Complete Guide to Air Suspension Fab Parts: Types, Materials, and Buying Tips

Air suspension systems rely on a network of fabricated parts—from brackets and mounting plates to air springs and plumbing components. Whether you're building a custom setup from scratch or upgrading an existing one, understanding the different types of air suspension fab parts and what makes them reliable is essential. This guide covers the key components, materials used, and practical tips for selecting parts that fit your vehicle and performance goals.

What Are Air Suspension Fab Parts?

Fab parts refer to components that are manufactured through fabrication processes—cutting, bending, welding, and machining. In the context of air suspension, these include metal brackets, control arms, bag mounts, shock mounts, and custom lines. Unlike off-the-shelf universal kits, fab parts are often designed for specific vehicle applications or custom builds, allowing for precise fitment and improved performance.

Common Types of Air Suspension Fab Parts

Brackets and Mounting Plates

Brackets secure the air bags, shock absorbers, and other suspension components to the chassis or axle. Common types include:

• Bag brackets: Hold the air spring in place, often with a mounting hole pattern that matches the bag.
• Shock mounts: Connect shocks to the frame or axle, sometimes adjustable for ride height.
• Control arm brackets: Retrofit or reinforce existing control arms for air bag clearance.

When choosing brackets, look for thick steel (around 3/16" to 1/4") with clean welds and minimal flex. Zinc plating or powder coating adds corrosion resistance.

Air Springs (Bags)

Air springs are the rubber and plastic bladders that inflate to support the vehicle's weight. Fab parts often include custom bag mount assemblies that allow bags to be installed in non-standard locations. Double-convoluted bags offer a good balance of load capacity and ride comfort, while sleeve bags provide more travel for lowered vehicles.

Plumbing and Fittings

Fittings, tubing, and valves connect the air supply to the bags. Common materials:

• Nylon tubing: Flexible, lightweight, and inexpensive. Use 1/4" or 3/8" OD.
• Stainless steel braided hose: More durable and resistant to abrasion, ideal for exposed areas.
• Push-to-connect fittings: Easy to install and reliable if properly seated.

Make sure all fittings are rated for the operating pressure (typically 150-200 psi). Avoid plastic fittings in high-heat zones near exhaust.

Fabricated Control Arms

Aftermarket control arms designed for air suspension often feature adjustable length or mounting points. They allow fine-tuning of alignment and wheel position. Look for arms made from DOM tubing or billet aluminum with polyurethane or heim joints for minimal play.

Sway Bar Links and Track Bars

To maintain stability, custom sway bar links and track bars are sometimes needed. Fab parts here include adjustable links with heim joints or rod ends. Ensure they have enough clearance for the air bag when fully compressed.

Materials Used in Air Suspension Fab Parts

• Mild Steel: Most common, strong, and easy to weld. Requires coating to prevent rust. Ideal for brackets and mounts.
• Stainless Steel: Corrosion-resistant and strong, but harder to weld. Good for exposed parts like shock mounts.
• Aluminum: Lightweight and corrosion-resistant, but less stiff than steel. Used for control arms and some brackets where weight saving is important.
• Chromoly (4130): High strength-to-weight ratio, often used in racing applications. Requires careful welding and heat treatment.

How to Choose Quality Fab Parts

1. Thickness and Gauge: For brackets and mounts, 3/16" to 1/4" steel is standard. Thinner parts may flex or crack under load.
2. Weld Quality: Look for clean, consistent welds with no porosity or slag inclusion. MIG or TIG welds are preferred over stick.
3. Finish: Powder coating is more durable than paint. Zinc plating works for indoor or low-exposure parts.
4. Fitment: Parts designed for your specific vehicle year and model will save you hours of modification. Always verify with the manufacturer's fitment guide.
5. Hardware: Quality fasteners (grade 8 bolts, lock nuts) prevent loosening from vibration.

Fabrication Considerations for Custom Builds

If you're fabricating your own parts, keep these points in mind:

• Clearance: Ensure the bag doesn't rub against the frame, tire, or other components at any ride height.
• Strength: Reinforce mounting points where the suspension attaches. A bracket can be the weakest link if not designed properly.
• Adjustability: Incorporating slotted holes or threaded adjusters can make alignment easier.
• Maintenance: Design so that parts can be accessed for service without major disassembly.

Buying vs. Building Fab Parts

• Buying: Pre-fabricated parts from specialized manufacturers offer proven designs, precise fitment, and often a warranty. This is the easiest route for most DIYers.
• Building: Custom fabrication allows unique layouts but requires welding skills, a plasma cutter or bandsaw, and proper measuring tools. It's more time-consuming and riskier if you're not experienced.

Where to Look for Air Suspension Fab Parts

Look for specialty off-road, hot rod, or lowrider suppliers that produce dedicated air suspension components. Many manufacturers list detailed product dimensions and installation notes online. Forums and enthusiast communities often share real-world experiences with specific brands and part numbers.

Final Recommendation

For most custom builds, investing in quality pre-fabricated air suspension fab parts from a reputable supplier is the smart move. Focus on brackets made from 3/16" or thicker steel, double-convoluted air bags from well-known brands, and stainless steel or nylon tubing with push-to-connect fittings. If your budget allows, upgrade to chromoly or billet aluminum components for weight savings in a performance build. Always verify compatibility with your vehicle's specific year, make, and model before purchasing. Take the time to review installation guides and ask questions—better to spend a little more upfront than to deal with failures or poor fitment later.