Ball Seat Conversion Washers

OVERVIEW

Precision and safety are the cornerstones of any high-performance air-cooled setup, and when it comes to securing your wheels, there is absolutely no room for error. The EMPI Ball Seat Conversion Washers are the professional solution for enthusiasts who find themselves caught between different wheel and hardware standards. Often, aftermarket lug bolts or high-strength racing studs are manufactured with a 60-degree tapered (conical) seat, yet many of the most iconic Volkswagen and Porsche wheelsincluding factory steelies and legendary Fuchsrequire a radius or ball seat for proper engagement. These conversion washers bridge that gap perfectly, allowing you to use your preferred 60-degree tapered hardware while ensuring the load is distributed across the correct spherical surface area of the wheel lug pocket.

Engineered by EMPI, a name synonymous with Volkswagen performance for decades, these washers are more than just a simple spacer; they are a critical safety component for your drivetrain. Using a tapered bolt in a ball seat wheel creates a dangerous point-load scenario that can lead to galling, cracked wheel seats, or even the catastrophic loosening of the lug nuts while driving. By utilizing these conversion washers, you ensure a full 360-degree contact patch, maintaining the structural integrity of your wheels and providing the clamping force necessary for aggressive street driving or off-road excursions. Whether you are finishing a concourse restoration or building a high-speed desert flyer, these washers provide the peace of mind that your wheels are locked down exactly as the engineers intended.

FITMENT

These conversion washers are designed for universal application on vehicles using 12mm or 14mm lug hardware where a seat profile change is required. They are most commonly used on:

• Air-Cooled VW Beetle: All years requiring ball seat wheel compatibility.
• VW Bus / Transporter: Ideal for early Type 2 models running Porsche-style wheels.
• VW Karmann Ghia: Perfect for transitioning to upgraded wheel sets.
• VW Type 3 (Squareback, Fastback, Notchback): Essential for custom wheel offsets.
• Porsche 356 & 912: Often used when modern high-tensile tapered bolts are employed.
• Aftermarket Wheels: Specifically for wheels designed with a R12 or R14 ball seat profile.

SPECS

• Part Number: 6541-32
• Application: Converts 60-Degree Tapered (Conical) Seat to Ball (Radius) Seat.
• Quantity: Sold as a pack of 4.
• Material: Heavy-duty hardened steel for maximum compression resistance.
• Finish: Corrosion-resistant zinc plating for long-term durability.
• Compatibility: Works with both M12 and M14 lug bolts or studs.
• Outer Diameter: Precision machined to fit standard VW/Porsche lug pockets.
• Thickness: Low-profile design to minimize impact on thread engagement.

PRO TIPS

1. Verify Thread Engagement Depth

Whenever you add a component between the lug nut and the wheel, you are effectively reducing the amount of thread engagement on your wheel studs or bolts. It is absolutely critical to ensure that you still have at least 7.5 to 8 full turns of thread engagement after the washer is installed. If the addition of the conversion washer makes your hardware too short, you must upgrade to longer wheel studs or bolts. Never compromise on the amount of "bite" your threads have, as this is the only thing keeping your wheels attached to the drum or disc assembly.

2. Proper Torque and Re-Torque Sequence

Because these washers create a new interface between the hardware and the wheel, they may "settle" slightly during the first few miles of operation. Always use a calibrated torque wrench to tighten your lugs to the factory-recommended specification (typically 80-90 lb-ft for most air-cooled applications). After the first 25 to 50 miles of driving, it is vital to re-check the torque. Don''t assume they have stayed tight; the physical compression of the washer into the wheel seat is a natural part of the break-in process, and a secondary check ensures long-term safety.

3. Lubrication and Seating

While it is tempting to use heavy grease on lug hardware, you should keep the contact faces of the conversion washer clean and dry to ensure proper friction-based clamping. However, a very light film of anti-seize on the threads themselves (not the seat) can prevent galling in high-heat environments. Before final tightening, hand-spin the lug bolts to ensure the washer is centered perfectly in the wheel''s ball seat. If the washer is slightly off-center during the initial torque-down, it can create a vibration that feels like an out-of-balance tire, so take your time to seat them correctly by hand first.