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

File fit rings allow you to adjust the end gap to your specific piston and cylinder bore. This means you'll need to carefully file the ends of the rings to achieve the correct clearance for optimal sealing and performance in your engine.

What are the dimensions of these rings?

This set includes top and second rings that are .043 inches thick, and an oil control ring that is 3.0mm thick. They are also +.005 inches oversized to accommodate the file fitting process.

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 .043in File Fit 4050ML-043

Name: Mahle MS 4.045in+.005in .043in .043in 3.0mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-045in-005in-043in-043in-3-0mm-file-fit-rings-t14-29699
Price: 192.78 USD
Availability: BackOrder

Mahle MS 4.045in+.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 rings. .043in, .043in, 3.0mm ring set. Part# 4050ML-043. Universal fit.

Key Features

Fits: Universal
Ring set includes top, second, and oil rings.
Top and second rings measure .043 inches thick.
Oil ring measures 3.0mm thick.
Rings are +.005 inch oversized for file fitting.
Low tension design.

⚠️ 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 good example of their work. If you're rebuilding an engine and need rings that offer a bit more adjustability for a custom fit, these are a strong option. They come in a low tension design with specific dimensions: the top and second rings are .043 inches thick, and the oil ring is 3.0mm. The '+.005in' designation means they are slightly oversized, giving you a little extra room to file them to the exact piston groove clearance you need for a precise seal.

These rings are designed to be 'file fit,' which means you'll need to carefully file the end gap to match your specific piston and cylinder bore. This process allows for a tighter, more accurate seal compared to standard rings, especially in modified or performance engines where precise tolerances are key. Because they are file fit, they offer a unique advantage for builders who want to dial in their engine's performance and ensure optimal compression and oil control. Remember, these are not CARB approved and cannot be shipped to California.