SNR High Precision bearings and precision nuts

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Products that meet your expectations

- TOPLINE bearings for extreme use - MachLine high precision bearings - Premier spherical roller bearings - Maintenance products

- Services

The answers to your technical questions

Prefixes / suffixes definition - Interchange

- SNR prefixes / suffixes definition

- Competitor prefixes and suffixes and SNR equivalent

SNR bearings

Standard and special bearings

- Bore size classification P 75 - P/N’s classification (alphanumerical) P 106

Insert bearings for self-aligning bearing units

- P/N’s classification (alphanumerical) P 178

SNR High Precision bearings and precision nuts

SNR pillow blocks and other products

Pillow blocks Other products

- Sleeves - Nuts - Washers - Balls

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The SNR Group

Bearing designer and manufacturer for almost a century, SNR is a major world-renowned actor and the partner of the leaders in the Automotive, Industry and Aerospace thanks to a thorough supply of highly technological products and exclusive services.

In addition to its 5 factories, SNR group has production sites in Germany, Italy, Romania, Brazil and in the USA and is represented in over 200 countries through its subsidiaries that ensure our bearing marketing.

Every year, SNR devotes over 5% of its sales turnover in Research &

Development. This policy is dictated by our Innovation and Quality culture.

Employee expertise is a major benefit of the SNR offer. Specialist teams, dedicated to training and maintenance, are focused on product quality and a permanent quest for efficiency and service with regards to our clients.

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@

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SNR Industry

proposes a wide range of standard bearings (ball bearings, tapered, cylindrical and spherical roller bearings), high precision bearings, bearing units and housings, maintenance products. This catalogue comprises the complete lists of our range of standard and special bearings. It will also be useful to find elementary technical information.

The updated list of our products is also available online on the SNR Industry website www.snr-bearings.com/catalogue in the

“Catalogue industry“ section. You will find the complete features and the main applications of our products. In addition, our online order site will help you to check our product availability or place your express orders in a few clicks, 7 days a week, 24 hours a day.

To benefit from this service, please connect to our website and send us your request by the means of the contact form or contact your usual SNR interlocutor directly.

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Products that meet your expectations

Range Typical applications Characteristics

• High temperatures:

FT150 series: 150°C (300°F) Up to 500000 N.Dm,

• HT200 series: 200°C (400°F) Up to 150,000 N.Dm,

• Low temperatures:

LT series: down to -60°C (-75°F),

• High speeds:

HV series: up to 700,000 N.Dm.

• Electric motors, pumps, capacitors, industrial fans, alternators, Ceramic industry, steel mills, naval engines, textile industry, freezing appliances …

• Optimized internal design,

• Heat treatment adapted to different uses,

• Special grease,

• Protection by waterproof seals or metal deflector,

• Tightened tolerances for the HV series, high precision bearings (DIN P6 or ISO6 standard).

*TOPLINE bearings applications:

•FT150 & FT150ZZ: Electric motors, capacitors, fans and et compressors, ovens, pumps, photocopiers, food and pharmaceutical industries…

•HT200 & HT200ZZ: Iron and steel, ceramic, food processing and, paper mill industries, industrial fans…

•HV ZZ: Textile industry, groove shapers for wood cabinets, naval engines, food can industry, alternators, wood machine-tool spindles and electric spindles…

•LT & LT ZZ: Ski resort equipment (compressors), freezing appliances for food processing industry, gas production, fork-lift trucks for cold rooms…

TOPLINE ball bearings for extreme use - Available from

stock.

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TOPLINE ball bearings F600, F604 for very high temperature.

Avantages Characteristics Operating Typical Range

conditions applications

• All the advantages of standard bearings plus an internal design specially adapted to accomodate very high temperatures.

• Pressed steel cage,

• Radial clearance adapted to the temperature,

• Steel material with stress-relief tempering,

• Phosphate treatment and molybdenum disulphide coating of the active surfaces to improve the lubrication,

• Shields and lubrication (high- temperature lubricating compound) for version F604.

• Earthenware works, glass industry, steel mills, foundries cement mills, brick-works, kiln cars, conveyor rollers in severe thermal environments (bread baking conveyors, etc.).

• Conrad type, single-row ball bearings series 6000, 6200, 6300,

• Variation with lubrication and two integrated shields ZZ (suffix F604):

Contact your SNR representative.

• Continuous or intermittent operating temperature up to 350°C (660°F) at low speeds (less than 50 rpm) and under light loads.

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MachLine high precision bearings for machine-tool spindles

Products that meet your expectations

SNR collaborates with the biggest aeronautic and aerospace programs (Ariane 5 rocket, A380 passenger plane...). Thanks to this experience and to the

competencies acquired in these domains where high constraints and high precision requirements are met, our engineers now have a solid expertise. This expertise has enabled SNR to become a significant actor in the manufacturing of high precision bearing and to develop the MachLine range, a range of excellence for machine-tools.

The different series of this range offer a wide variety of executions and give you the best compromise to answer the most precise needs:

• High precision:

- Manufacturing precision “P4S“ is standard, excellent compromise between performance parameters, speed, rigidity, load capacity and precision.

• High speed (ML):

- Manufacturing precision “P4S“ is standard, optimized track geometry, low heating and limit speed increased (+20%).

• Sealed (MLE):

- Manufacturing precision “P4S“ is standard, non-contact nitrile rubber seals, which does not reduce the bearing limiting speed.

• Hybrids (CH) - all series are available in hybrid version:

- Reduced operating temperature, increased speed capability, rigidity and service life increased.

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Advantages Characteristics Operating Typical Range conditions applications

• Very high rotation precision,

• Shorter machining times,

• Quality control:

- high rotating accuracy

- low temperature rise

- high rigidity,

• Reduced maintenance cost,

• Good load carrying capacity, resulting in an increased service life.

• P4S and ISO2 precision,

• 17° and 25°

Contact angle,

• Phenolic resin laminated cage (other on demand),

• Universal bearings, Set of universal bearings,

Set of paired bearings

• MLE: nitrile seal without contact.

• Machine-tool spindles up to 2.2 millions Ndm (and up to +30% with ceramic balls),

• Spindle with sealed bearings lubricated with grease.

• Angular contact ball bearing series 71900, 7000 and 7200,

• ML and MLE:

71900 et 7000 series,

• Bearings with ceramic balls.

• Any application requiring a very high rotating accuracy, rigidity and speed.

MachLine high precision bearings for machine-tool spindles

Self-locking precision nuts

The self-locking precision nuts are assembly accessories that must be used in cases such as the following:

• When a preloading of the bearings package is required to guarantee the maintenance of the preloading time-value.

•When a high precision bearing assembly is being used, since this requires the use of accessories which will maintain the precision level of the equipment as a whole.

•When the setting of the position of the bearings package must be reliable and long- lasting, even when it is not preloaded (especially if the presence of significant axial efforts is foreseen during the operation of the equipment).

Overall, this type of nuts is used with angular contact ball bearings (whether high precision or not), with cone bearings or with combined needle bearings. The thread and the flat side of the nut which lean against the bearing are built in the same fixation by which a high precision perpendicularity is obtained: 0.005 millimetre tolerance.

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Advantages Characteristics Operating Typical Range conditions applications

Spherical roller bearings series EA / EAK

• Pressed steel cage used as a standard feature for the whole range,

• Steel stabilized for operating,

temperature up to 200°C (390°F).

• Phosphate-coated, window-type pressed steel cage,

• Relubrication groove and holes (W33).

• Paper mill,

• Agricultural and textile equipment,

• General mechanical industry,

• Wood working machines,

• Handling and public works, etc.

• Standard, even for operating temperatures exceeding 150°C (300°F).

Premier: SNR high performance standard

Started with spherical roller bearings, the "Premier" approach consists of developing standardised bearings with high-level performance, endurance and longevity features as a standard. Symbol of the quality of our brand as a standard product, "Premier" creates a strong identity and demonstrates the desire of SNR to offer consistent value for the most common applications.

The 4 keys of the Premier approach

To become "Premier", our standard bearings must meet strict requirements in 4 fields which determine their reliability and their life:

- A thorough control of steel: less wear, less damage, more stability at high temperature.

- Design: compactness and load capacity, the result of SNR experience, - Sealing lubrication: important elements in the design,

- Bearing Finish: quality assurance in production and continuous improvement activity on machines and processes.

Spherical roller bearings: First Premier

SNR spherical roller bearings were the first to benefit from the Premier system. The tests carried out on these new products showed very significant gains: + 18% for the load capacity, + 75% minimum life duration. The "Premier" brand name is clearly visible on the specific packaging created for the launching of the range. The bearing itself bears a specific marking. In addition, to fight against counterfeits, all SNR standard bearings benefit from a new holographic label comprising several safety levels. These multiple identifications express the difference between SNR "standards" and products without any guarantee. Gradually, the Premier specification will be applied to all the brand's bearings.

Products that meet your expectations

• Series 22200 22300 23000 23100 23200 24000.

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Spherical roller bearings series EM / EMK

Advantages Characteristics Operating Typical Range

• Better resistance to impacts and vibration: one-piece solid cage (no floating flange), minimum resonance,

• Steel stabilized for operating temperature up to 200°C (390°F).

• One-piece solid brass cage centered on rollers,

• Paper mill,

• Cement mill:

shakes screens,

• Flour mill,

• Bearing units for heat treatment furnaces, etc.

• Series 22200 22300 23000 23100 23200

• High resistance to impacts and vibration.

Spherical roller bearings series EF800 / EKF800

• Better resistance to impacts and vibration (one-piece solid cage),

• More accurate clearance,

• Optimum service life thanks to reduced manufacturing tolerances,

• Steel stabilized for operating temperature up to 200°C (390°F).

• One-piece solid brass cage centered on rollers,

• C4,

• Closer tolerances applicable to internal clearance, bore and outside diameter,

• Inner ring with lateral shoulders,

• Quarries, grinders, crushers, screens

• Textile industry,

• Chemical industry,

• Flour mill,

• Sugar mill, etc.

• Series 22300,

• Other series:

please contact SNR.

• Severe operating conditions:

unbalanced loads, vibration, impacts.

Spherical roller bearings series EG15 / EG15K

• Benefit offered by the polyamide cage:

- better resistance at high speed and during acceleration thanks to the cage elasticity and flexibility

- low noise level:

reduced resonance.

• Cage made of fiber-reinforced polyamide 6/6,

• Same as above but only for operating temperatures up to 120°C (250°F).

• Series 22200 22300

• Standard for temperatures up to 120°C (250°F).

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Products that meet your expectations

Maintenance products

SNR LUB greases

Advantages Description Operating Applications

conditions

• Reliable: developed and made by a bearing, manufacturer and approved petroleum suppliers,

• Adapted to the needs:

- different types as per applications

- packaging method adapted to the types of grease.

• NLGI2 grade for all greases,

• Operating temperature between -50°C to +250°C according to type,

• Very good resistance to water and corrosion.

Range adapted to following applications:

• Multiservice MS,

• Extreme pressure EP,

• High speed GV,

• High viscosity FV,

• Low speed, extreme pressure VX,

• High temperature HT,

• Very high temperature THT,

• Food compatible grease AL1.

• All types of bearings, pillow blocks and mounted units as per load and environmental requirements.

SNR automatic lubricator

conditions

• Safe: inert gas produced within a sealed chamber,

• Cerchar and Ineris approvals: electrical equipment usable in an explosive atmosphere,

• Reliable lubrication: not readily accessible or dangerous areas,

• Automatic: less frequent monitoring,

• Flowrate adjustment: one product for all applications,

• Sealed: operation possible when immersed.

• Flowrate programmable via switches,

• Can be stopped during operation (ON/OFF),

• Pressure: 3 bar (43 psi) maximum,

• Volume: 125 cm³(4.2 ozfl),

• Different types of grease can be used.

• Direct installation on the component to be lubricated,

• Remote installation (1 m or 3 ft away) in case of excessive temperature, uneasy access or vibration,

• Range of lubricators AL1

EP HT MS VX

• All types of machines regardless of the environment.

Grease gun for bearings

conditions

• Robust: entirely made of steel,

• Practical use: knurled body for an excellent grip, the pump can be actuated with one hand,

• Precise: especially designed SNR union combined to a special profile greasing nozzle to inject the grease at the right point,

• Clean: closed circuit, clean for the environment and the user.

• Material: heavy steel plate,

• Weight: 2-1/2 pounds with steep section and clip,

• Content: 500cm³,

• Operating pressure:

180bars,

• Maximum pressure:

360bars,

• Flow rate: 0.80cm³,

• Greasing accessories supplied with the gun.

• Maintenance operations (greasing, regreasing).

• For all bearings.

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Induction heaters

(Fast Therm 20/35/150/300/600/1000)

conditions

• Easy to use: pivot arm, operator’s safety, cleanliness,

• Heating control and safety:

temperature control,

• Efficiency: turbo-boost technology that heats the part twice as rapidly.

• 6 devices range,

• Automatic demagnetizing on completion of the cycle.

• All circular parts with a maximum bore diameter from 215 to 1150mm.

• Steel ring bearings, gears etc. with tightered adjustment on the shaft.

Heat-insulating gloves

conditions

• Non-flammable,

resistance to temperatures up to 350°C / 660°F,

• High protection: arm + hand (glove length: 35cm / 14 inches,

• Very high resistance to cuts, tears and abrasion.

• Made of Kevlar,

• Certified for EN388 mechanical and EN407 thermal risks.

- • Handle of oily, hot

bearings.

Installation kit

conditions

• Do not deteriorate the bearings during installation,

• Practical, thorough transportable kit.

• 3 impact tubes,

• 1 set of 33 impact rings,

• 1 special hammer, anti- bounce, shot-loaded, to ensure maximum impact.

-

• Bearings (bore diameter from 10 to 55 mm), spacer rings, pulleys and seals installation.

Spanner wrenches

conditions

• Solid, safe, simple to use.

• 5 sizes to cover all needs,

• Capacity: 15 to 180 mm,

• Pins are heat-treated to 40 HRc Rockwell hardness.

• 2 types of wrenches available: pin wrenches to tighten drilled nuts (e.g.

precision nuts) and castellated wrenches to tighten nuts with straight lots (or castellated nuts).

• 5 sizes: 15-35 mm ; 35-50 mm ; 50-80 mm ; 80-120 mm ;120-180 mm.

• Tightening and removal operations for standard and precision nuts.

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Calibrated feeler gauges

conditions

• High precision measurement,

• Set of gauges protected by a steel frame.

• Set of 18 gauges, round tip.

• Calibrated to 1/100th,

• 2 lengths available:

90x10mm et 150x10mm.

• Control of bearings fit,

• 2 sets available (+1 en inch).

• Internal radial clearance measurement in spherical and cylindrical roller bearings.

Laser-targeting thermometer

conditions

• Simple to use,

• Precise.

• Non-contact infrared measurement,

• Emissivity adjustment 0.20 to 1.00,

• °C/°F switching.

• Functional monitoring. • Bearings, plain bearings, lubrication systems, surface temperature, Live components…

Products that meet your expectations

Maintenance products

Fitting compound

conditions

• Contact corrosion reduction,

• Extended shaft and bearing housing life,

• Water and washout resistant,

• Stick-slip reduction.

• Composition: lithium soap, synthetic oil, solid organic lubricants,

• Operating temperature: - 45°C to 150°C,

• NLGI grade: 1.

- • Installation or

removal by fitting (bearings, wheels, flanges...).

Hydraulic extractor

conditions

• Simple thanks to its integrated hydraulic pump,

• Solid, robust,

• No energy loss.

• 2 or 3 interchangeable jaws,

• Light weight,

• Extraction force: 10 tons.

• Always position the protection cover over the jaws when using the extractor.

• Removal of bearing assemblies,

• Removal of bearings either by the bore or by the outer diameter, by reversing the jaws.

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Products that meet your expectations

Maintenance products Products that meet your expectations

SNR Industry services

• Expertise

If your bearing is damaged or operates incorrectly, our experts are at your disposal to analyse the incriminated bearing. They can be seconded to your site as required.

In case of premature bearing damage, the bearing state will provide significant information. Therefore, send the bearing to SNR Annecy without cleaning it, and mandatorily accompanied with analysis request sheet, duly completed (available from your SNR contact or distributor). Please provide maximum information concerning bearing operation and environment.

SNR experts ensure on-site presence, everywhere in the world. Their interventions are quick and well targeted to help our clients solve potential or actual problems.

• Installation / Removal

Our experts can intervene on-site, everywhere in the world and on short notice. Their mission consists of providing suitable consulting advice for bearing installation and removal to ensure optimum service life. Therefore, this service is effective at all collaboration stages between SNR and its clients, before and after sales, and also during the bearing service life. If you do not possess suitable means, or if you lack the time or availability, SNR is there to help you.

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• Shaft alignment

Misalignment entails stress loading and vibrations that give rise to premature deterioration of bearings, and also coupling, packing and sealing, etc. Abnormal stress loading associated with misalignment also entails increased energy consumption. Misalignment has a direct impact on maintenance costs and the availability of your production tool. By entrusting your shaft alignment operations to the teams of SNR experts, you will guarantee the precision of alignment and will ensure the quality of your rotating machines elements.

• Vibration analysis

Vibration analysis is the most commonly used on-condition maintenance method for rotating machines, which are essential elements at the heart of the manufacturing process. Measurements on operating machines are easy to implement and the process allows early detection of most faults encountered on production machines. Many anomalies such as shaft line unbalance play, misalignment of coupled machines, coupling deterioration, plays, bearing wear, or even electrical faults can be detected with sufficient anticipation to plan an intervention before failure.

SNR has developed a whole range of measuring and monitoring instruments in order to accurately analyse all environmental constraints likely to affect correct operation of your facilities and, notably, your bearings.

In order to detect weak points in your equipment and facilities and solve them, we also propose a range of products and services, suitable for vibration monitoring of the rotating machines, together with our partner, 01dB Acoustics and Vibration, a renowned expert in this field.

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The answers to your technical questions The bearings

A General data

1 Vocabulary and basic knowledge P 18

1.1 Function P 18

1.2 Vocabulary P 18

2 Standardization P 18

2.1 Dimensional standards P 18

2.2 Examples of dimensional interchangeability P 19

2.3 ISO standards P 19

2.4 List of existing ISO standards P 19

B The bearing

1 Different types and capabilities of bearings P 20

1.1 Types of bearings P 20

1.2 Predominant loads and bearings groups P 20

1.3 General bearing designation P 21

1.4 Tapered roller bearing designation P 23

1.5 High-precision bearing designation P 24

1.6 General capabilities of bearing types P 25

2 The cages P 26

2.1 Their intended purpose P 26

2.2 Main types and properties of cages P 26

3 Shields and seals P 27

3.1 Guide for selecting the type of sealing P 27

4 Bearing precision and tolerances P 27

5 Clearance and fit P 28

5.1 Initial clearance P 28

5.2 Residual clearance after fitting P 30

5.3 Operating clearance P 30

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C Fitting the bearings

1 Bearing radial retention rules and fit requirements P 31

1.1 Definition P 31

1.2 Radial retention rules and recommended fits P 31

2 Standardized bearing fits (Normal Class) P 32

Fit tables P 32-35

3 Fitting/Removal P 36

3.1 Fitting P 36

3.1.1 General rules P 36

3.1.2 Importance of Cleanliness during Handling P 36

3.1.3 Cold fitting P 36

3.1.4 Hot fitting P 37

3.1.5 Fitting with adapter sleeve P 38

3.2 Removal P 39

3.2.1 Bearings Press-Fitted to the Shaft P 39

3.2.2 Bearings Press-Fitted into the Housing P 39

3.2.3 Bearings Press-Fitted on the Shaft and into the Housing P 39

3.2.4 Use of a knife extractor P 40

3.2.5 Tapered-bore bearings P 40

D Bearing life

1 Bearing spalling P 41

2 Life calculation P 41

E Bearing lubrication

1 The SNR ROULEMENTS Expertise P 42

2 Oil or grease lubrication P 42

2.1 Applications P 42

2.2 Advantages P 42

3 Selection of lubricant P 42

3.1 Determination of oil viscosity or grease basic oil viscosity P 42-43

3.2 Grease Selection and characteristics P 44-47

4 Quantity of lubricant required for initial lubrication P 48

4.1 Quantity of grease P 48

5 SNR automatic lubricator P 48

5.1 Advantages P 48

5.2 Fitting accessories P 48

5.3 Flow rate adjustment parameters P 48

6 Relubrication P 49

6.1 Relubrication frequency P 49

6.2 Quantity of grease to add at regular intervals P 50

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F Failure and damage

1 Introduction P 51

2 Typical external causes of bearing failures and their origins P 51

3 Characteristics of main bearing failures P 52-53

4 Bearing malfunction diagnosis P 54

4.1 Precautions to take when making a diagnosis P 54

4.2 Corrective action P 54

4.3 For further information P 55

5 Predictive maintenance P 55

G Housed bearings

1 Use of housed bearings P 56

2 Types of housed bearings P 56

3 SNU cast-iron pillow blocks in two parts P 56

3.1 Description P 56

3.2 Associated bearing series P 56

3.3 Interchangeability P 56

3.4 Mechanical strength P 57

3.5 Seal selection guide P 58

3.5.1 Speed and temperature P 58

3.5.2 Permissible misalignment P 58

3.5.3 Other constraints P 58

3.6 Assembly P 58

3.7 Disassembly (replacement of bearings) P 59

3.8 Lubrication P 59

4 Self-aligning bearing units P 60

4.1 Description P 60-62

H Storage

1 Packaging P 63

2 Storage conditions P 63

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18

Standardized boundary dimensions

All types of bearings except tapered roller and

thrust bearings

Tapered roller bearings

Thrust bearings r

r

D d

B

B C

D d

T

D d

General data

1 Vocabulary and basic knowledge

1.1 Function

A bearing is a mechanical unit that provides a mobile link between two parts which rotate in relation to each other in a mechanism.

Its function is to permit relative rotation of these parts, under load, with accuracy and minimum friction.

1.2 Vocabulary

The housing is the mounting location of the bearing outer ring.

The shaft is the component that fits into the inner ring.

The pitch diameter is the diameter of a fictitious circle passing through the center of the rolling elements.

To facilitate computation, it is often replaced by the average diameter (d+D)/2.

2 Standardization

Due to their universal use, bearings must be interchangeable with respect to their dimensions, accuracy, radial internal clearance and other characteristics.

2.1 Dimensional standards

A

d = Bore D = Diameter B = Width

C = Outer ring width T = Overall bearing width r = Corner radius

α = Contact angle

Outside diameter Outer ring Inner ring Shaft

Rolling elements Inside diameter (bore)

Pitch diameter Cage (or retainer) Housing

Inner ring Outer ring

(cone) (cup)

Raceway Washers

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19 2.2 Examples of dimensional interchangeability

When designing a component, several types of bearings can be used in the dedicated space. Some examples of dimensional interchangeability are given hereafter.

CAUTION: To select the correct bearing, it is also necessary to ensure its functional interchangeability (speed, load, etc.).

Note: Special bearings whose dimensions are not standardized are designated by symbols which are specific to SNR ROULEMENTS.

2.3 ISO Standards

These standards are established by the International Standard Organization (ISO) whose mission is to develop and coordinate standards to facilitate the trade of products and services throughout the world. The ISO encompasses the national standard Committees of 89 countries (AFNOR-France, DIN-Germany, UNI-Italy, BS-Great Britain, ANSI-United States of America, etc.).

2.4 List of existing ISO standards

Total interchangeability: width, bore and outside diameter Bore and outside diameter interchangeability

4206 6206 32206 22206

6206 7206 NU206 30206

Vocabulary ISO 5593

Dimensions

Ball and roller bearings

(except tapered roller and thrust bearings) ISO 15

Tapered roller bearings ISO 355

Self-aligning mounted unit bearings ISO 2264

Thrust bearings ISO 104

Snap ring grooves ISO 464

Snap rings ISO 464

Eccentric locking collars ISO 3145

Tapered sleeves ISO 113/1

Nuts and lockwashers ISO 2982

Pillow blocks ISO 113/2

Self-aligning mounted units ISO 3228

Corner radii ISO 582

Precisions

Definitions ISO 1132

All types of bearings ISO 492

Thrust bearings ISO 199

Clearance

Radial internal clearance ISO 5753

Load ratings

Basic dynamic load rating and bearing life ISO 281

Basic static load rating ISO 76

Characteristics ISO standards