4T-JM718149/JM718110PK bearing reference breakdown
Below we will break down the 4T-JM718149/JM718110PK 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
The suffix can be found at the end of the bearing number:
SuffixPK - Tolerance class K (ABMA, J series) (for inch items only)
|d (mm)||90||D (mm)||140||B (mm)||34|
|C (mm)||27||T (mm)||35||a (mm)||33|
|rs min (mm)||3||r1s min (mm)||2.5||e||0.44|
|ra max (mm)||3|
|Dynamic load C (kN)||189||Rating life coefficient A2||1.4||Static load C0 (kN)||279|
|Nlim (oil) (Tr/min)||3200||Nlim (grease) (Tr/min)||2400||Min operating temperature Tmin (°C)||-40|
|Max operating temperature Tmax (°C)||120||Characteristic cage frequency FTF (Hz)||0.44||Characteristic rolling element frequency BSF (Hz)||8.18|
|Characteristic outer ring frequency BPF0 (Hz)||9.73||Characteristic inner ring frequency BPFI (Hz)||12.27|