Radial Ball Bearings Specifications

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Bearing Design


	Bearing Design:
	Your choices are...
	Conrad / Deep Groove Courtesy of Timken Super Precision		The balls rotate in a deep groove machined into the inner and outer races. A cage maintains ball clearance and complement. This type of bearing exhibits a good radial load capacity, a fair axial load capacity and a fair capability to resist misalignment.
	Double Row Deep Groove Courtesy of CCTY Bearing		This bearing style is a modified version of the single-row deep groove ball bearing with the addition of a second row of balls. This design increases its ability to carry radial and thrust loads. Though using the same radial mounting space as the single-row style, its increased width limits the ability of this bearing to accommodate misalignment.
	Mast Guide Bearing		Mast guide bearings are heavy-duty bearings designed for use in forklift applications.
	Maximum Capacity Courtesy of Timken Super Precision		Maximum capacity bearings have a higher load capacity than the Conrad type but diminished thrust capacity. These bearings have no cage to separate the balls. A filling slot is used to load as many balls as possible.
	Maximum Capacity, Double Row		This bearing style is a modified version of the maximum-capacity single-row ball bearing, with the addition of a second row of balls. Maximum-capacity double-row bearings have a higher radial and thrust load capacity than single-row maximum-capacity bearings. These bearings have no cage to separate the balls. A filling slot is used to load as many balls as possible.
	Insert Bearing / Wide Inner Ring Courtesy of CCTY Bearing		Insert bearings, or wide inner ring bearings, are used for mounting on shafts without the need for shoulders, locknuts or adapters. The bearing is locked in place through setscrews or a locking collar. They are also referred to as insert bearings. The inner ring usually extends on both sides of the bearing to provide extra shaft support.
	Internal Self Aligning Courtesy of CCTY Bearing		A spherically-ground raceway on the bore of the outer ring allows for some limited misalignment.
	External Self Aligning		Spherical outside diameter on outer ring mates with a ring that has a spherically-ground internal surface, allowing for limited misalignment.
	Counterbored		Counterbored bearings have one side of one of the raceways (normally the outer ring) removed to facilitate the assembly of a greater number of balls. They are widely used in small motors. Separable inner and outer races. Sometimes called magneto bearings.
	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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Dimensions

Design Units:

Unit designation for O.D., I.D., etc.

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Inch

Units are inches or fractions of an inch.

Metric

Units such as millimeters or centimeters.

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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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Overall Width

Enter the overall width of the bearing or bearing assembly, including the locking collar (if present).

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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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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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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).

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.

Other

Other, unlisted quality rating.

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Tables:

Bearing Standard		Tolerance Class					Bearing Types
ABMA ANSI	ABMA/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)
	ABMA/ANSI Std. 19.1	Class K	Class N	Class C	Class B	Class A	Tapered roller bearings (Metric series)
	ANS B3.19 ABMA Std. 19	Class 4	Class 2	Class 3	Class 0	Class 00	Tapered roller bearings (Inch series)
	ABMA/ANSI Std. 12.1	--	Class 3P	Class 5P Class 5T	Class 7P Class 7T	Class 9P	Precision instrument ball bearings (Metric series)
	ABMA/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
ABMA - American 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 Race Material / Plating Options


	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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	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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	Plated		Bearing is plated; common plating materials are cadmium and chrome.
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Features


	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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	Hex Bore?		Bearing has a hexagon-shaped bore.
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	Tapered Bore?		Bearing has a tapered bore.
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	Flanged		The bearing has a flange for mounting or locating.
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	Snap Ring / Snap Ring Groove		Used to provide a locating shoulder when mounting bearing.
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	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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Radial Ball Bearings Specifications

Bearing Design:

Thin-section?

Design Units:

Bore:

Outside Diameter:

Overall Width:

Rated Speed (Oil):

Static Radial Load:

Dynamic Radial Load:

Seals / Shielding:

Bearing Class:

Ceramic Balls?

Stainless Steel?

Plastic?

Plated?

Solid Lubrication?

Hex Bore?

Tapered Bore?

Flanged?

Snap Ring / Snap Ring Groove?

Spherical Outside Diameter?

Help with Radial Ball Bearings specifications: