month we point out important specific details about bearings.
Details you might have wondered about and details critical for bearings
sold to the U S Government.
For part one of this article, click here
Since posting our article titled “Bearings – Made
in the USA….Are they really?? (DFARS Regulations)”, we have received
overwhelming response and positive feedback.
Numerous Government facilities have contacted us
regarding this subject. We have also heard from many companies
producing end products that include bearings. The results have led
to policy changes in the way these bearings are purchased moving
forward. We have concluded that ultimately the U.S. Government
wants “100% MADE IN THE USA” bearings. If a source exists that
can produce them, and many still do, the US Government must purchase
Foreign bearings are making their way into defense
equipment and facilities at an increasing and alarming rate. In
some cases, even counterfeit versions of leading brands have been
supplied. Visit “counterfeit bearings’ on the web for many
articles addressing this subject.
Most distributor sales people, whether
local or nationwide, are simply not aware of the available USA sources
and are quick to respond with “That bearing is only made overseas,”
without investigating further.
National’s Government Sales Department will
provide valuable assistance in sourcing and supplying USA manufactured
products when and where required.
Bruce Dumas, Director of Government Sales
Silver Thin precision thin section
bearings are used in numerous exotic and high tech
applications. Made entirely in the USA, they provide precision and
performance in applications such as robotics, aerospace, machine
tools, semiconductor manufacturing and medical equipment.
Applications requiring thin profiles are ideal for thin section
bearings. They are available in bore sizes from 1” to 36”with
cross sections from 3/16 to 1”. Stainless steel and sealed
versions are also available to meet specific application
requirements. Silver Thin bearings are manufactured in three
The C-Type – Is a “Radial
Contact” type of conventional bearing design. It has a single row
of balls which allows for Conrad-type assembly. The C-Type is
most commonly used among the three thin section types. Although
the radial type is used primarily in applications with radial loads, it
can withstand moderate axial and reversing loads as well as moment
The A-Type - Is an “Angular Contact”
type bearing with a reduced shoulder on one side of the inner or outer
race ball path. These bearings accept radial loads and single
direction thrust loads. The A-Type requires an application of
thrust to establish the appropriate race and ball contact angle.
These bearings are commonly used in pairs for applications requiring
axial loads in one direction or for reversing axial loads. They
provide the appropriate stability, load capacity and repeatability
needed in applications requiring higher speeds than the C-Type.
The X-Type - Is a “4-Point Contact”
bearing used where a high level of rigidity is required. This
bearing can accept radial and thrust loads in either direction.
They are also extremely effective with high moment loads. X-Type
bearings are designed with gothic raceways creating 4 contact points
between each ball and the raceway. Preloading will provide for
additional precision and rigidity of movement. X-Type bearings
may be able to replace two thin section bearings in many applications.
Thin section bearings are
specified in areas requiring design efficiency, high precision and
minimal space. Creating space and saving weight are also two key
considerations when selecting thin section bearings. If you have
minimal space, but require rotating movement, the National Precision
Bearing Group’s Technical Sales Specialists will assist you in the
selection of an appropriate thin section type for your application.
Click here to access the Silver
Thin selection guide.
Dave Coffer, Technical Sales
Bearing is now carrying four new Myonic integral shield dental
bearings in stock. These replacement bearings work with the
W&H Synea, Star 430 Solara, and Midwest Stylus handpieces.
All four bearings have integral shields which provide several distinct
advantages over their standard removable shielded counterparts.
The integral shielded bearings provide better shielding capabilities,
allow for a better fit, and provide tighter tolerances. The
tighter tolerances reduce radial play variation and lessen vibration and
noise in the handpiece, resulting in a more comfortable experience for
the patient. All these factors also result in better performance
and a longer life for the bearing. For more information, ask
your technical sales specialist about these new top of the line dental
Tom Koetje, Miniature Bearing Product
National know if there are bearing specifics you would
like us to cover in a future newsletter.
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NATIONAL PRECISION BEARING GROUP of Mechatronics, Inc.
Phone: 800-426-8038 • 425-222-5900 • Fax: 888-448-1153 • 425-222-5950
Copyright © 2010, National Precision Bearing, Inc.