Angular Contact Bearings Specifications

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Bearing Design


	Bearing Design:
	Your choices are...
	One Directional Thrust Courtesy of Timken Super Precision		Tolerates some misalignment. Same radial load as deep-groove bearings, but 2-3 times the thrust load.
	Double Direction Thrust		Double-direction angular contact thrust ball bearings are double-row bearings constructed with uniquely designed inner and outer rings. These bearings accommodate thrust loads from either direction. In contrast to other angular contact bearings they have steep contact angles, typically 60°.
	Double Row Courtesy of CCTY Bearing		Double-row angular contact ball bearings have two rows of balls in a single inner and outer ring.
	Double Row Maximum Capacity Angular		Double-row angular contact ball bearings have two rows of balls in a single inner and outer ring. These bearings are similar to double-row angular contact bearings, except that they are of the maximum capacity (filling slot) variety. The higher number of balls results in much higher load carrying capacity.
	Duplex Thrust		Two matching-ground, one-directional thrust bearings used as a set. They are typically used for two-directional thrust loads or very high one-directional thrust loads. Three duplex mounting arrangements are possible.
	Four Point Contact		Single-row angular contact bearings are designed so that the ball has four contact points, two with the outer race and two with the inner race. Four-point contact ball bearings carry radial and axial loads, as well as moment loads in a relatively small space. However, they are intended mainly for axial loads.
	Other		Unlisted, unspecified, or proprietary configuration.
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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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	Ball Screw Support		These bearings are specifically designed for use in ball screw or lead screw applications. Most ball screw support bearings are angular contact bearings with a steep contact angle, such as 60°, and are available in duplex, triplex and quadruplex configurations. Other designs include bearings containing separate thrust and radial roller bearings in a single assembly. Cartridge designs are also available that include a housing, seals and bearings.
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	Flanged		The bearing has a flange for mounting or locating.
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Dimensions

Bore

(click to enlarge)Courtesy of GlobalSpec, Inc.

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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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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Outer Ring Width:

The width of the outer ring.

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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

Operating Specifications 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.


	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 Radial Load		Static radial load is the maximum radial load a bearing can endure without excessive, permanent deformation.
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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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Bearing Class

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...

Unground Bearing

Unground bearings include bearings that are totally unground, partially unground and have precision levels less than ABEC 1.

ABEC 1 / Class 0 / P0

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

ABEC 3 / Class 6 / P6

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

ABEC 5 / Class 5 / P5

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

ABEC 7 / Class 4 / P4

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

ABEC 9 / Class 2 / P2

ABEC 9, Class 2 and P2 bearings are considered super precision and are 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

Special Material / Plating Options


	Stainless Steel		Stainless steel is chemical and corrosion resistant and can have relatively high pressure ratings.
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	Plastic		Any of numerous organic, synthetic or processed materials that are mostly thermoplastic or thermosetting polymers of high molecular weight and that can be made into objects, films, or filaments.
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	Ceramic Balls		A ceramic hybrid bearing is constructed of steel inner and outer rings with ceramic (typically Si₃N₄⁾ balls in place of steel. These bearings have several advantages over all steel bearings, such as higher speed and acceleration capability, increased stiffness, higher accuracy, lower friction and heat generation, reduced lubrication requirements, low thermal expansion and extended operating life. Bearings containing all ceramic balls are also nonconductive and are commonly used in electric motor applications.
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	Plated		Bearing is plated; common plating materials are cadmium and chrome.
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Seals / Shielding


	Seals / Shielding:		Seals and shields provide protection from contamination and as a retainer for lubricant. Seals provide better protection and lubricant containment than shields, but have lower maximum speed capabilities.
	Your choices are...
	None (Open Bearing)		Bearing is open; it has no seals or shields. Open bearings offer no protection from contamination or lubricant containment, but have higher maximum speed capabilities than bearings with seals or shields.
	Single Seal (click to enlarge)Courtesy of GlobalSpec, Inc.		Bearing has one seal to prevent the ingress of dirt.
	Double Seal		Bearing has two seals to prevent the ingress of dirt.
	Single Shield (click to enlarge)Courtesy of GlobalSpec, Inc.		Bearing has one shield to prevent the ingress of dirt.
	Double Shield		Bearing has two shields to prevent the ingress of dirt.
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Lubrication Options The most common bearing lubrications are grease or oil. Consult supplier for the best lubrication for an application.


	Relubricatable		This applies to sealed bearings only. Relubricatable bearings have provisions for relubricating the bearing (usually with grease) without removing the seals.
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	Prelubricated		Bearing is prelubricated from the factory. Bearings with seals and shields usually are pre-lubricated with grease.
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	Solid Lubrication		Solid lubricants can be used in a vacuum, in high and low temperature applications and where oil or grease may be unsuitable. Solid lubrication bearings feature excellent oil retention and long lubrication life.
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Angular Contact Bearings Specifications

Bearing Design:

Thin-section?

Ball Screw Support?

Flanged?

Bore:

Outside Diameter:

Outer Ring Width:

Rated Speed (Oil):

Static Radial Load:

Dynamic Radial Load:

Bearing Class:

Stainless Steel?

Plastic?

Ceramic Balls?

Plated?

Seals / Shielding:

Relubricatable?

Prelubricated?

Solid Lubrication?

Help with Angular Contact Bearings specifications: