Roller Bearings Specifications

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Bearing Design


	Roller Bearing Type:
	Your choices are...
	Cylindrical Courtesy of CCTY Bearing		Cylindrical roller bearings have high radial load capacity and moderate thrust loads. They contain rollers that are cylindrical in shape. The rollers are not true cylinders; they are crowned or end relieved to reduce stress concentrations. This geometry translates to low friction and high-speed applications. Cylindrical roller bearings are commonly available in precision grades (RBEC-5). Lubrication for cylindrical roller bearings is usually oil, which also serves as a coolant.
	Crossed		Cross roller bearings consist of rollers with an axis of rotation that is alternately crossed between a split outer ring and an inner ring. These bearings are capable of handling complicated loads (radial, thrust and moment loads).
	Single-Row Tapered Courtesy of CCTY Bearing		Tapered roller bearings consist of an inner ring (cone), an outer ring (cup), a cage and rollers which are profiled to distribute the load evenly across the roller. They have high radial and axial (thrust) load capacity at low to intermediate speeds. The thrust load capacity for single-row tapered bearings is about 60% of the radial capacity.
	Two-Row Tapered		Two-row or double-row tapered roller bearings have increased radial load capacity compared to single-row bearings. They can also handle thrust loads from both directions. The rollers can be configured in a converging or a diverging orientation. In converging double-row tapered bearings, the contact lines of the rollers to the races converge towards the axis of the bearing rotation. This style does not appreciably increase the rigidity of the shaft mounting. In diverging double-row tapered bearings, the contact lines of the rollers to the races diverge towards the axis of the bearing rotation. This style increases the rigidity of the shaft mounting. Different configurations are also available with a single outer ring and two inner rings or two outer rings and a single inner ring.
	Four-Row Tapered		Four-row tapered bearings consist of four rows of alternating, converging and diverging rollers.
	Spherical Courtesy of CCTY Bearing		Spherical roller bearings are self-aligning, double-row, combination, radial and thrust bearings. The rolling element is a spherical or crowned roller. The outer ring has a spherical race that allows for some misalignment of the shaft and housing. They are unequalled in their capacity for high loads and tolerance to shock loads, but have limited speed capabilities.
	Spacer Assembly		Spacer bearings are two single-row bearings purchased as a matched set. These bearings can be assembled together with the addition of spacers between the inner rings, the outer rings or both the inner and outer rings.
	Cylindrical Roller Thrust		Cylindrical roller thrust bearings consist of a roller and cage assembly. They can be assembled against hardened flat surfaces or with hardened thrust washers. They tolerate much higher loads than thrust needle roller assemblies.
	Spherical Roller Thrust		Spherical roller thrust bearings have a spherical raceway in the outer ring. The rollers are arranged diagonally in single row. Spherical roller bearings have a high axial load capacity and can take moderate radial loads (when an axial load is applied). Due to the nature of the spherical rollers, they can handle some misalignment.
	Tapered Roller Thrust		Tapered roller thrust bearings have conically-shaped (tapered) rollers and are designed for heavy axial load applications. Tapered roller thrust bearings are available with a cage or in a full complement design.
	Hollow Roller		Hollow roller bearings are single-row or double-row radial bearings with an inner ring, an outer ring and hollow or thin-wall rollers. The thin wall in the rollers allows these bearings to be preloaded, as opposed to cylindrical roller bearings with solid rollers. This increases radial stiffness and reduces radial vibration and radial run out. Proper lubrication is critical for proper operation and bearing life. These bearings are used on turbine shafts as well as grinding, milling and workhead spindles where precision and stiffness are a requirement.
	Needle Roller Without Inner		Needle roller bearings are cylindrical roller bearings where the rolling element is long and thin relative to its diameter. These bearings have low cross sections but high radial load carrying capacity. This type has an outer ring, needle rollers, and a cage, but no inner ring.
	Needle Roller With Inner		Needle roller bearings are cylindrical roller bearings where the rolling element is long and thin relative to its diameter. These bearings have low cross sections but high radial load carrying capacity. This type has an outer ring, needle rollers, a cage and an inner ring.
	Needle Roller and Cage Assembly		These bearings consist of needle rollers and a cage. They have no integral inner or outer rings. They can be used with a hardened shaft and housing, or separate, hardened inner and outer rings.
	Drawn Cup Caged Needle		Drawn cup needle bearings consist of needle rollers in a housing drawn from a single sheet of steel.
	Full Complement Drawn Cup Needle		Full-complement drawn cup needle bearings consist of a full complement (no cage) of needle rollers in a housing drawn from a single sheet of steel.
	Combined Needle Roller		These bearings combine needle roller radial bearings with a ball or roller thrust bearing. These bearings can be used for combined radial and axial loading applications.
	Combined Roller (with Stub Axle)		Bearing is a combination of a radial bearing and an axial bearing. A stub axle holds both the radial and axial bearing in place and provides an easy welding point.
	Mast Guide Bearing		Mast guide bearings are heavy-duty bearings designed for use in forklift applications.
	Other		Unlisted, unspecified, or proprietary configuration.
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	Split Bearing		Bearing and housing are completely split around the shaft for easy bearing replacement and inspection.
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	Thin-section		Thin-section bearings have small cross-sections with respect to diameter. They are designed to save space, lower the weight of a design and reduce friction. Some thin-section bearings are also referred to as torque tube bearings.
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Bore Size

Bore

The bearing industry uses a standard numbering system for bearings with metric-diameter bores. If the bore is hexagonal, enter the dimension across the flats. If the bore is tapered, enter the smaller diameter. For bore sizes 04 and up, multiply the bore size by 5 to identify the bore diameter in millimeters (mm). Refer to the table below.

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User may specify either, both, or neither of the "At Least" and "No More Than" values. Products returned as matches will meet all specified criteria.

Tables:

Bore Size (does not list all possible sizes)

Bore Size	Dimension (mm)
00	10mm
01	12mm
02	15mm
03	17mm
04	20mm
05	25mm
06	30mm
07	35mm
08	40mm
09	45mm
10	50mm
11	55mm
12	60mm
13	65mm
14	70mm
15	75mm
16	80mm
17	85mm
18	90mm
19	95mm
20	100mm

Outside Diameter


	Outside Diameter		Enter the outside diameter of the bearing. For housed bearings, include the housing. For flanged bearings, exclude the flange.
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Additional Specs Do not over-specify. Enter only those loads that apply for bearing type and application. Static and dynamic loads may not be available for all bearing types and suppliers.


	Overall Width		Enter the overall width of the bearing or bearing assembly, including the locking collar (if present).
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	Rated Speed (Oil)		The rated speed for a bearing with grease lubrication is lower than that of a bearing with oil lubrication.
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	Static Axial / Thrust Load		Static axial (thrust) load is the maximum axial load a bearing can endure without excessive, permanent deformation.
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	Static Radial Load		Static radial load is the maximum radial load a bearing can endure without excessive, permanent deformation.
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	Dynamic Axial / Thrust Load		Dynamic axial (thrust) load is the calculated, constant, axial load which a group of identical bearings can endure theoretically for a rating life of one million revolutions of the inner ring.
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	Dynamic Radial Load		Dynamic radial load is the calculated, constant, radial load which a group of identical bearings can endure theoretically for a rating life of one million revolutions of the inner ring.
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	Features
	Your choices are...
	Flanged		The bearing has a flange for mounting or locating.
	Spherical Outside Diameter		The bearing is tolerant of misalignment and has a greater load capacity than internal self-alignment, but requires more radial space.
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Bearing Class ANSI: American National Standards Institute AFBMA: Anti-Friction Bearing Manufacturers Association ABEC: Annular Bearing Engineers Committee RBEC: Roller Bearing Engineers Committee Refer to tables below for quality standards and cross reference to other standards organizations. Note: Stretch window to resize table(s).

Cylindrical / Spherical Bearing Class

Many organizations have developed standards, including the American Bearing Manufacturers Association (ABMA), International Organization for Standardization (ISO) and the Deutsches Institut für Normung (DIN). ABEC and RBEC standards are defined by ABMA Standard 20. Similar standards are defined by ISO 492, JIS B1514 and DIN 620. ABEC bearing ratings were established by the Annular Bearing Engineering Committee (ABEC) of the American Bearing Manufacturers Association (ABMA). There are five classes of bearings in the ABEC rating system - 1, 3, 5, 7, and 9. The higher the ABEC rating, the tighter the tolerances and the higher the bearing precision. ABEC 1 bearings are designed for use in lower speed and accuracy applications. RBEC bearing ratings were established by the Roller Bearing Engineering Committee (RBEC) of the American Bearing Manufacturers Association (ABMA). There are five classes of bearings in the RBEC rating system - 1, 3, 5, 7, and 9. The higher the RBEC rating, the tighter the tolerances and the higher the bearing precision. RBEC ratings apply to cylindrical roller and spherical roller bearings. RBEC 1 bearings are designed for use in lower speed and accuracy applications. Although the specifications may differ slightly, the following equivalency can be made between ABMA, ISO and DIN bearing classes. ANSI Standard 20 / ISO 492 / DIN 620 ABEC 1 / Class Normal / P0 ABEC 3 / Class 6 / P6 ABEC 5 / Class 5 / P5 ABEC 7 / Class 4 / P4 ABEC 9 / Class 2 / P2

Your choices are...

RBEC 1 / Class 0 / P0

RBEC 1, Class 0 and P0 bearings are designed for use in lower speed and accuracy applications.

RBEC 3 / Class 6 / P6

RBEC 3, Class 6 and P6 bearings are designed for use in lower speed and accuracy applications.

RBEC 5 / Class 5 / P5

RBEC 5, Class 5 and P5 bearings are designed for use in higher speed and accuracy applications.

RBEC 7 / Class 4 / P4

RBEC 7, Class 4 and P4 bearings are designed for use in higher speed and accuracy applications.

RBEC 9 / Class 2 / P2

RBEC 9, Class 2 and P2 bearings are considered super precision and are designed for use in critical, high-tech applications.

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Tapered Roller Bearing Class

Tapered roller bearing precision and accuracy standards determine bearing tolerances. Many organizations have developed standards, including the American Bearing Manufacturers Association (ABMA), International Organization for Standardization (ISO) and the Deutsches Institut für Normung (DIN). ABEC and RBEC standards are defined by ABMA Standards 19.1 (metric series) and 19.2 (inch series). Similar standards are defined by ANSI B3.19, ISO 578, JIS B1514 and DIN 620.

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Class 4 / Class K / P0

The lowest quality class is Class 4 (ABMA), Class K (ISO) and P0 (DIN). These bearings are considered standard quality and are intended for slower speed and lower accuracy applications.

Class 2 / Class N / P6

Class 2 (ABMA). Class N (ISO) and Class P6 (DIN) is the next higher class above Class 4 / Class K / P0, having slightly tighter tolerances. They are considered standard quality and intended for lower speed and accuracy applications.

Class 3 / Class C / P5

Class 3 (ABMA), Class C (ISO) and Class P5 (DIN) bearings are the lowest class of precision grade tapered roller bearings. These bearings are designed for higher speed and accuracy applications than standard class bearings.

Class 0 / Class B / P4

Class 0 (ABMA), Class B (ISO) and Class P4 (DIN) bearings are precision grade tapered roller bearings designed for higher speed and accuracy applications than standard class bearings.

Class 00 / Class A / P2

Class 00 (ABMA), Class A (ISO) and Class P2 (DIN) bearings are precision grade tapered roller bearings designed for higher speed and accuracy applications than standard class bearings.

Class 000 / Class AA

Class 000 (ABMA) and Class AA (ISO) bearings are the highest precision grade tapered roller bearings designed for use in critical, high-tech applications.

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Tables:

Bearing Standard		Tolerance Class					Bearing Types
AFBMA ANSI	AFBMA/ANSI Std. 20	ABEC-1 RBEC-1	ABEC-3 RBEC-3	ABEC-5 RBEC-5	ABEC-7	ABEC-9	Radial bearings (except tapered roller bearings)
	AFBMA/ANSI Std. 19.1	Class K	Class N	Class C	Class B	Class A	Tapered roller bearings (Metric series)
	AFBMA B 3.19 ANSI Std. 19	Class 4	Class 2	Class 3	Class 0	Class 00	Tapered roller bearings (Inch series)
	AFBMA/ANSI Std. 12.1	--	Class 3P	Class 5P Class 5T	Class 7P Class 7T	Class 9P	Precision instrument ball bearings (Metric series)
	AFBMA/ANSI Std. 12.2	--	Class 3P	Class 5P Class 5T	Class 7P Class 7T	Class 9P	Precision instrument ball bearings (Inch series)
ISO	ISO 492	Normal class Class 6X	Class 6	Class 5	Class 4	Class 2	Radial bearings
	ISO 199	Normal class	Class 6	Class 5	Class 4	--	Thrust ball bearings
	ISO 578	Class 4	--	Class 3	Class 0	Class 00	Tapered roller bearings (Inch series)
	ISO 1224	--	--	Class 5A	Class 4A	--	Precision instrument bearings
JIS	JIS B 1514	Class 0 Class 6X	Class 6	Class 5	Class 4	Class 2	All types
DIN	DIN 620	P0	P6	P5	P4	P2	All types
AFBMA - Anti-friction Bearing Manufacturers Association (ABEC-Ball Bearings, RBEC-Roller Bearings) ANSI- American National Standards Institute ISO- International Organization for Standardization JIS- Japanese Industrial Standards DIN- Deutsch Industrie Norm

Standard ABEC Tolerances Inner Rings (all tolerances in micrometers)
Bearing Bore (mm)	*Bore Diameter +.00mm to**					Width Variation				Radial Runout					Side Runout with Bore				Raceway Runout with Side				Width Inner & Outer Rings
ABEC Rating	1	3	5	7	9	3	5	7	9	1	3	5	7	9	3	5	7	9	3	5	7	9	1-3-5-7	9
0 - 10	-3	-2	-2	-1.5	-1	3	2	1	.5	3	2	1.5	1	.5	3	3	1	.5	6	3	1	.5	-50	-10
10 - 18	-3	-2	-2	-1.5	-1	4	2	1	.5	4	3	1.5	1	.5	4	3	1	.5	6	3	1	.5	-50	-20

Standard ABEC Tolerances Outer Rings (all tolerances in micrometers)
Bearing O.D. (mm)	*Outside Diameter +.00mm to**					Width Variation				Radial Runout					Raceway Runout with Side				Outside Diameter Runout with Side
ABEC Rating	1	3	5	7	9	3	5	7	9	1	3	5	7	9	3	5	7	9	3	5	7	9
0 - 18	-4	-3	-2	-2	-1	4	2	1	.5	6	4	2	1.5	.5	8	3	2	.5	4	3	1.5	.5
18 - 30	-4	-3	-2	-2	-1.5	4	2	1	.5	6	4	2	1.5	1	8	3	2	1	4	3	1.5	.5