The 1 piece earphone bearing ACB4252H7 is a compact doublerow angular contact bearing designed for bicycle applications. It features a 45°/45° contact angle and is specified by the model ACB4252H7 with a package of 1 piece. The bearing size is 42 x 52 x 7 mm (inner diameter 42 mm, outer diameter 52 mm, width 7 mm), making it suitable for tight, spaceconstrained installations. Key benefits Balanced load handling: the 45°/45° angular contact design provides good support for both axial and radial loads, improving rigidity in compact assemblies. Compact footprint: 42 x 52 x 7 mm size enables installation in limited spaces typical of bicycle components and small mechanical assemblies. Easy replacement: compatible as a replacement bearing in components that accept the ACB4252H7 size and configuration. Consistent fit: modelspecific tolerance indicated by the H7 designation supports reliable mating with compatible parts. Product attributes Model: ACB4252H7 Size: 42 x 52 x 7 mm (inner diameter 42 mm, outer diameter 52 mm, width 7 mm) Type: 45°/45° angular contact, doublerow bearing Packaging: 1 piece Application: bicycle bearing (as described in the product title) Tolerance: H7 (implied by the model designation) Material: not specified in the listing Compatibility and performance notes Designed for use in components that accommodate a 42x52x7 mm doublerow angular contact bearing with a 45°/45° contact angle. Suitable for installations where simultaneous axial and radial load support is beneficial and where space is limited. For results, install according to standard bearing handling practices and verify fitment with mating parts. Use cases Use case 1: a worn or degraded bearing in a bicycle component that accepts a 42 x 52 x 7 mm doublerow angular contact bearing (ACB4252H7). Use case 2: Integrate into small mechanical assemblies or hobby projects requiring a compact 45°/45° angular contact bearing with precise load handling. Use case 3: Apply in precision RC models or other compact equipment where space constraints demand a smalldimension, doublerow angular contact bearing. Care and installation tips Handle with clean hands and use proper tools to avoid damage. Check compatibility with mating parts to ensure correct seating and clearance. Follow standard lubrication and seating practices appropriate for angular contact bearings.