ACL bearings are used for tuning and engine upgrades where you want better quality with higher bearing capacity than normal standard bearings. Improvements of material, dynamic thickness, heat conduction, oil grooves and oil distribution are some of the points that make ACL one of the leading bearing manufacturers. Bearing data Part number: 4B1912H Bearing size: .025 Bearing half type: Identical halves Bearing material: F781 Technical data (mm) Max overall length: 19.4 Max shaft size: 48 Max tunnel size: 51.024 Max vertical oil clearance: 0.055 Max wall at crown: 1.496 Min shaft size: 47.98 Min tunnel size: 51.004 Min vertical oil clearance: 0.02 Technical data (in) Max overall length: 0.763778007 Max shaft size: 1.889760017 Max tunnel size: 2.008814898 Max vertical oil clearance: 0.00216535 Max wall at crown: 0.058897521 Min shaft size: 1.888972617 Min tunnel size: 2.008027498 Min vertical oil clearance: 0.0007874 Engine code F20C1 / F20C2 / F22C1 / H22A1 / H22A2 / H22A4 / H22A5 / H22