4004050012 LOCKING RING DIN 471 25X1.2 C67 Woodworking Machine Spare Parts

This is a DIN 471 locking ring, size 25X1,2, made from C67 high-carbon spring steel, for woodworking machinery including Homag. It has a 25 mm inner diameter and 1.2 mm thickness. The part numbers are 4004050012 and 4-004-05-0012. To confirm fit, check that the shaft groove and bore match DIN 471 for a 25 mm shaft and that the ring thickness suits the groove width. The C67 steel is chosen for spring retention under repeated load.

When a shaft-mounted component starts to walk or a bearing loses preload, the cause is often a tired or missing retaining ring. Without a correct DIN 471 ring in the groove, axial play opens up, wear accelerates, and the machine can go out of alignment. Replacing the ring restores the axial location without changing the shaft or housing.

This locking ring is size 25X1,2: 25 mm inner diameter, 1.2 mm thickness, to DIN 471, in C67 high-carbon spring steel. It fits woodworking machinery including Homag. Buyers confirm fit by checking the shaft diameter at the groove, the groove width for a 1.2 mm ring, and that the assembly calls for a DIN 471 external ring.

Before fitting, inspect the groove for burrs, wear, or rounding, because a damaged groove will not seat the ring squarely. The ring must sit fully in the groove with the lugs accessible for the pliers. Once seated, it takes the axial load off the bearing or hub. Check the ring after the first run-in for movement or distortion.

Supply is as the locking ring only; no packaging or customisation is stated. For an enquiry, send the part number 4004050012 or 4-004-05-0012, the size 25X1,2, and the machine model, plus a photo of the old ring and its groove if available. That lets the supplier match the DIN 471 ring to your application.

What the specification fixes, and what it leaves to the machine:

• Shaft retention — The 25 mm inner diameter seats in a DIN 471 groove to hold shaft-mounted parts against axial movement.
• Groove fit check — A 1.2 mm thickness matches the groove width for a DIN 471 ring on a 25 mm shaft.
• Spring steel behaviour — C67 high-carbon spring steel gives the ring the spring tension needed to stay seated.
• Wear point protection — Fitting the correct DIN 471 ring reduces axial play that wears shaft shoulders and bearing seats.
• Installation access — The DIN 471 lug design allows fitting with standard external circlip pliers.
• Replacement identification — Part numbers 4004050012 and 4-004-05-0012 let you match the existing ring on the machine.
• Machine compatibility — The ring is used in woodworking machinery, including Homag, where a DIN 471 25X1,2 ring is specified.
• Load path — Seated in the groove, the ring transfers axial load to the shaft instead of the bearing inner ring.
• Inspection point — Check the ring for distortion after run-in; a ring that has moved indicates a worn groove.
• Material strength — C67 high-carbon spring steel is selected for strength and resistance to wear in repeated use.
• Fit — built for woodworking machines, in the position the original part occupied.

What changes on the shop floor when the right part goes back in:

• Restores axial location. A correct DIN 471 25X1,2 ring takes up axial play so the hub or bearing stays where the assembly drawing puts it, reducing misalignment and rub.
• Fewer comebacks from wrong rings. Matching 25 mm inner diameter and 1.2 mm thickness to the groove avoids fitting a ring that springs out or sits proud and fails early.
• Spring tension that holds. C67 high-carbon spring steel gives the ring the resilience to stay seated under vibration, so it does not flatten or walk out of the groove.
• Simple fit with common tools. The DIN 471 lug pattern means your fitter can install it with standard external circlip pliers, with no special tooling or press needed.
• Easy part matching. Using 4004050012 or 4-004-05-0012 to order removes guesswork when the old ring is bent or unreadable on the bench.
• Known wear point. Because the ring is a wear item, keeping the correct DIN 471 size in stock shortens the repair when axial play appears on the machine.
• Clear enquiry path. Sending the part number, size 25X1,2, and machine model with your enquiry lets the supplier confirm the ring against your application.

It is 25X1,2: 25 mm inner diameter and 1.2 mm thickness, to DIN 471, in C67 high-carbon spring steel.

It is used in woodworking machinery including Homag, but confirm against your assembly by checking the shaft diameter and groove width for a DIN 471 25X1,2 ring.

4004050012 and 4-004-05-0012 both identify this locking ring, so either number can be used to match the part.

C67 high-carbon spring steel, which is chosen for spring retention and wear resistance in repeated use.

Seat the ring fully in the DIN 471 groove using external circlip pliers, after checking the groove for burrs or wear.

Replace it if it is distorted or has lost tension; a ring that has moved or flattened will not hold axial location reliably.

Send the part number 4004050012 or 4-004-05-0012, the size 25X1,2, your machine model, and a photo of the old ring and groove if possible.

No customisation or packaging is stated; the supply is the locking ring as identified by the part numbers and size.