MA332Q Antifriction Bearings

CURRENT INDUSTRIAL REPORTS SERIES
2007

MA332Q — ANTIFRICTION BEARINGS (SHIPMENTS)
DEFINITIONS AND SPECIAL INSTRUCTIONS

1. Scope of Survey

3. Definitions

This survey covers all companies engaged in the
manufacture of complete antifriction bearings and
components, including balls and rollers, in the United
States. Plain bearings are not collected on this
survey.

ANTIFRICTION BEARINGS — Bearings using rolling
elements, i.e., balls or rollers. Plain bearings, i.e.,
those with no rolling elements, are not to be included.
BALL BEARINGS, COMPLETE, UNMOUNTED —
Antifriction bearings using balls as rolling elements.

2. Figures to be reported
Companies with more than one establishment
manufacturing the products covered by this survey are
requested to complete a separate report form for each
location. If you have not received a separate form for
each of your establishments, please call the contact
listed on the report form or write to the U.S. Census
Bureau for additional forms.
a. Quantity and value of shipments
The figures on quantity and value of shipments should
include the physical shipments of all products sold,
transferred to other establishments within your
company, or shipped on consignment, whether for
domestic or export sale. The value represents the net
sales price, f.o.b. plant, to the customers or branch to
which the products are shipped, net of discounts,
allowances, freight charges, and returns. Shipments
to your own branches should be assigned the same
value as comparable sales to unaffiliated customers;
i.e., the value includes an appropriate allocation of
company overhead and profit. Products bought and
resold without further manufacture should not be
included in shipments.
b. Columnar structure of report
When posting your figures to the original report,
please be sure to report information in the correct
columns. These are:
Column 1 — Quantity of shipments
(domestic and export)
Column 2 — Value of shipments ($1,000) (domestic
and export)
Column 3 — Quantity produced for all purposes
includes total quantity of balls and rollers
produced in thousands of units, whether
shipped or produced and consumed at
the same establishment.

Annular ball bearings — Antifriction bearings primarily
designed to support load perpendicular to shaft axis.
More commonly called "radial" ball bearings.
Ground or precision ball bearings — Excludes all
unground ball bearings.
Single-Row Conrad Ball Bearings — Deep groove ball
bearings with only one row of balls and a cage (i.e.,
retainer, separator). Included are all standard and
special types, all inner race configurations (extended,
wide, etc.,) and all outer race configurations
(spherical O.D., cylindrical O.D., wide, etc.)
MINIATURE BALL BEARINGS — Ball bearings with
outside diameter below, but not including, 3/8" or 9mm
O.D.
ABEC 1 and ABEC 3 — The "regular" standards of
ground ball bearings precision. (Item code 2101)
ABEC 5 and up — The higher, or "precision" standards
of ground ball bearings precision. (Item code 2102)
Single-row maximum capacity type distinguished from
the conrad type by a filling slot in both outer and
inner rings which allows the bearings to contain a
greater number of larger balls than the corresponding
conrad bearings without filling slots. Also known as
"max" type or "full complement" or "filling slot" ball
bearings. (Item code 2114)
Integral shaft and integral spindle ball bearings — Have a
solid inner race, i.e., a shaft, which has the ball
raceway(s) ground into the shaft surface, thus making
the inner race/shaft integral to the bearings.
Examples include, but are not restricted to, water
pump bearings, some automotive hub units, and
computer spindle bearings. (Item code 2118)
Double row ball bearings — Unitary bearings with two
rows of balls. Includes both angular contact and deep
groove types, and both conrad and max types. All

Page 1 of 5

CURRENT INDUSTRIAL REPORTS SERIES
MA332Q

DEFINITIONS AND SPECIAL INSTRUCTIONS — Continued
Cups shipped separately —Tapered bearing outer
races. (Item code 2233)

3. Definitions — Continued
ABEC 1 and up of all standard and special
configurations are to be included, but self-aligning
double row ball bearings should not be included.
(Item code 2120)

Cone assemblies shipped separately— Tapered
bearing inner race, with cage and rollers. (Item code
2234)

Angular contact ball bearings — Have a single row of
balls whose internal clearances and ball race
locations are such as to result in a definite contact
angle and predetermined relationship of inner to outer
ring faces. All standard and special configurations
and all ABEC 1 and up precisions are included. (Item
codes 2121 and 2123)
All other ground or precision bearings (ABEC 1 and up)
— This category should include only those ground
ball bearings, etc., which cannot be classified above.
(Item code 2124)

Cylindrical roller bearings — Antifriction bearings using
cylindrical shaped rollers as the rolling elements.
Axes of rollers are parallel to the bearing axis.
Regular (ABEC 1 and 3) and precision (ABEC 5 and
up) are reported separately, but within each category
all types and configurations should be included;
single-row and multi-row, radial and thrust, traction
motor, journal, aeroengine, and others, except those
classified as needle roller bearings, as defined below.
(Item codes 2311 and 2312)
Spherical roller bearings — Self-aligning antifriction
bearings using convex (spherical, or barrel-shaped or
concave hourglass shaped) rollers as the rolling
elements. Within each category of single-row and
double-row types, all configurations of radial and
thrust, and all precisions should be included: geared
outer, spherangular, air frame, and all other similar
types. (Item codes 2324 and 2325)

Ground ball bearings of less than ABEC 1 precision —
All types of radial (single-row, double-row, angular
contact, other) ball bearings which have ground
raceways but are less than the ABEC 1 precision
grade. (Item code 2126)
Unground (less than ABEC 1) — Antifriction ball
bearings with unground raceways. All radial types,
styles and configurations should be included.
(Item code 2128)

Needle roller bearings — Antifriction bearings using
“needle” rollers as the rolling elements. Needle
rollers are cylindrical shaped but are long and slim,
with a uniform diameter not exceeding 5mm and
having a length of at least three times the diameter.
The ends of the rollers may be of several shapes.
(Item code 2341)

Thrust ball bearings — Concentric axial loading only,
both ground (less than ABEC 1 and up) and
unground types, of all configurations. Both single
direction thrust and double direction thrust ball
bearings are to be included. Do not include angular
contact bearings. (Item codes 2133 and 2135)

Linear roller bearings — Roller bearings designed for
linear relative motion between its raceways in the
direction of rolling. (Item code 2351)

Linear ball bearings — Ball bearings designed for
linear relative motion between its raceways in the
direction of rolling.

Other roller bearings, n.e.c. — This category should
only include those roller bearings not classified
above. (Item code 2393)

Other ball bearings — Those which do not qualify
under any of the previous categories. This category
should only include those bearings which cannot be
classified above. (Item code 2155)
Tapered roller bearings, including cups and cones,
unmounted — Antifriction bearings using
taper-shaped rollers as rolling elements.
Cup and cone assemblies shipped as a set — This is a
complete tapered roller bearing, which includes the
cup and cone and roller assembly, each of which may
be sold separately. (Item code 2232)

Mounted bearings (except plain) — Antifriction ball or
roller bearings which are encased (mounted) in an
enclosure (a mounting, or housing, or housing
closure) usually made of iron, steel, or rubber. The
enclosure, or housing, may be of a one-piece unit) or
two-piece (split) construction. Major types included
are pillow blocks, flange units, takeup units, rubber
tired bearings, and any other types of mounted
bearings. Loose bearing inserts sold separately are
not to be included here, but should be included in
appropriate bearing categories above. (Item codes
2417–2455)

Page 2 of 5

CURRENT INDUSTRIAL REPORTS SERIES
MA332Q

DEFINITIONS AND SPECIAL INSTRUCTIONS — Continued
Housings and parts and components for housings —
Includes housing closures, collars, spacers, sleeves,
adapters, and other miscellaneous items. (Item code
2959)

3. Definitions — Continued
Parts and components for ball and roller bearings
(except cups and cones) including balls and rollers
sold separately — as described in the following:
Balls — Ball bearing type steel balls of all grades.
Shipments — Should include the physical shipments of
all products sold, transferred to other establishments
within your company, or shipped on consignment,
whether for domestic or export sale.
Production — For all purposes, both for internal
production of bearings or other products, and for
external shipments. (Item code 2911)
Other antifriction ball bearing component and parts,
including unassembled ball bearings, cages, races, seals,
shields, etc. No bearings are to be placed in this
category. (Item code 2921)

NOTE: Bearing types such as rod ends and cam
followers/track rollers should be placed in the
appropriate bearing category such as single row deep
groove conrad type, spherical roller, cylindrical roller,
etc.
4. Comparability
Data reported in this survey should correspond to data
reported in the Economic Census - Manufacturing Sector
form. The sum of values for item codes shown in column
(a) should correspond to dollar values reported under
product codes indicated in column (b) below.

Rollers — Roller bearing typed steel rollers of all
grades.
Shipments — Should include the physical shipments of
all products sold, transferred to other establishments
within your company, or shipped on consignment,
whether for domestic or export sale.
Production — For all purposes, both for internal
production of bearings and other products, and for
external shipments. (Item code 2931)
Other roller bearing parts and components, (except rollers)
Examples include, but are not restricted to seals and
shields. Also, no bearings are to be placed in this
category. (Item codes 2942–2953)

Page 3 of 5

Current Industrial
Reports
(Form MA332Q)

Economic Census Manufacturing Sector

Item codes
(a)

Product codes
(b)

2101 through 2155

3329911100

2232 through 2234

3329913100

2311 through 2393

3329915100

2417 through 2455

3329917100

2911 through 2959

3329919100

CURRENT INDUSTRIAL REPORTS SERIES
REFERENCE LIST — Continued
FORM

MA332Q
ANTIFRICTION BEARINGS (SHIPMENTS)

Product
code

Item
code

Item description

BALL BEARINGS, COMPLETE, UNMOUNTED
Annular, include self-aligning
Ground or precision
Single-row conrad
Miniature (below 9mm. O.D.)
Regular (ABEC 1 and 3)
Precision (ABEC 5 and up)
Other regular (ABEC 1 and 3)
9mm. O.D. thru 30mm. O.D.
Over 30mm. O.D. thru 52mm. O.D.
Over 52mm. O.D. thru 100mm. O.D.
Over 100 mm. O. D.
Other Precision (ABEC 5 and up)
9mm. O.D. thru 30mm. O.D.
Over 30mm. O.D. thru 52mm. O.D.
Over 52mm. O.D. thru 100mm. O.D.
Over 100 mm. O. D.
Single-row maximum capacity type
Integral shaft and integral spindle ball bearings
Double-row
Angular contact
Regular
Precision
All other ground or precision bearings (ABEC 1 and up)
Ground bearings of less than ABEC 1 precision

3329911101
3329911102

2101
2102

3329911103
3329911104
3329911105
3329911107

2103
2104
2105
2107

3329911109
3329911111
3329911112
3329911113
3329911114
3329911118
3329911120

2109
2111
2112
2113
2114
2118
2120

3329911119
3329911123
3329911124
3329911127

2121
2123
2124
2126

3329911129

2128

3329911133
3329911135

2133
2135

Thrust ball bearings
Ground
Unground

3329911155

2155

Other ball bearings

3329911100

2199

TOTAL, complete, unmounted ball bearings (Sum of item codes 2101–2155)

3329913132
3329913133
3329913134

2232
2233
2234

TAPERED ROLLER BEARINGS, INCLUDING CUPS AND CONES, UNMOUNTED
Cup and cone assemblies shipped as a set
Cups shipped separately
Cone assemblies shipped separately

3329913100

2299

Unground (less than ABEC 1)

TOTAL, tapered roller bearings, including cups and cones, unmounted (Sum of item
codes 2232–2234)

Page 4 of 5

CURRENT INDUSTRIAL REPORTS SERIES
REFERENCE LIST — Continued
FORM

MA332Q

Product
code

Item
code

Item description

ROLLER BEARINGS (EXCEPT TAPERED), UNMOUNTED
3329915111
3329915112

2311
2312

Cylindrical roller bearings
Regular (ABEC 1 and 3)
Precision (ABEC 5 and up)

3329915124
3329915125

2324
2325

Spherical roller bearings, including hourglass and barrel
Single-row
Double-row

3329915141

2341

Needle roller bearings

3329915193

2393

Other roller bearings, n.e.c.

3329915100

2399

TOTAL, roller bearings, (except tapered), unmounted (Sum of item codes
2311–2393)

MOUNTED BEARINGS (EXCEPT PLAIN)
3329917117

2417

Ball bearings, unit and/or split mounted

3329917153
3329917155

2453
2455

Roller
Unit-mounted
Split-mounted

3329917100

2499

TOTAL, mounted bearings (except plain) (Sum of item codes 2417–2455)
PARTS AND COMPONENTS FOR BALL AND ROLLER BEARINGS (EXCEPT CUPS
AND CONES), INCLUDING BALLS AND ROLLERS SOLD SEPARATELY

3329919111

2911

Balls (thousands of units)

3329919121

2921

Other antifriction ball bearing components and parts, including unassembled
ball bearings, cages, races, seals, shields, etc. (except balls)

3329919131

2931

Rollers (thousands of units)

3329919135
3329919136
3329919137
3329919149

2942
2944
2946
2953

Other roller bearing parts and components (except rollers)
For tapered roller bearings (except cup and cone assemblies)
For cylindrical roller bearings
For spherical roller bearings
For other roller bearings

3329919159

2959

Housings and parts and components for housings, including housing closures,
collars, spacers, sleeves, adapters, and other miscellaneous items

3329919100

2999

TOTAL, parts and components for ball and roller bearing (except cups and cones),
including balls and rollers sold separately (Sum of item codes 2911–2959)

10/25/07

Page 5 of 5