Truefit Engineering Co. Ltd. Manufactures Block Housings for Spherical Roller Bearings. Truefit Engineering Co. Ltd. Has achieved ISO 9001:2000 certifications. Block Housings for Spherical Roller Bearings is available with adapter sleeve. Block Housings for Spherical Roller Bearings, SDJ Plummer is a heavy duty Plummer block housing which is extension of the SD type housing. This block housing is suitable for severe load condition and variety of heavy duty service like in steel industry & cement industry, etc. These bearing housings are dimensionally interchangeable and suitable to bearings of international make like SKF, FAG, NTN, ZKL, TIMKEN, etc.