International standards are usually valid for the main dimensions and running accuracy of rolling bearings. Unless specified otherwise, the tolerances for radial rolling bearings correspond to ISO 492:2014 and, for axial rolling bearings, to ISO 199:2014. Information on which bearings are supplied with which tolerances is provided in the relevant product chapters.

For drawn cup needle roller bearings with open ends HK, drawn cup needle roller bearings with closed end BK and aligning needle roller bearings PNA and RPNA, the chamfer dimensions deviate from DIN 620-6. The lower limit values for r are given in the product tables.

I have an 03 and am getting rear wheel bearing replaced for the second time since buying it 7 years ago. I’ve put about 65,000 miles on it since buying it. It cost around $350 then. Haven’t gotten an estimate yet for this time around.

Rolling bearings are not resistant to corrosion by water or agents con­taining alkalis or acids but are often exposed to these corrosion-inducing agents. In these applications, corrosion protection is therefore a decisive factor in achieving a long operating life of the bearings.

The suffix defines special designs and features ➤ Figure and ➤ Figure. The prefix and suffix describe other features of the bearing but are not standardised in all cases and may vary in use depending on the manufacturer.

In many cases, adequate operating life values are only achieved at high temperatures through the use of special greases. In these cases, it must also be checked whether seals made from especially heat-resistant materials must be used. The operating limit of normal contact seals is +100 °C.

Deviation of minimum circumscribed size of effective width (flanged outer ring assembled with a master inner subunit) from its nominal size

In addition to the standardised tolerance classes, super precision bearings are also produced to the tolerance classes P4S, SP and UP. These tolerances are listed in the relevant product descriptions.

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Deviation of minimum circumscribed size of effective width (outer ring assembled with a master inner subunit) from its nominal size

My 02 Explorer needs the same thing. Evidently this is a very common problem for this model year. Sounds like a safety hazard to me and I don’t understand why it is not being recalled. This may be the last Ford I buy.

Deviation of a minimum circumscribed size of inner ring width, between two opposite lines, in any longitudinal section which includes the inner ring bore axis, from its nominal size

In the dimension plans, one bearing bore is allocated several outside diameters and width dimensions. In this way, it is possible to design several bearings of the same type that, for the same bore, exhibit different load carrying capacities. The development of new bearing series and individual new rolling bearings in accordance with the dimension plans has considerable advantages for users and manufacturers.

The axial internal clearance sa is defined as the amount by which one bearing ring can be moved relative to the other, without load, along the bearing axis ➤ Figure.

The minimum and maximum values for the bearings are given in the table Limit values for chamfer dimensions to DIN 620-6 ➤ Table, ➤ Figure.

Tapered roller bearings can generally also be classified in the dimension plans to ISO 355 ➤ Figure. The dimension series are designated in these by a combination of three symbols, e. g. 3FE ➤ Figure.

Ceramic hybrid spindle bearings contain balls made from silicon nitride. These ceramic balls are substantially lighter than steel balls. The centrifugal forces and friction are significantly lower.

Minimum and maximum values for the bearings ➤ Figure and ➤ Table. The values in the table correspond to DIN 620-6. In the case of axial deep groove ball bearings, the tolerances for the chamfer dimensions are identical in both axial and radial directions.

These cages are made from metal, laminated fabric or plastic ➤ Figure. They can be identified from the bearing designation.

For all rolling bearings in the range from d = 20 mm to d = 480 mm (excluding double direction axial bearings), the bore code is formed by dividing the dimension of the bearing bore by 5.

Cage pockets, which are separated from each other by bars and are uniformly distributed around the circumference of the cage, maintain the spacing of the rolling elements relative to each other and ensure the distribution of load. In addition, the bars prevent sliding friction between adjacent rolling elements and guide the rolling elements parallel to the bearing axis in the load-free zone. In the case of cylindrical and needle roller bearings, they additionally prevent skewing of the rolling elements by guiding the rolling elements parallel to the bearing axis.

Cages made from glass fibre reinforced polyamide PA66 are suitable for continuous temperatures up to +120 °C. For higher operating temperatures, plastics such as PA46 or PEEK can be used.

Deviation of minimum circumscribed size of effective width (inner subunit assembled with a master outer ring) from its nominal size

➤ Figure describes as an example the structure of the designation for a metric tapered roller bearing (dimension series to ISO 355, designation to ISO 10317). The 3 indicates the contact angle range. The first letter (F in this case) indicates a diameter series. Each diameter series has a certain ratio D/d (outside diameter to bore diameter). The second letter (E in this case) indicates a width series. Each width series has a certain ratio of bearing width T to the height of the bearing cross-section. The addition of the letter T (for tapered roller bearing) at the start and a three-digit number at the end for the bearing bore diameter in mm (in this case 120) gives the complete designation of a tapered roller bearing (e. g. T3FE 120 ➤ Figure).

The dimensions which determine the installation space are standardised. Standardisation is not, however, applied to the internal dimensions, such as the size and quantity of the rolling elements for example. The main dimensions of metric rolling bearings are defined in the following ISO dimension plans:

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SKFbearing nomenclature

The intermediate sizes, such as bore diameter d = 22, 28 and d = 32 mm for example, are also given with an oblique as /22, /28 and /32.

From d ＞ 480 mm, the unencoded bore diameter is given with an oblique after the bearing series, e.g. 618/500 with bore diameter d = 500 mm.

The operating clearance is derived from the radial internal clearance and the change in the radial internal clearance as a result of interference fit and thermal influences in the mounted condition.

When using oil lubrication, additives in the oil can impair the cage operating life. Aged oil can also impair the cage operating life at high temperatures, so attention must be paid to compliance with the oil change intervals.

An operating temperature of +70 °C is regarded as a normal operating temperature. Further temperature data in the product descriptions must be observed.

Deviation of a mid-range size (out of two-point sizes) of central shaft washer bore diameter in any cross-section from its nominal size

I recently had my 2002 4WD Explorer in to the dealer’s shop for OLF and tire rotation. It had 72500 miles on it at the time. Anyways, the service manager called to say that my rear wheel bearings needed to be replaced. The estimate was $1300!! I asked him how bad it was and he said that the technician was surprised I hadn’t been complaining about the noise. Problem is, I don’t hear any noise! It seems to be fine. Any other symptoms I should be experiencing if they are really shot? Also, does the $1300 price tag sound reasonable? I’m going to get other opinions, but would appreciate having a ball park price that I should be paying. Thanks in advance.

For increased performance requirements, highly corrosion-resistant, nitrogen-alloyed martensitic HNS steels are available, such as Cronidur and Cronitect.

Deviation of a mid-range size (out of two-point sizes) of bore diameter at the theoretical small end of a tapered bore from its nominal size

5 digitbearing nomenclature

Range of mid-range sizes (out of two-point sizes) of bore diameter obtained from any cross-section of a cylindrical bore

In Germany, the bearing designations are standardised in DIN 623-1. These designations are also used in many other countries.

In the case of bearings that are separable and can be swivelled, such as tapered roller, spherical roller and some cylindrical roller bearings, cages prevent rolling elements from falling out of the bearing. The rolling element set and cage can thus be mounted and dismounted as a complete unit.

For certain bearing types, the bearing bores are stated directly or in an encoded form in accordance with DIN 623-1. Up to d ＜ 10 mm, the bearing bore diameter is specified in the dimension-specific part of the designation (basic designation) directly as a number indicating the diameter ➤ Figure.

Systems are free from Cr(VI), provide effective protection against corrosion and, as result, extend the useful life of Schaeffler components. In isolated cases, the dimensional changes brought about by the coating must be taken into account in a further processing operation.

Bearings that have the same standardised designation are interchangeable with each other. In the case of separable bearings, it cannot always be ensured that individual parts with the same origin can be interchanged with each other.

Bearing nomenclaturechart

Circular radial run-out of inner ring bore of assembled bearing with respect to datum, i.e. axis, established from the outer ring outside surface

The operating clearance value is dependent on the operating and installation conditions of the bearing. A larger operating clearance is, for example, necessary if heat is transferred via the shaft, the shaft undergoes deflection or if misalignment occurs. An operating clearance smaller than CN should only be used in special cases, for example in high precision bearing arrangements. Normal operating clearance is achieved with an internal clearance of CN or, for larger bearings, more usually C3 if the recommended shaft and housing tolerances are maintained.

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In principle, corrosion-resistant steels to ISO 683-17 can be used. These bearings have the prefix S. For higher requirements, it may be advisable to use the high performance steels Cronidur and Cronitect.

Thin anti-corrosion coating systems of 0,5 μm – 3 μm and 2 μm – 5 μm are available for bearing applications. Various Corrotect variants with coating thicknesses ＞ 5 μm also exist, which can be applied as necessary. The Corrotect coatings thus offer corrosion protection times – as a function of the coating variant and coating thickness – of ≧ 720 h against base metal corrosion (in accordance with DIN EN ISO 9227).

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The dimensional and running accuracy of rolling bearings corresponds to tolerance class Normal. For bearings with increased accuracy, the tolerances are restricted to values in the classes 6, 5, 4 and 2. Tolerance tables for the individual tolerance classes ➤ Table to ➤ Table.

The radial internal clearance can alter considerably if there is a substantial temperature differential between the inner and outer ring ➤ Equation.

The radial internal clearance groups are defined in DIN 620-4 and ISO 5753-1 and are described in DIN 620-4 by means of codes that comprise the capital letter C and a number. ISO 5753-1 designates the groups by the word "Group" and a number ➤ Figure and ➤ Table.

Schaeffler rolling bearings fulfil the requirements for fatigue strength, wear resistance, hardness, toughness and structural stability. The material used for the rings and rolling elements is generally a low-alloy, through hardening chromium steel of high purity. For bearings subjected to considerable shock loads and reversed bending stresses, case hardening steel is also used (supplied by agreement). The results of research as well as practical experience confirm that bearings made from the steel currently used as standard can achieve their endurance limit if loads are not excessively high and the lubrication and cleanliness conditions are favourable.

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For lower press-in forces, the surface of the parts should be lightly greased, the tolerances are increased by the thickness of the coating.

Range of minimum circumscribed sizes of inner ring width, between two opposite lines, obtained from any longitudinal section which includes the inner ring bore axis

Both steels are clearly superior to conventional corrosion-resistant steels for rolling bearings in terms of corrosion resistance and fatigue strength.

Circular axial run-out of inner ring face with respect to datum, i.e. axis, established from the inner ring bore surface

High temperatures are critical especially in the case of seals made from fluoro rubber (FKM, FPM, e. g. Viton®) or greases containing fluoride, such as the rolling bearing greases Arcanol TEMP200 and greases to GA11. If high temperatures are unavoidable, attention must be paid to the valid safety data sheet for the specific fluoride-containing material, which can be obtained upon request.

The designation for the bearing series comprises numbers and letters or letters and numbers. It indicates the type of bearing, the diameter series and, in many cases, the width series too ➤ Figure, ➤ Figure and ➤ Figure. The diameter and width series are described in ➤ section.

An extensive modular coating concept currently offers a wide range of surface improvements aimed at increasing the performance and rating life of bearing components. The “added value in the form of coatings” thus provided, is now established as a standard procedure for a wide variety of Schaeffler components.

Through the use of special bearings made from HNS (High Nitrogen Steel, supplied by agreement), it is possible to achieve adequate service life even under the most challenging conditions (high temperatures, moisture, contamination).

Circular axial run-out of outer ring flange back face of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface

The prefix normally identifies individual bearing parts of complete bearings (in certain cases, this may also be part of the basic designation) ➤ Figure and ➤ Figure.

Range of minimum circumscribed sizes of outer ring width, between two opposite lines, obtained from any longitudinal section which includes the outer ring outside surface axis

If the wheel bearings were really worn, you would hear them screeching as they ground around. You may even feel a slight wheel wobble/vibration.

In contrast to Cronidur, the more economical alternative Cronitect has nitrogen introduced into the structure by means of a surface layer hardening process.

For rolling bearings with a tapered bore, the standardised taper is 1:12. This corresponds to a half taper angle (α/2 = 2°23′9,4″); basic taper angle α = 4°46′18,8″. An exception is spherical roller bearings of the dimension series 40, 41 and 42 (the taper in this case is 1:30).

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In the load-free zone, the rolling elements are no longer driven by the inner or outer ring. As a result, they fall behind relative to the direction of rotation of the rings. Cages ensure that the spacing between the rolling elements is maintained, even in the load-free zone.

Rolling bearings are heat treated such that, depending on the bearing type, they are generally dimensionally stable up to +120 °C (certain bearings up to +150 °C). Operating temperatures above +150 °C require special heat treatment. Bearings treated in this way are available by agreement and are identified by the suffix S1, S2, S3 or S4 to DIN 623-1 ➤ Table.

Rolling bearing cages are subdivided into sheet metal and solid section cages. The cages are predominantly made from steel and, for some bearings, from brass ➤ Figure. In comparison with solid section cages made from metal, sheet metal cages are of lower mass. Since a sheet metal cage only fills a small proportion of the gap between the inner and outer ring, lubricant can easily reach the interior of the bearing and is held on the cage. In general, a sheet steel cage is only included in the bearing designation if it is not defined as a standard version of the bearing.

I just did a rear bearing on my 2002 Explorer. This is a press in bearing and a good shop around price for just the baring is about $140. Because this bearing is sealed and compact, the amount of internal grease is minimal. This can lead to failures much earlier than other wheel bearings. I just bought this vehicle with 90K and the rear wheel bearing had been replaced about 5K earlier. Improper installation caused the bearing to fail again. This car had a catastrophic bearing failure that destroyed the rear half axle, brake caliper, and E brake backing plate. You should be able to hear it before there is a real problem. Cost seems normal for dealer markup, but likely $500 cheaper at an indy.

My 02 explorer began making a grinding noise in the rear while on vacation. I just happened to be near a Goodyear repair shop. I took it there because I knew if the bearing went the tire could fly off at high way speeds. The total cost was just over $400.00. I called my mechanic near home and he said the repair bill is accurate. $1300 seems really high. If you haven’t repaired this yet don’t wait too long.

Range of minimum spherical sizes between the raceway and the opposite back face of the shaft washer, obtained from any longitudinal section which includes the shaft washer bore axis

The advantages of the special coating Corrotect are all-round corrosion protection, including the turned surfaces of chamfers and radii ➤ Figure. It also gives long-term prevention of rust penetration beneath seals and smaller bright spots are protected against corrosion by the cathodic protection effect. In comparison with uncoated parts, operating life is significantly increased by the corrosion protection. There is no decrease in load carrying capacity (such as occurs in the use of corrosion-resistant steels). It is therefore theoretically possible to replace uncoated bearings by coated bearings of the same dimensions. However, it is advisable to check the suitability for the specific application in advance since, for example, abrasion may occur. During storage, there is no need to use organic preservatives.

Unless Ford has changed their rear-end design, the rear bearings and seals cost around $50 per side with about one hour labor per side to change them. That’s $300 to replace them. But they almost NEVER need to be replaced. They operate at low speed and are well lubricated. You can check them yourself by jacking the wheel off the ground and try to move the wheel and the axle it’s bolted to. The axle may move in and out a LITTLE, but there should be no up, down, side to side play…

The radial internal clearance is reduced due to the fit as a result of expansion of the inner ring and contraction of the outer ring ➤ Equation.

Theoretical interference of the fitted parts with firm seating. The theoretical oversize of the fitted parts with a firm seating is determined from the mean deviations and the upper and lower deviations of the tolerance zones of the fitted parts reduced by 1/3 of their acceptable value. The amount of surface smoothing during assembly must be subtracted from this.

A further means of distinguishing between cages is their guidance method ➤ Figure. Most cages are guided by the rolling elements and do not have a suffix for the guidance method. If guidance is by the bearing outer ring, the suffix A is used. Cages that are guided on the inner ring have the suffix B.

Detailed information on the modular coating concept and individual coating systems can be found in Technical Product Information TPI 186 “Higher Performance Capacity Through the Use of Coatings”. This publication can be requested from Schaeffler.

Examples of the composition of designations on the basis of their definition in accordance with ➤ Figure are shown on ➤ Figure.

For very thin-walled housings and light metal housings, the reduction in the radial internal clearance must be determined by mounting trials.

Rollerbearing nomenclature

Symbols for nominal dimensions, characteristics and specification modifiers for axial rolling bearings in accordance with ISO 199:2014

58080 Sleeve Bearing, Bronze 1/2 X 5/8 X 1-1/8-Inch, 5-Pack · 2 Packs Cast Brass Sleeve Bearing Solid Friction, 1" OD 3/4" Bore 7/8" Length Cast Brass Self- ...

Width and diameter series are described using numbers. In the case of radial bearings in accordance with DIN 616 and ISO 15, these are as follows:

A larger radial internal clearance should be used for shafts running at high speeds, since adequate thermal compensation between the bearing, shaft and housing does not occur in this situation. ΔsT can, in this case, be significantly higher in this case than for continuous operation.

Circular axial run-out of outer ring face of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface

Under normal operating conditions, the cage design defined as the standard cage is generally suitable. Standard cages, which may differ within a bearing series according to the bearing size, are described in the product chapters. Under special operating conditions, a cage that is suitable for the specific conditions must be selected.

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For bearings without an inner ring, the enveloping circle Fw is used. This is the inner inscribed circle of the rolling elements in clearance-free contact with the outer raceway ➤ Figure.

If high temperature synthetic materials are used for seals and greases, it must be noted that the particularly high performance materials containing fluoride may give off harmful gases and vapours when heated to approx. +300 °C and above. This may occur, for example, if a welding torch is used in the dismantling of a bearing.

They are an expensive proposition as the entire bearing/assembly must be replaced. An independent shop could do this job for less I’m sure using aftermarket parts.

The permissible temperature for sealed bearings is dependent on the requirements for the operating life of the grease filling and on the action of the contact seals. Sealed bearings are greased with specially tested, high performance, high quality greases. These greases can withstand +120 °C for short periods. At or above continuous temperatures of +70 °C, a reduction in the operating life of standard greases with a lithium soap base must be expected.

The specific number of the width and diameter series, when combined, identifies the dimension series ➤ Table. When this table is used, for example, for a radial bearing of the width series 2 and the diameter series 3, this gives the dimension series 23 ➤ Table and ➤ Figure. If the bearing bore code is then added, ➤ section, the bearing size is completely defined.

The operating clearance is determined on a mounted bearing still warm from operation. It is defined as the amount by which the shaft can be moved in a radial direction from one extreme position to the other.

Range of minimum spherical sizes between the raceway and the opposite back face of the housing washer, obtained from any longitudinal section which includes the housing washer outside surface axis

Solid cages made from metal are used where there are requirements for high cage strength and at high temperatures. Solid cages are also used if the cage must be guided on ribs. Rib-guided cages for bearings running at high speeds are made in many cases from light materials, such as light metal or laminated fabric, in order to achieve low inertia forces.

Circular radial run-out of outer ring outside surface of assembled bearing with respect to datum, i.e. axis, established from the inner ring bore surface

The radial internal clearance applies to bearings with an inner ring and is determined on the unmounted bearing. It is defined as the amount by which the inner ring can be moved in a radial direction from one extreme position to the other in relation to the outer ring ➤ Figure.

The dimension plans are valid for different bearing types. Standard rolling bearings of different types can thus be manufactured to the same external dimensions. As a result, a designer working on the same design envelope can make a selection between bearings of several types with the same external dimensions.

With various bearing types, the radial internal clearance sr and the axial internal clearance sa are dependent on each other. Guide values for the correlation between radial and axial internal clearance are shown for some bearing types ➤ Table.

Usually bad bearings will either growl, rumble, and in some cases they may be quiet but the bearing/hub assembly has excessive play (looseness) in it. There usually is no adjustment on these and replacement is recommended if the play it outside the factory specs.

Deviation of a minimum circumscribed size of outer ring width, between two opposite lines, in any longitudinal section which includes the outer ring outside surface axis, from its nominal size

Deviation of a mid-range size (out of two-point sizes) of bore diameter at the theoretical large end of a tapered bore from its nominal size

Circular axial run-out of inner ring face of assembled bearing with respect to datum, i.e. axis, established from the outer ring outside surface

Deviation of a mid-range size (out of two-point sizes) of housing washer outside diameter in any cross-section from its nominal size

Ballbearing nomenclature

The calculation module BEARINX Shaft Calculation, which is available from Schaeffler free of charge, can be used to calculate and analyse the operating clearance.

Each rolling bearing has a designation that clearly indicates the type, dimensions, tolerances and internal clearance, if necessary with other important features.

My mechanic replaced the sealed front wheel bearings on my 2000 Blazer at 65k miles, the cost was ~$350 per bearing with labor the total cost was $800. I think the dealer price per bearing was between $450 and 500. My bearings went bad after I replaced the tires, for a while I thought the bearing noise was caused by the new tires. My mechanic picked up on it on the next oil change. One way to tell is if the noise changes pitch as the steering wheel is turned off-center (i.e. changing lanes).

Hybrid bearings allow very high speeds, even with grease lubrication, as well as long operating life and low operating temperatures.

Experience has shown that the predominant proportion of all bearing arrangement tasks can be fulfilled using bearings with standard dimensions, which are contained in ISO dimension plans.

Mine sounds like a tire going bad. Kind of a thump thump noise more pronounced at low to medium speeds. They have to drop the differential to do it. My independent mech. has quoted me 500 in labor alone. But hey at least my transmission hasn’t failed, Yet.

I would get another opinion, or two, with attention paid to bearing sideplay. (For what it’s worth, one of my daughter’s cars (Mitsubishi) has the same type of bearing/hub unit and has excessive play in both rear hubs with no noise. How long it’s been like that no one knows, but it’s going to get repaired in the near future. At this point, no problem). Hope that helps.

Bearing Nomenclaturepdf

Solid cages made from polyamide PA66 are produced using the injection moulding process ➤ Figure. As a result, cage types can generally be realised that allow designs with particularly high load carrying capacity. The elasticity and low mass of polyamide are favourable under shock type bearing loads, high accelerations and decelerations and tilting of the bearing rings in relation to each other. Polyamide cages have very good sliding and emergency running characteristics.

The high price does not mean you’re being ripped off. The dealer labor rate is usually higher (out of necessity) and the dealer cost on the Genuine Ford OEM parts is usually pretty high. Tack on the dealer markup and the price at the dealer could be in line.

Perpendicularity of outer ring outside surface axis with respect to datum established from the outer ring flange back face

Symbols for nominal dimensions, characteristics and specification modifiers for radial rolling bearings in accordance with ISO 492:2014

20168 168. : Lid Stay. : $0.00. : $0.00; . . : /. Default Title. 1.

Deviation of a mid-range size (out of two-point sizes) of shaft washer bore diameter in any cross-section from its nominal size

DIN 616 describes dimension plans for radial and axial bearings. An overview of ISO and DIN rolling bearing standards is given in DIN 611:2010-05.