Damper Bolts

Do your old bolts no longer fit the harmonic damper, or are you switching to a new damper in your build? Here we have gathered damper bolt kits with different threads, lengths, head styles and materials, so you can match your exact installation.

What harmonic damper bolt kits do

The bolts hold the damper components and any pulleys together so they can handle the forces generated at high RPM. The range consists of bolt kits from ATI. Many of the kits combine two sizes, e.g. six 5/16-18 x 1 and three 3/8-16 bolts, because there are typically different mounting points on the same damper.

How to choose the right bolt kit

• Thread: 3/8-16 and 3/8-24 have the same diameter but different pitch. The thread must match the damper or pulley.
• Length: From 1 to 2 inches. The right length depends on the material thickness of the pulley and any spacers.
• Head style: Button head or flat head in aluminium. Flat head typically requires countersunk holes.
• Version: Some kits are for 5" dampers, some are marked "Not Chrysler", and others replace specific ATI part numbers.
• Material: There are, for example, kits in titanium and kits in plain steel without a stainless finish.

Installation and maintenance

Tighten the bolts to the torque specified by the manufacturer. Use threadlocker if the instructions call for it. Check old bolts for stretched or damaged threads before reusing them. If you find loose bolts, you should also inspect the damper itself. If you need bolts elsewhere on the car, see our chassis bolts and universal bolts, or go to the parent category bolts.

Frequently asked questions

What is the difference between 3/8-16 and 3/8-24 bolts?

Both have a diameter of 3/8 inch. The number after the hyphen indicates the number of threads per inch, so 3/8-24 has a finer thread than 3/8-16. They are not interchangeable, so the bolts must match the thread in the damper or pulley.

Can I reuse the old bolts when the damper comes off?

That depends on the condition of the bolts and the manufacturer's instructions. If the threads are stretched, damaged or corroded, you should switch to a new kit, as loose bolts can cause imbalance and damage the damper.

How do I find the bolt kit that fits my ATI damper?

Compare thread, length, head style and damper size with your damper. Several kits are listed as replacements for specific part numbers, e.g. 950200 or 950266. This makes it easier to find the right kit if you know your original number.