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:
Prefix4T - 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|
|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|