This listing provides a single piece assembly designed to fix and align components along an optical axis. It includes a fixed ring, locking ring, limit ring, bearing, fixed spindle retaining ring, bushing, positioning ring, and clamping function in one compact unit. Size: Scsaw 4x18x8. Key benefits Precise axial alignment: helps secure components along the optical axis with repeatable positioning to reduce misalignment during operation. Multifunction integration: combines locking, limiting, bearing support, retention, bushings, positioning, and clamping in a single unit to simplify assembly and reduce the need for multiple parts. Easy installation and maintenance: a single piece that supports straightforward mounting and longterm reliability in aligned assemblies. Key attributes Functionality: optical axis fixing, locking ring, limit ring, bearing support, fixed spindle retaining ring, bushing, positioning ring, and clamping. Size: Scsaw 4x18x8. Material: not specified. Performance: designed to provide stable axial positioning and secure retention in assemblies requiring the listed features. Quantity: 1 piece. Compatibility Intended for use in assemblies that require the combined features listed (fixed ring, locking ring, limit ring, bearing, spindle retaining ring, bushing, positioning ring, and clamping). Exact compatibility depends on matching the Scsaw 4x18x8 size to your equipment and mating components. Use cases Optical instrument or laser setup: securing and aligning components along the optical axis to maintain stable focus and alignment. Small spindle or bearing assembly: providing axial retention and precise positioning for reliable operation in compact mechanical systems. Modular mechanism assembly: integrating locking, limiting, and clamping functions with bushings and retainers to streamline assembly and reduce part count.