

RAM Mounts Add-A-Ball Accessory Ball (RAM-B-273-CU) lets you mount a second device on an existing C-size RAM mount. The 1" B-size ball sits on a 5/16"-18 threaded stud that replaces the bolt of a short or medium C-size double socket arm, so the extra ball protrudes from the middle of the arm on the side opposite the knob. Ideal when there is no room for a second base – for example a phone or scanner next to a tablet in a vehicle.
📦 What's in the box – RAM-B-273-CU
- Add-A-Ball accessory ball – B-size 1" ball on a 5/16"-18 threaded stud
- Bolt – 5/16"-18 × 4"
- Split lock washer – 5/16"
💡 To get started, you might also consider a short B-size double socket arm and a device holder such as the X-Grip phone holder for the second device.
Key Features
- Second device, one base – adds a B-size ball to the middle of an existing C-size double socket arm
- Simple installation – the threaded stud replaces the arm bolt; 5/16"-18 × 4" bolt and lock washer included
- Fits short and medium C arms – designed for short and medium C-size double socket arms; not for the long C-size arm
- Load rating – up to 2 lb (0.9 kg) in standard use and 1 lb (0.45 kg) in heavy-duty use; ideal for phones, GPS units, scanners and small tablets
- Built for harsh conditions – powder-coated marine-grade aluminium, backed by RAM's lifetime warranty
Compatibility
- RAM C-size (1.5") short and medium double socket arms
- All RAM B-size (1") double socket arms and ball components
Technical Specifications
| Part Number | RAM-B-273-CU |
|---|---|
| Product Type | Ball adapter, B-size |
| Connection | B-size (1" / 25.4 mm) ball; 5/16"-18 threaded stud (replaces the C-size arm bolt) |
| Load Capacity | 2 lb (0.9 kg) standard use; 1 lb (0.45 kg) heavy-duty use |
| Material | Powder-coated marine-grade aluminium |
| Weight | 0.07 kg (0.16 lb) |
| Warranty | Lifetime warranty (RAM Mounts) |
| In the Box | Add-A-Ball accessory ball, bolt, split lock washer |
You will find matching cradles, holders and more RAM mounting parts in our Mobile Terminal Accessories collection. Planning a vehicle or forklift installation, or ordering for a whole fleet? Contact us for project support and volume pricing.
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