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

File fit means the end gap of the piston rings is not pre-set. You will need to measure the ring in your cylinder bore and file down the ends to achieve the correct gap specification for your engine, as outlined in the service manual.

Are these rings suitable for a performance engine build?

These steel, standard tension, file-fit rings are a solid option for many engine rebuilds, including performance applications where precise gapping is desired for optimal sealing and compression.

Why are these rings not CARB approved?

This particular piston ring set is not approved by the California Air Resources Board (CARB). Therefore, it cannot be legally shipped to or installed on vehicles registered in California.

Mahle Piston Ring Set 4625SS-043 - Universal

Name: Mahle MS 4.620in+.005in .043in .043in 3.0mm Steel STD Tension File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-620in-005in-043in-043in-3-0mm-steel-std-tension-file-fit-rings-t14-132147
Price: 240.74 USD
Availability: BackOrder

Mahle MS 4.620in+.005in .043in .043in 3.0mm Steel STD Tension File Fit Rings

$240.74

On Backorder

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

Mahle steel piston ring set, standard tension, file fit. Universal application.

Key Features

Fits universal applications.
Steel construction for durability.
Standard tension design.
.043" top and second ring width.
3.0mm oil ring width.
+.005" oversize for bore clearance.

⚠️ 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 is a Mahle steel piston ring set, specifically the 4625SS-043 model. These rings are designed for a standard tension application and feature a file-fit end gap, meaning you'll need to gap them to your specific piston and cylinder bore during installation. They measure .043 inches for the top and second rings, and 3.0mm for the oil ring, with a +.005 inch oversize to account for bore wear or honing.

Mahle is a well-known name in engine components, and this set is built with steel for durability. The file-fit design gives you the flexibility to achieve a precise seal in a variety of engine builds, which is crucial for proper compression and oil control. Because they are file-fit, these rings are a popular choice when rebuilding or refreshing an engine where exact clearances are important.

Please note 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 gapping specifications.