WJ series needle roller and cage assemblies
RADIAL NEEDLE ROLLER AND CAGE ASSEMBLIES
REFERENCE STANDARDS:
• ANSI/ABMA 18.2 – needle roller bearings – radial, inch design.
Before selecting specifi c inch series radial needle roller and cage assemblies, the engineering section should be reviewed.
There are two primary constructions of inch series needle roller
and cage assemblies. WJ assemblies are heavy-duty compared to WJC
assemblies due to the nature of the roller diameter.
CONSTRUCTION
Radial needle roller and cage assemblies have a steel cage that provides both inward and outward retention
for the needle rollers. The designs provide maximum cage strength
consistent with the inherent high load-ratings of needle roller
bearings.
Accurate guidance of the needle rollers by the cage bars allows for
operation at high speeds. Needle roller and cage assemblies have
either one or two rows of needle rollers.
Also available (by request) are needle roller and cage assemblies
using molded, one-piece glass-reinforced engineered polymer cages.
These operate well at temperatures up to 250° F (120° C) over
extended periods. However, care should be exercised when bearings
are lubricated with oils containing additives, as service life may
be reduced if the operating temperature exceeds 212° F (100˚ C). At
such high temperatures, oil can deteriorate with time and it is
suggested that oil change intervals are observed.
Needle rollers with relieved ends – used in these assemblies are
made of high carbon chrome steel through-hardened, ground and
lapped to close tolerances for diameter and roundness. See the
engineering section for further discussion of relieved end rollers.
DIMENSIONAL ACCURACY
The nominal inch assemblies, WJ and WJC, contain needle rollers
manufactured to only one diameter grade. Within any one assembly,
the needle rollers have a total diameter tolerance of 0.0001 in.
(0.003 mm).
The limit to precision of the radial clearance of mounted needle
roller and cage assemblies is the capability of the user to hold
close tolerances on the inner and outer raceways.
The tolerance of the overall width of these assemblies is given in
the bearing tables of this section.
MOUNTING DIMENSIONS
The needle roller and cage assembly normally uses the shaft and
housing as the inner and outer raceways. To realize full bearing
load rating and life, the shaft and housing must have the correct
geometric and metallurgical characteristics.
The tables of dimensions for these assemblies list the suggested
diameters for the shaft when used as the inner raceway. These are
consistent with ISO h5 shaft raceway tolerances. Additional design
details for shafts used as inner raceways can be found in the
engineering section.
Since the housing normally serves as the outer raceway, it should
be of suffi cient cross section to maintain adequate roundness and
running clearance under load. The tables of dimensions also list
the suggested diameters for the housings when used as outer
raceways. These are consistent with ISO G6 housing bore tolerances.
Additional design details for housings used as outer raceways can
be found in the engineering section.
The suggested mounting diameter tolerances for these needle roller
and cage assemblies will provide correct running clearance for most
applications.
The needle roller and cage assembly must be axially located by
shoulders or other suitable means. End locating surfaces should be
hardened to minimize wear. For satisfactory operation, minimum
axial clearance should be 0.008 in. (0.203 mm). When using type WJ
assembly, fi llets adjacent to the assembly must not exceed 0.03
in. (0.762 mm) radius. When it is necessary to use fillets adjacent
to WJC assembly, please consult your representative for
suggestions.
Fig. B-5 . Types of inch series radial needle roller and cage
assemblies
FAQ:
1. What is your the payment condition?
For regular products,No advance payment is needed, you can make
100% payment before shipment accordingly.
For customized products,our payment term normally is 30% of
advance, the balance 70% against copy of BOL.
For our long term customers,you can pay 1 month after receiving the
good.
2. What is your sales turnover?
Our whole year sales turnover in 2023 to 2024 is 11 million dollars
3. Do you have any certifications?
Yes, We are an IATF16949 certified needle bearings manufacturer
since 2011.
4.What about the lead time?
Our production period is 30-45 days
5.What is your production capacity?
We are able to produce over 100 million pieces of bearings per year
with different sizes and types
About us:
ChangzhouZhihua Bearings Co.,Ltd. is an ISO9001 & TS16949 certified
company which specializes in manufacturing high quality
drawn up
needle roller bearings,
cylindricial roller bearings and Related Components. We registered our own Trade Mark "CZH" in
2011.
Founded in 2004, CZH has grown to be one of the leading
Manufacturer of Needle Roller Bearings, Cylindrical Roller
Bearings. CZH is capable of Manufacturing both standard and custom
bearings, we are dedicating to provide high quality products with
competitive price since establishment. With the support of it's
Engineering Department CZH is able to offer solutions and new
projects which well suit the different requirements.
CZH's Know-how, Innovation, Solution and the most up-to-date
production system are making CZH expand and develop constantly.
Our products are competitive worldwide.
Allow us an opportunity to use our expertise to meet your bearing
needs.
