How to Install a RAM 2" Square Post Clamp Mount on a Truck

By RAM Mounts Google Search | Published: 2026-10-22

Category: How-to Guides

Step-by-step guide to installing the RAM 2" Square Post Clamp Mount on a truck's roll bar or headache rack. Includes tips for a secure fit and common mistakes to avoid.

Quick Answer

To install a RAM 2" Square Post Clamp Mount on a truck, clamp the mount to a 2" square post (like a roll bar or headache rack), then attach your device plate and secure the ball and socket arm.

Why the RAM 2" Square Post Clamp Mount Works for Trucks

Many trucks come with square tubing in their headache racks, roll bars, or bed stiffeners. The RAM 2" Square Post Clamp Mount is designed specifically for 2" square posts, making it a clean, no-drill option for mounting phones, tablets, or GPS units. The flat edge clamp grips the post securely without damaging the paint, and the included D-size 2.25" ball and socket system handles devices up to 6 lbs.

One trade-off: the clamp only fits 2" square posts. If your truck uses round tubing or a different size, you'll need a different mount. Also, the medium arm provides good reach but may not be long enough for extra-large cabs—check your device position before tightening everything down.

Installation Steps

1. Choose the mounting location: Select a 2" square post on your truck's roll bar, headache rack, or bed stiffener. Ensure the post is clean and free of debris so the clamp grips evenly. Check that the post is exactly 2" square—the clamp won't fit larger or smaller posts.
2. Open the clamp and position it: Loosen the clamp's knob or bolt until the jaws open wide enough to slide over the post. Place the clamp on the post at your desired height and angle. Make sure the clamp is level and the ball base faces the direction you want your device to point. A common mistake is tightening before aligning the ball.
3. Tighten the clamp securely: Turn the knob or bolt clockwise until the clamp is snug against the post. Do not overtighten—the clamp should hold firmly without deforming the post or stripping the threads. If the clamp slips, add a thin rubber shim (like a piece of inner tube) between the clamp and post for extra grip.
4. Attach the ball and socket arm: Thread the medium arm's ball end into the clamp's socket. Tighten the knob just enough to hold the arm in place but still allow adjustment. Leave the arm slightly loose so you can pivot it to your preferred angle before final tightening.
5. Mount your device plate: Attach the 2 3/8" 2-hole pattern plate (included) to the arm's other ball end. Then secure your device cradle or holder to the plate using the provided hardware. Double-check that the plate's hole pattern matches your device mount. If not, you may need an adapter plate.
6. Adjust and final tighten: Position your device at the desired angle and height, then tighten all knobs firmly. Give the mount a gentle shake to confirm it's secure before placing your device. Re-tighten after a few days of driving—vibration can loosen the knobs slightly.

What You'll Need

RAM® 2" Square Post Clamp Mount with 2 3/8" 2-Hole Pattern Plate: Complete kit with a flat edge clamp for 2" square posts, a D-size 2.25" ball and socket system rated for 6 lbs, and a medium arm. The clamp fits common truck roll bars and headache racks without drilling, and the 6 lb capacity covers most phones, tablets, and small GPS units.
RAM® 2" Square Post Clamp Mount with 2 3/8" 2-Hole Pattern Plate