Metabo RETAINING RING HC260C - 6401718573

6400009900 supersedes older part numbers: 6401718573

Metabo 6400009900 — Genuine Metabo retaining ring for shafts (16 x 1 mm)

This is the original Metabo retaining ring (circlip) stamped 6400009900, specified as "RETAINING RING FOR SHAFTS 16X1." It’s a spring‑steel shaft retainer used to lock collars, bearings, gears or other components onto a 16 mm shaft by seating into the shaft groove and preventing axial movement. The part is listed as a single item in Metabo parts diagrams.

Key specs (typical/DIN 471 style):

- Nominal size: 16 × 1 mm (fits a 16 mm shaft).

- Cross‑section (thickness): 1 mm.

- Typical DIN‑471 circlip geometry (for reference): inner/fit dimensions ~16 mm nominal, free diameter d1 ≈ 14.7 mm, section width ≈ 2.2 mm (spring steel). Use these values to confirm fit if your shaft/groove dimensions were machined to a nonstandard tolerance.

What it does and why it matters:

This small ring snaps into the machined groove on a shaft and provides the axial stop that keeps rotating assemblies aligned. If it’s missing, worn or distorted the shaft components can shift, produce noise, increase wear, or fail entirely — replacing it restores the original axial retention and alignment.

Example Metabo tools / diagrams where this part appears:

- TS 254 M table saw — listed in the Metabo spare‑parts diagram as 6400009900 (RETAINING RING FOR SHAFTS 16X1).

- HC 260 C planer — appears in the parts list for this planer model.

- Various morticing / attachment diagrams (e.g., HC 333 attachment, MULTI 310 attachment) also reference the same retaining ring in their spare‑parts lists.

Buying / installation notes:

- This is a direct-fit, original Metabo spare part — buy the same size (16×1) if replacing the original ring.

- Installation requires circlip pliers or the correct method for the ring style shown in your tool’s diagram; verify the groove is undamaged before fitting.

If your tool’s parts diagram or model number shows 6400009900, this is the matching Metabo retaining ring to restore proper shaft retention.