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

File-fit rings have ends that are not pre-gapped. This means you will need to carefully measure and file them down to achieve the exact end gap specified for your engine's cylinder bore. This allows for very precise tuning of the ring seal.

What is the purpose of the +.005in sizing?

The +.005 inch designation indicates that these rings are intended for a cylinder bore that has been machined to be slightly larger than its original factory size. This is common during engine rebuilds or overhauls.

Are these rings suitable for all engine types?

These are universal fit rings designed for specific dimensions and a file-fit application. While they can be used in many engine builds, you must verify that the dimensions (0.043", 1.5mm, 3.0mm) and the +.005" sizing match your engine's requirements and bore.

Mahle Piston Ring Set MS 4.185in+.005in 4190MS-1115

Name: Mahle MS 4.185in+.005in .043in 1.5mm 3.0mm File Fit Rings
Brand: Mahle
SKU: mahle-mahle-ms-4-185in-005in-043in-1-5mm-3-0mm-file-fit-rings-t14-29729
Price: 189.56 USD
Availability: BackOrder

Mahle MS 4.185in+.005in .043in 1.5mm 3.0mm File Fit Rings

$189.56

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 4.185in+.005in .043in 1.5mm 3.0mm file fit piston ring set. For engine rebuilds needing precise ring gap adjustment.

Key Features

This is a universal fit piston ring set.
Features a 0.043 inch top ring, 1.5mm second ring, and 3.0mm oil control ring.
The rings are file-fit, allowing for precise end gap adjustment.
This set is sized at +.005 inches, intended for slightly over-bored cylinders.
Designed for standard tension applications.

⚠️ 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

When you're rebuilding an engine and need to set the piston ring end gap precisely, a file-fit ring set is the way to go. This set from Mahle gives you the flexibility to achieve the perfect gap for your specific cylinder bore and application. They are designed for standard tension and come in a common size configuration of 0.043 inches for the top ring, 1.5mm for the second ring, and 3.0mm for the oil control ring.

Mahle is a well-known name in engine components, and this set is built to their standards. The file-fit design means you'll need to carefully measure and file the ends of the rings to achieve the correct clearance in the cylinder bore. This is a critical step for proper engine sealing and performance, especially in modified or performance applications where exact tolerances matter. The +.005 inch sizing indicates they are intended for a bore that is slightly larger than standard, common in engine overhauls.

Remember that these rings are not CARB approved and cannot be shipped to California. Always refer to your engine's service manual for the correct ring gap specifications and installation procedures.