This is 18mm OD Rigid Shaft Coupling manufactured by Ruland. The manufacturer part number is MCLX-6-6-SS. Its accurate length is 30mm.

Ruland 18mm OD Rigid Shaft Coupling

Manufacturer:

Ruland

Manufacturer Part No:

MCLX-6-6-SS

Enrgtech Part No:

ET20162618

Warranty:

Manufacturer

£ 32.27

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Coupling Types:

Rigid Coupling

Bore:

6mm

Outside Diameter:

18mm

Length:

30mm

MCLX-6-6-SS-Datasheet(Technical Reference)

MCLX Couplings Data Sheet(Technical Reference)

MCLX / MSPX / MCLC / MSPC One- and two-piece rigid couplings Data Sheet(Technical Reference)