What does 'file-fit' mean for these piston rings?

File-fit means the rings are intentionally made slightly larger than the cylinder bore. You will need to carefully file the ends of the rings to achieve the precise end gap specified for your engine build. This allows for custom tuning of compression and oil control.

What are the specific dimensions of these rings?

The top and second compression rings are 1.5mm thick, and the oil control ring is 3.0mm thick. The set is also +.005 inches oversized, intended to be filed down.

Can these rings be shipped to California?

No, these rings are not CARB approved and cannot be shipped to California due to emissions regulations.

Mahle Piston Rings 4355MS-15 - File Fit

Name: Mahle MS 4.350in+ .005in 1.5 1.5 3.0 mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-350in-005in-1-5-1-5-3-0-mm-file-fit-rings-t14-29807
Price: 179.36 USD
Availability: BackOrder

Mahle MS 4.350in+ .005in 1.5 1.5 3.0 mm File Fit Rings

$179.36

On Backorder

Order now to reserve yours — we'll ship as soon as stock arrives. Full refund if we're unable to fulfill.

Mahle MS 4.350in+ .005in 1.5 1.5 3.0 mm File Fit Rings. These rings are designed for engine rebuilds where precise fitment is key.

Key Features

Universal fit piston ring set.
Top and second rings measure 1.5mm thick.
Oil control ring measures 3.0mm thick.
Standard tension design.
+.005 inch sizing allows for file-fitting to achieve precise cylinder gap.
Designed for engine builders who need to set exact ring end gaps.

These are universal fit piston rings. Check manufacturer specifications to confirm compatibility with your specific engine build.

⚠️ CA WARNING: This product can expose you to chemicals known to the State of California to cause cancer and/or birth defects or other reproductive harm. Learn more

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Product Details

Mahle is well-known for making solid engine components, and these file-fit piston rings are a great example of their work. If you're rebuilding an engine and need rings that you can precisely tailor to your cylinder walls, these are a solid option. They come in a standard tension design with specific dimensions: the top and second rings are 1.5mm thick, and the oil control ring is 3.0mm thick. The '+' designation and '.005in' in the description mean these rings are slightly larger than standard and are designed to be file-fit, allowing you to achieve the exact gap needed for optimal sealing in your specific application.

File-fit rings are a popular choice for performance builds or when dealing with worn cylinders, as they let you set the precise end gap. This is crucial for controlling compression and oil consumption. While these are universal fit, they are intended for engine builders who know how to measure and file the rings to the correct specification for their engine build. Remember, these are not CARB approved and cannot be shipped to California.