Miniature Bearings and Instrument Bearings Specifications

Help with Miniature Bearings and Instrument Bearings specifications:

Bearing Design


	Ball Bearing Types:
	Your choices are...
	Radial Ball Bearing Courtesy of Timken Super Precision		Radial, or deep groove bearings, can take radial and axial loads to varying degrees but are used when the primary load is in the radial direction. They consist of an inner ring, an outer ring, balls and sometimes a cage to contain and separate the balls.
	Angular Contact Ball Bearing Courtesy of Timken Super Precision		Angular contact bearings are designed such that a contact angle between the races and the balls is formed when the bearing is in use. The major design characteristic of this type of bearing is that one or both of the ring races have one shoulder higher than the other. In order for these bearings to function properly, they must be assembled with a thrust load. This loading (or preload) creates a line of contact (or contact angle) between the inner race, the ball and the outer race. The preload can be built in to the bearing or created when the bearing is inserted into an assembly. The contact angle varies from 15° to 40° and is measured relative to a line running perpendicular to the bearing axis. Angular contact bearings are one-directional thrust bearings that can withstand heavy thrust loads and moderate radial loads.
	Thrust Bearing Courtesy of Timken Super Precision		Thrust ball bearings are designed for pure thrust loads. These bearings can handle little or no radial loads. The rolling element can be a ball, needle or roller.
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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

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 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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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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	Ceramic Races		Bearing races are constructed of ceramic (typically Si₃N₄^).
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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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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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Features


	Flanged Courtesy of Timken Super Precision		The bearing has a flange for mounting or locating.
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