78SC

SKU Copied
SKU: RAM-B-138-GA40
UPC Copied
UPC: 793442929496

RAM® Drill-Down Mount for Garmin GPSMAP 73, 78, 78S, 78SC
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SKU: RAM-B-138-GA40
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| UPC: 793442929496

B SIZE
MEDIUM ARM
Size Guide
The RAM-B-138-GA40 consists of a double socket arm, 6.35cm (2.5") diameter round base with the universal AMPS hole pattern, diamond adapter base and custom high strength composite cradle for the Garmin GPSMAP 78 series. Designed into the mount is a 2.54cm (1") diameter patented rubber ball and socket system with adjustment points at the base and cradle. With a twist of the arm knob, you can move the flat surface GPSMAP mount to your optimum viewing position.

Information

Compatible Devices

Information

Product Weight
0.31 kg (0.68 lbs)
Hardware Included
Assembly Hardware
Socket To Socket Length
7.62cm (3")
Hole Pattern
4-Hole AMPS: 3.00 cm (1.181") X 3.80 cm (1.496") 3-Hole 120-Degree: 4.60cm (1.812") Diameter
Plate Size
6.35cm (2.5") Diameter
Ball Size
B Size (1")
Weight Capacity
Standard Use: 0.91 kg (2 lbs) Heavy-Duty Use: 0.45 kg (1 lbs)
Materials
Marine-grade aluminumHigh strength composite
Packaging Type
Retail Bag

Compatible Devices

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Components

RAM Mounts
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RAM-B-138U
RAM® Double Ball Drill-Down Mount with Diamond Plate - Medium
RAM Mounts
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RAM-HOL-GA40U
RAM® Form-Fit Cradle for Garmin GPSMAP 73, 78, 78S, 78SC


Complete Your Solution

RAM Mounts
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RAM-B-138U
RAM® Double Ball Drill-Down Mount with Diamond Plate - Medium
RAM Mounts
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RAM-HOL-GA40U
RAM® Form-Fit Cradle for Garmin GPSMAP 73, 78, 78S, 78SC

Locking Knobs for B Size Socket Arms

RAM Mounts
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RAM-KNOB3LU
RAM® Key Lock Knob with Brass Insert for B Size Socket Arms
RAM Mounts
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RAM-KNOB3LSU
RAM® Key Lock Knob with Steel Insert for B Size Socket Arms
RAM Mounts
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RAP-S-KNOB3-4U
RAM® Pin-Lock™ Security Knob with 4-Pin Pattern for B Size Socket Arms
RAM Mounts
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RAP-S-KNOB3-5U
RAM® Pin-Lock™ Security Knob with 5-Pin Pattern for B Size Socket Arms
RAM Mounts
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RAP-S-KNOB3-7U
RAM® Pin-Lock™ Security Knob with 7-Pin Pattern for B Size Socket Arms
RAM Mounts
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RAP-S-KNOB3-6U
RAM® Pin-Lock™ Security Knob with 6-Pin Pattern for B Size Socket Arms
RAM Mounts
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RAP-S-KNOB3U
RAM® Pin-Lock™ Security Knob for B Size Socket Arms

Diamond Plate Accessories

RAM Mounts
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RAP-462NPT
RAM® Vibe-Safe™ with NPT Adapter for 2-Hole Holders
RAM Mounts
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RAM-HOL-ROTO1U
RAM® Roto-View™ Adapter Plate
RAM Mounts
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RAM-MAG-1U
RAM® Screen Magnifier for Handheld Devices
RAM Mounts
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RAP-326FU
RAM® EZY-Mount™ Quick Release Female Adapter
RAM Mounts
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RAP-326U
RAM® EZY-Mount™ Quick Release Adapter Kit
RAM Mounts
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RAM-MAG88DU
RAM® Tough-Mag™ 88MM Diameter Magnetic Adapter with 2-Hole AMPS Pattern

Accessories for AMPS Pattern Base Components

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RAM-GDS-DOCKB-SAM75U
GDS® Tough-Dock™ Body for Samsung Tab A7 10.4
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RAM-GDS-DOCKB-SAM65U
GDS® Tough-Dock™ Body for Samsung Tab A 10.1 SM-T510
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RAM-GDS-DOCKB-AP32U
GDS® Tough-Dock™ Body for Apple iPad 10th Gen, Pro 11 & Air 11
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RAM-202-225B-2U
RAM® Backing Plate Adapter
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RAM-GDS-DOCKB-SAM78U
GDS® Tough-Dock™ Body for Samsung Tab S10+, S9+, S8+ & More
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RAM-GDS-DOCKB-SAM76U
GDS® Tough-Dock™ Body for Samsung Tab S7 11" & Tab S9 FE
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RAM-GDS-DOCKB-SAM62U
GDS® Tough-Dock™ Body for Samsung Tab Active3 and Tab Active2
RAM Mounts
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RAM-HOL-ROTO1U
RAM® Roto-View™ Adapter Plate
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RAM-MARI-NUT-4U
RAM® Mari-Nut™ Rubber Expansion Mounting Hardware
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RAM-MARI-RIVET-4U
RAM® Mari-Rivet™ Aluminum Pop Rivets
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RAP-365B-1-339U
RAM® Triple Ball and Socket Magnetic Base with AMPS Hole Pattern
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RAP-403FU
RAM® Spacer Plate Accessory for Flush Mounting
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RAP-400-202U
RAM® Trolling Motor Stabilizer - Tough-Claw™ .625" - 1.14" Medium Arm
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RAP-356U
RAM® Adapt-To-RAM™ Hole Pattern Plate Adapter
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RAP-403U
RAM® Cable Manager with AMPS Hole Pattern for Electronic Mounts
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RAM-GDS-DOCKB-SAM67U
GDS® Tough-Dock™ Body for Samsung Tab A 8.4 SM-T307
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RAP-404-202U
RAM® Trolling Motor Stabilizer - Tough-Claw™ 1” - 1.6” Medium Arm
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RAM-GDS-DOCKB-SAM66U
GDS® Tough-Dock™ Body for Samsung Tab A 10.5 SM-T590 & T-597
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RAM-GDS-DOCKB-SAM55U
GDS® Tough-Dock™ Body for Samsung Tab A 8.0 (2019) SM-T290 & T-295
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RAM-GDS-DOCKB-SAM80U
GDS® Tough-Dock™ Body for Samsung Tab A9 & A7 Lite 8.7”
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RAM-GDS-DOCKB-SAM63U
GDS® Tough-Dock™ Body for Samsung Tab A 8.0 (2018) SM-T387
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RAM-GDS-DOCKB-SAM83U
GDS® Tough-Dock™ Body for Samsung Tab A8 10.5 SM-X200
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RAM-GDS-DOCKB-AP37U
GDS® Tough-Dock™ Body for iPad Pro 12.9 3rd - 6th Gen, Pro 13 & Air 13
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RAM-B-101-225B-NFCU
RAM® NFC Extender with Dashboard Mount
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RAM-GDS-DOCKB-SAM62-NFCU
GDS® Tough-Dock™ Body for Tab Active3 with NFC Extender
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RAP-400-D-202U
RAM® Trolling Motor Stabilizer - Tough-Claw™ .625" - 1.14" Long Arm
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RAP-DOCK-SBLU
RAM® Large Side Accessory Bracket for Vehicle Docks
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RAM-GDS-DOCKB-SAM88U
GDS® Tough-Dock™ Body for Samsung Tab A9+
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RAM-GDS-DOCKB-SAM54NU
GDS® Tough-Dock™ Body for Samsung Tab Active Pro
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