MinebeaMitsumi, Inc
Miniature / Small-diameter Rolling Ball Bearings
Thank you for your continued patronage of MinebeaMitsumi
products. Since our establishment in 1951 as Japan's first
manufacturer of miniature rolling ball bearings, we have
expanded the scale of our products to include miniature,
instrument and small-diameter rolling ball bearings.
Currently our production is carried out in 13 plants in Japan,
the United States, Singapore, Thailand, China, etc.
Ball bearings are composed of such parts as outer rings,
inner rings, balls, retainers and shields. MinebeaMitsumi
manufactures these parts in-house and has established an
integrated production system that encompasses processing
to assembly. We have the mother plant in Japan and
cooperate with plants in various countries to enable stable
production of high-quality ball bearings at any site.
This catalog revision is centered on the addition of the
modified rating life newly specified in
JIS B 1518:2013.
(Refer to pages 20 to 22 for details)
Small-diameter and miniature rolling ball bearings are used
in a wide range of applications such as computers,
automobiles, home appliances and industrial machinery. In
particular, the proper selection of rolling ball bearings is
important as the performance of rolling ball bearings is
greatly involved in reducing the size/weight and improving
the efficiency of equipment.
On the other hand, the reduction of environmentally
hazardous substances is also important, thus raising
requirements on both bearing performance and
environmental measures. In response to these
requirements, MinebeaMitsumi is actively involved in the
development, design, manufacturing and distribution of
products, delivering environmentally friendly ball bearings.
We hope that this catalog will help you select the ideal
small-diameter and miniature ball bearings.
Introduction Introduction
About the Revision About the Revision
Issuance of Miniature / Small-diameter Rolling Ball Bearings Catalog
MinebeaMitsumi’s Activities...................................... 4
Warnings and Precautions .......................................
5
1. Technical Information
1-1 Bearing Type .....................................................8
1-2 Names and Symbols .......................................10
1-3 Part Numbering System ..................................11
1-4 Selecting a Bearing
1 Specification Process.................................14
2 Application Structure, Required Performance,
Environment ...............................................16
3 Material ......................................................17
4 Shield and Seal ..........................................18
5 Retainer......................................................19
6 Load Rating and Rating Life.......................20
7 Tolerance and Precision Grade .................24
8 Measurement Methods ..............................28
9 Internal Clearance......................................30
Fits .............................................................31
Designs of Shaft and Housing....................33
Preload.......................................................34
Displacement .............................................36
Torque........................................................37
Vibration by forced rotation ........................38
Noise ..........................................................40
Compatibility with Resin Parts....................41
Lubricants...................................................42
1-5 Handling of a Bearing ......................................44
1-6 Trouble Symptoms,
Causes and Countermeasures........................48
2. Dimensions
z Radial deep groove ball bearings
Metric size: Basic (chrome steel / stainless steel) ....52
Metric size: With flange
(chrome steel, stainless steel)..................................60
Metric size: With retaining ring (chrome steel) .........64
z Thrust ball bearings
Metric size: Basic (stainless steel)............................65
z Radial deep groove ball bearings
Inch size: Basic (chrome steel, stainless steel)........66
Inch size: With flange
(chrome steel, stainless steel)..................................68
3. Other Products ....................................................70
4. Terminology.........................................................72
5. Appendix..............................................................74
6. Inspection Equipment..........................................78
7. Sales Offices
List of domestic sales offices...............................
80
List of overseas sales offices...............................81
8. Production Bases ................................................82
Table of Contents
4
MinebeaMitsumi Group's CSR
The MinebeaMitsumi Group believes that enterprises have a mission to contribute to the sustainable development of the global
environment and of humanity, not only through strict adherence to laws and regulations, but also through fair and proper
management of our business in accordance with business ethics. To achieve this mission, we have established the “Five
Principles” as our basic management policy, and on the basis of this policy, formulated the MinebeaMitsumi Group Basic CSR
Policy and the MinebeaMitsumi Group’s CSR Implementation Principles to guide our CSR activities. We also stress the
importance and strive to fulfill the Ten Principles of the UN Global Compact, to which we announced participation in 2012.
The MinebeaMitsumi Group’s Environmental Management
s Be a company where our employees are proud to work
s Earn and preserve the trust of our valued customers
s Respond to our shareholders’ expectations
s Work in harmony with the local community
s Promote and contribute to global society
Basic Approach
The MinebeaMitsumi Group has established an environmental management system based on the MinebeaMitsumi Group
Environmental Policy, and all Group companies are striving to contribute to the protection of the earth’s environment and the
sustainable development of human kind.
As examples of specific initiatives in this regard, we adopted highly energy-efficient equipment and processes and plan to
reduce total Group CO
2 emissions per basic unit of output by 5% by FY2015 compared with the baseline year (FY2010). We are
also strengthening initiatives to minimize waste materials and wastewater from our plants in order to effectively utilize raw
materials and water resources. We also make contributions to the environment through our products, including the active
development of communications control technologies, sensors and new materials which are central to energy management in
highly efficient motors, lighting, and energy conversion devices, as well as “smart” buildings, plants, and urban residential
environments.
Basic Approach
The Five Principles
The Five Principles and our Code of Conduct
In promoting CSR activities, the MinebeaMitsumi Group will
appropriately manage the organization in accordance with
the “Five Principles,” and adhere to its Code of Conduct.
Continuous improvement and raising of awareness
We will put forth goals to be achieved, based on understanding
the MinebeaMitsumi Group’s social responsibilities and the key
problems that need to be addressed, and continue to improve
our CSR activities through implementation and continual review.
We will also strive to raise awareness of CSR among all
employees through CSR activities.
Creation of Social Value through Products
As a manufacturer of precision products supporting society, the
MinebeaMitsumi Group is actively developing reliable products
which reduce energy consumption, and making them widely
available.
Dialogue with stakeholders
Constructive dialogue with stakeholders (employees,
customers, shareholders, local communities, global society,
suppliers, and the environment) allows us to meet
expectations and respond to requests, and we will improve
transparency and accountability in our corporate activities.
The MinebeaMitsumi Group’s CSR Implementation Principles
The MinebeaMitsumi Group conducts business in consideration of the environment in accordance with "the Five Principles", and
contributes to global environmental protection and the sustainable development of mankind.
1. Development and design of environmentally friendly
products
2. Environmental considerations in manufacturing
3. Environmental considerations in procurement and
distribution
4. Environmental considerations for national and local
governments and surrounding areas
5. Contribution to the global society
6. Raising awareness of environmental protection among
our employees
The MinebeaMitsumi Group Environmental Policy
As a manufacturer of precision products supporting society,
the MinebeaMitsumi Group is working toward stable supply
and making reliable products with low energy consumption
widely available, to contribute to the sustainable
development of the global environment and of humanity.
MinebeaMitsumi Group Basic CSR Policy
MinebeaMitsumi's Activities
5
Precautions
In the following circumstances, consult us to make selection.
s
When used in environment of high-speed rotation, high precision,
high/low temperature, high/low humidity and high load.
s When used as important parts such as in aircrafts,
space-related equipment, public facilities of electricity and
gas, etc, automobiles and automobile-related parts,
transportation/logistics equipment, multi-story parking
equipment, lifting equipment, medical equipment, game
machines/equipment, etc.
s When resin is used for parts around rolling ball bearings.
* Depending on the type of resin, grease or oil may cause the
resin parts to deteriorate or break.
s When current may flow through the rolling ball bearings.
s When used in an environment that corrodes metals
(corrosive gas, vapor, liquid).
The performance of rolling ball bearings will decline due to
adhesion/intrusion of foreign matter, rusting and
deterioration of grease, which may cause failure or damage.
Be sure to observe the following when storing.
s Avoid high-temperature and high-humidity environments.
Even while in package, do not place it directly on the floor.
Store on a pallet to insure ventilation.
s Avoid use in an environment that corrodes metals
(corrosive gas, vapor, liquid).
s Do not unpack unless necessary, and do not leave the ball
bearings unprotected. When unpacking, use rubber
gloves, etc. to avoid touching with bare hands.
Selecting a Bearing Bearing Storage
NMB is not responsible for damages to products used in
applications that are unforeseeable by MinebeaMitsumi
Group.
MinebeaMitsumi is not responsible for any damage
caused by ball bearings if modified in any way.
MinebeaMitsumi is not responsible for any damage if
application conditions and/or equipment specifications are
changed after determining the ball bearing specification.
The products described in this catalog are not
manufactured for nuclear equipment. MinebeaMitsumi is
not responsible for damages caused by products used for
nuclear applications.
Warnings
When vibration is applied to equipment incorporating ball
bearings, wear marks due to fine movement (fretting) occur
inside the bearings, causing noise and shortened life. Also,
when impact is applied, the bearings will be scratched or
indented, causing deterioration and shortening life of the
rolling ball bearings, so pay attention to the following points.
s Consider the packaging of equipment incorporating rolling
ball bearings so that vibrations and impacts can be
buffered from the outside. Also, make sure the packaging
does not allow rotary objects such as impellers to move.
s Be careful not to subject the equipment to vibration or
impact during transportation.
s Please confirm the types of lubricants at the time of
purchase. Some sealed and shielded bearings in the
market use only oil lubrication.
s Some ball bearings are subject to export restrictions under
the Foreign Exchange and Foreign Trade Law. To export
these cargoes, an export license from the Minister of
Economy, Trade and Industry of Japan is required.
s The contents of this catalog are subject to change without
notice.
Storage and transportation of equipment
Other
Scratches, indentations or foreign matter entering the
bearings can cause noise and shorten the life of the
bearings, so pay attention to the following points.
s Do not apply impact.
s Keep the operating environment clean.
Installation into equipment
s After assembling the ball bearing, perform an operation
test to make sure it rotates normally. During operation test,
increase the rotational speed as gradually as possible.
s If any abnormalities are found during the operation check,
stop operation immediately and carry out the check. Do
not reuse ball bearings found to be abnormal.
Operation test
Warnings and Precautions