4T-JM720249/JM720210 - NTN Single Row Taper Roller Bearing
4T-JM720249/JM720210 bearing reference breakdown
Below we will break down the 4T-JM720249/JM720210 bearing reference and provide an explanation for each section provided it can actually be broken down. We can split it into 3 parts the prefix, suffix and body of the item code.
The prefix can be found at the beginning of the bearing code:
Prefix
4T - The 4T- prefix designates a tapered roller bearing that is made of a special grade of case-hardened bearing steel and is interchangeable with other manufacturers taper with the same part number.J - Which denotes the bearing is part of NTN's J-Line metric series, belonging to ABMA norm. Can also be associated with all other ABMA prefix (EL,EH,H,HH,HM,M,LM,L,LL)
M - Denotes that the bearing is part of the medium series
| d (mm) | 100 | d1 (mm) | 129 | D (mm) | 155 |
| B (mm) | 35 | C (mm) | 28 | T (mm) | 36 |
| a (mm) | 36.3 | e | 0.47 | Y2 | 1.27 |
| Y0 | 0.7 | Mass (kg) | 2.4 |
| ra max (mm) | 3 |
| Dynamic load C (kN) | 192 | Rating life coefficient A2 | 1.4 | Static load C0 (kN) | 310 |
| Fatigue limit load Cu (kN) | 35.2 | Nlim (oil) (Tr/min) | 2900 | Nlim (grease) (Tr/min) | 2200 |
| Min operating temperature Tmin (°C) | -40 | Max operating temperature Tmax (°C) | 120 | Characteristic cage frequency FTF (Hz) | 0.45 |
| Characteristic rolling element frequency BSF (Hz) | 9.74 | Characteristic outer ring frequency BPF0 (Hz) | 11.29 | Characteristic inner ring frequency BPFI (Hz) | 13.71 |
