Pre-supplementary code - special purpose code material heat treatment code 4T: 4T tapered roller bearing ET: ET tapered roller bearing ETA: ET+ heat treatment E: bearings using carburized steel EA: Carburized on the basis of carburized steel Bearing TA: Nitriding Surface Treatment TM: Special Heat Treatment Bearing F: Stainless Steel Bearing N: High Speed ​​Steel Bearing M: Plating Treatment Bearing 5S: Ceramic Rolling Element Bearing HL: HL Roller Bearing ECO: ECO—Top Tapered Roller Bearing LH: High-temperature long-life bearing steel (STJ2), 250°C tempered dimensionally stabilized bearing TS3: Dimensionally stabilized high-temperature bearing (up to 200°C high temperature) TS4: Dimensionally stabilized high-temperature bearing (up to 250°C high temperature) Subsequent supplementary code Internal change code U: Internationally interchangeable tapered roller bearing R: Internationally non-interchangeable tapered roller bearing ST: Cylindrical roller bearing with low friction moment specification HT: Large axial load specification Tapered roller bearing cage code L1: Car-made high-strength brass cage F1: Car-made carbon steel cage G1: High-strength brass cage with straight pocket holes without rivets G2: Pillar cage J: Stamped steel plate cage T2: Resin molded cage sealing ring, dust cover Code LLB: Synthetic rubber sealing ring (non-contact type) LLU: Synthetic rubber sealing ring (contact type) LLH: Synthetic rubber sealing ring (low friction torque type) Z Z: Dustproof Cover raceway shape code K: inner diameter of tapered hole; standard taper 1:12 K30: inner diameter of tapered hole; standard taper 1:30N: with stop groove NR: with stop ring D: with oil hole D1: with oil groove and oil hole group Matching code DB: back-to-back matching D F: face-to-face matching D T: serial matching D 2: 2 sets of double-linked matching to Tongzhou City G: universal matching + a: with spacer (+a indicates the standard size of the spacer ) Internal clearance, preload code C2: Clearance group is smaller than standard group (CN): Standard clearance group C3: Clearance group is larger than standard group C4: Clearance group is larger than C3 group C5: Clearance group is larger than C5 group CM: Motor-specific radial internal clearance group / GL: Light preload / GN: Standard preload / GM: Medium preload / GH: Heavy preload Accuracy code P6: JIS6 level P5: JIS5 level P4: JIS4 level P2: JIS2 Grade-2: ABMA2 Grade-3: ABMA3 Grade-0: ABMA0 Grade-00: ABMA00 Grade Lubricant/2AS: Shell Alvania S2 Grease/3AS: Shell Alvania S3 Grease/8A: Shell Alvania EP2 Grease/5 K : MUL TEMP SRL Grease/L*11: Barierta JFE552 Grease/LP03: Thermosetting Grease (Grease for Solid Lubricating Bearings) The above only introduces some basic codes of NTN bearings. If you encounter codes that you don’t understand in the future, you can Feel free to consult the company.
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