tailieunhanh - NTN, BALL AND ROLLER BEARING CATALOG Part 2

Tham khảo tài liệu 'ntn, ball and roller bearing catalog part 2', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Boundary Dimensions and Bearing Number Codes NTN standardized and have been listed here for purposes of future standardization there are many standard bearing dimensions which are not presently manufactured. Boundary dimensions for radial bearings excluding tapered roller bearings are shown in the attached tables. Bearing numbers Rolling bearing part numbers indicate bearing type dimensions tolerances internal construction and other related specifications. Bearing numbers are comprised of a basic number followed by supplementary codes. The makeup and order of bearing numbers is shown in Table . The basic number indicates general information about a bearing such as its fundamental type boundary dimensions series number bore diameter code and contact angle. The supplementary codes derive from prefixes and suffixes which indicate a bearing s tolerances internal clearances and related specifications. Bearing number examples 6205ZZC3 2A Shell Alvania 2 grease Radial internal clearance C3 shielded both Nominal bore diameter 25mm Diameter series 2 Deep groove ball bearing 23034BD1 EZ-------------Lubrication hole lubrication groove when outer diameter is less than 320mm ---------------------------- Type B ----------------------------Nominal bore diameter 170mm ----------------------------Dimension series 0 ----------------------------Width series 3 Spherical roller bearing 240 750BK30 Bore diameter tapered inner ring bore standard taper ratio 1 30 Type B Nominal bore diameter 750mm Dimension series 0 Width series 4 Spherical roller bearing NU320G1C3 51120L1P5 Tolerances JIS Class 5 High strength machined brass cage Nominal bore diameter 100mm Diameter series 1 Height series 1 ------------------------------Thrust ball bearing 4T - 30208 A-29 Boundary Dimensions and Bearing Number Codes NTN Table Bearing number composition and arrangement Supplementary prefix code Special application material heat treatment code 4T 4T tapered roller bearings ET ET tapered roller