9A-Cyl521SP01 Onyx 5 Pin Inner Cyl Assembly Key 01 / A01 Sc - Satin Chrome (Hware)

The Lockwood Onyx 5 Pin Inner Cylinder Assembly Key 01 / A01 SC is a specialised replacement cylinder designed for the internal mechanism of Lockwood Onyx sliding patio door locks. Finished in Satin Chrome Pearl, it provides key-operated internal access while retaining compatibility with the Onyx sliding door locking system. This specific variant, 9A-CYL521SP01, features a 5-pin brass tumbler mechanism with a standard Australian C4 key profile and is factory pre-keyed to Key #01 / A01. It is designed as an inner cylinder replacement rather than a complete lock assembly. The modular design allows the internal cylinder to be replaced independently, which can be useful when servicing or replacing a damaged cylinder or changing the keying configuration without replacing the complete Onyx lock furniture.