Page 614 - Rollingbearings
P. 614
Designation system
7 Needle roller bearings
Designation system
Group 1 Group 2 Group 3 /
Preixes
R Bearing without an inner ring
Basic designation
BK Drawn cup needle roller bearing with a closed end
HK Drawn cup needle roller bearing with open ends
HN Drawn cup needle roller bearing with open ends, full complement
IR Needle roller bearing inner ring
K Needle roller and cage assembly
LR Needle roller bearing inner ring
NA 48, Needle roller bearing with machined rings, with langes, with an inner ring
NA 49,
NA 69
NAO Needle roller bearing with machined rings, without langes, with an inner ring
NK, NKS Needle roller bearing with machined rings, with langes, without an inner ring
NKI, NKIS Needle roller bearing with machined rings, with langes, with an inner ring
NKIA 59, Needle roller / angular contact ball bearing
NKIB 59
NKX Needle roller / thrust ball bearing
NKXR Needle roller / cylindrical roller thrust bearing
NX Needle roller / full complement thrust ball bearing
PNA Alignment needle roller bearing
RN Needle roller
7
Sufixes
Group 1: Internal design
BF Needle roller with lat ends
D Deviating or modiied internal design with the same boundary dimensions
Example: K 40x45x17 D (Needle roller and cage assembly with a double split cage)
DS Single split needle roller and cage assembly
EGS Inner ring with a non-directionally ground raceway
VGS Inner ring with a pre-ground raceway and a machining allowance
ZW Double row needle roller and cage assembly (double row cage)
Group 2: External design (seals, snap ring groove, etc.)
AS.. Outer ring with lubrication hole(s), the number following indicates the number of holes
ASR.. Outer ring with annular groove and lubrication hole(s), the number following indicates
the number of holes
IS.. Inner ring with lubrication hole(s), the number following indicates the number of holes
ISR.. Inner ring with annular groove and lubrication hole(s), the number following indicates
the number of holes
RS, .2RS Contact seal on one or both sides, respectively
• NBR or FKM or PUR for a drawn cup needle roller bearing
• NBR for a machined needle roller bearing
Z Combined needle roller bearing, factory greased thrust bearing with a cover without
lubrication holes over the outside diameter
Group 3: Cage design
TN Glass ibre reinforced PA66 cage
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