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

File fit means the end gap of the top compression ring is not pre-set. You will need to file the ends of the top ring to achieve the correct gap for your specific cylinder bore size during installation.

What does the '+.005in' sizing indicate?

The '+.005in' indicates that these rings are slightly larger than the standard size for their nominal bore diameter. This allows for fine adjustment during the ring gapping process to ensure a perfect fit in the cylinder bore.

Are these rings suitable for all engine builds?

These are file-fit rings, commonly used in performance or custom engine rebuilds where precise gapping is desired. They are not CARB approved and cannot be shipped to California.

Mahle Piston Ring Set 4145ML-043 - File Fit

Name: Mahle MS 4.140in+.005in .043in .043in 3.0mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-140in-005in-043in-043in-3-0mm-file-fit-rings-t14-29710
Price: 192.78 USD
Availability: BackOrder

Mahle MS 4.140in+.005in .043in .043in 3.0mm File Fit Rings

$192.78

On Backorder

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

Mahle file fit piston ring set. Features .043", .043", 3.0mm rings and a +.005" size for a precise fit.

Key Features

This set includes file-fit piston rings with dimensions of .043", .043", and 3.0mm.
The rings are designed as low-tension.
This set is sized at +.005 inches, offering a slight oversize for precise fitting.
File-fit design allows for custom gapping of the top ring to match cylinder bore.
Mahle is a popular brand for engine components.

These rings are listed as universal fitment. It is important to verify compatibility with your specific engine build and cylinder bore dimensions.

⚠️ 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

This Mahle ring set includes file-fit piston rings with dimensions of .043 inches for the top two rings and 3.0mm for the oil ring. They are designed as low-tension rings and come in a +.005 inch size, meaning they are slightly larger than standard to allow for fine-tuning during installation. These are commonly used when rebuilding an engine to ensure a proper seal between the piston and cylinder wall.

Mahle is a well-known name in engine components, and this set is built to meet the demands of engine rebuilding. The file-fit design means you'll need to gap the end of the top ring yourself to match your specific cylinder bore, which is a standard practice for many performance or custom engine builds. This allows for a more exact fit and can help optimize compression and oil control.

Keep in mind that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's specific service manual for proper installation procedures and ring gapping specifications.