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。SKF Cylindrical Roller Bearing， 110 mm ID， 200 mm OD - NU 222 ECM/C3 This cylindrical roller bearing from SKF is a smart choice for applications that need to accommodate heavy radial loads at high speeds。Its designed with open flanges， so it can transmit axial loads to some extent。This means it can handle accidental shaft displacements and misalignments。The bearings advanced surface profile design maximises efficiency by lowering friction and preventing heat damage and expansion。The logarithmic profile also reduces stress around the bearing edges stress， providing a long service life. High load capacity with high speed tolerance thanks to cylindrical roller bearing set-up Tapered bore support thrust and radial loads at the same time Compact size with a race width of 38 mm Application Information Engine rocker arms Gearboxes and transmission systems Construction equipmentSKF 大容量円筒ローラーベアリングは、総ころ軸受の高荷重容量と保持器付き軸受の高速容量を兼ね備えています。内径 110 mm、外径 200 mm です。 What type of cage does this bearing use ベアリングはスチール製です 円筒穴タイプThis bearing has a brass cage with a maximum operating temperature of +250℃， so it can tolerate a high amount of friction heat。Brass also resists corrosion， so its safe for use with most common bearing lubricants， including synthetic oils and greases， and can be cleaned using organic solvents。How do I mount this cylindrical roller bearing You can install this cylindrical bearing using the hot-mounting method.

。SKF Ball Bearing， 180 mm ID， 280 mm OD - 6036 M This ball bearing from SKF is a reliable choice for optimal performance under severe operating conditions。Its cage is made from machined brass， which is lightweight and provides more space within the bearing for lubrication。This gives the unit increased wear resistance， making for a longer working life。It also improves the bearings ability to handle shock loads and vibration， ensuring continuous and smooth rotational motion。This component is quiet during operation， making it suited for use in wind turbine generators and other demanding industrial applications. Open end， cylindrical bore type Inside diameter of 180 mm Outside diameter of 280 mm Race width of 46 mm Limiting speed of 4，000 r/min Application Information Wind power generation Automotive industry Medical and pharmaceutical industriesSKF 深溝ボールベアリングは、特に汎用性が高い製品です。高速及び超高速に適しており、両方向のラジアル荷重とアキシャル荷重に対応し、メンテナンスはほとんど必要ありません。深溝ボールベアリングは、最も広く使用されているベアリングタイプなので、SFKではさまざまなデザイン、タイプ、及びサイズを用意しています。内径 180 mm、外径 280 mm となっています。 How does this bearings cage design improve its performance ベアリングはスチール製です 円筒穴タイプThe cage pocket design of this bearing reduces contact stresses between the cage and rolling elements to optimise ball-to-cage contact and improve ball guidance。Plus， its no-edge contact promotes the formation of a hydrodynamic film， which significantly reduces vibration.

SKF Ball Bearing， 200 mm ID， 250 mm OD - 51140 M This hard-wearing thrust ball bearing from SKF is designed to reduce friction between a machines moving parts。Its made of bearing-type steel that provides long-lasting durability and corrosion resistance。A series of smooth balls in a band around a perimeter allow the bearing to support the axial thrust of both horizontal and vertical shafts。You can use it to control rotational motion and for functions like connecting a rotating shaft to a stationary motor. Limiting speed of 1900 revolutions per minute (r/min) to handle high-speed operations without failure Stabilised up to +125℃ to withstand the heat generated from constant rotation Low friction ensures minimal energy loss Small size for compact applications Good wear resistance for an extended life span Application Information Agricultural machinery Earth-moving equipment Pumps Industrial machinery for cleaning and bottlingSKF スラストボールベアリングは、単方向又はダブル方向のスラストボールベアリングとして製造されています。この製品は、軸方向の荷重にのみ対応するように設計されており、半径方向の荷重に晒さないでください。内径 200 mm、外径 250 mm です。 How does this thrust bearing work ベアリング材はベアリング鋼です 円筒穴タイプIt works by transferring thrust loads applied on the shaft and preventing the shaft from drifting in a horizontal or vertical direction。Thrust bearings are generally seated against a raised collar around the shaft。The thrust collar allows the axial load to be transferred from the shaft to the bearing。Thrust bearings are typically used in pairs on each side of the thrust collar.

SKF Roller Bearing， 100 mm ID， 215 mm OD - NU 2320 ECML/C3 This cylindrical roller bearing from SKF is ideal for handling low thrust and large radial loads at high speed。Its part of the upgraded SKF Explorer range and is capable of accommodating increased load levels and providing a significantly extended service life。Optimised internal geometry and an advanced surface finish reduces friction and wear， as well as enhancing lubricating conditions。This adds up to reduced noise and vibration and longer lubricant life to increase uptime and productivity。This bearing also provides reduced sensitivity to misalignment. Cylindrical bore type for high radial load capacity at high speeds Machined brass cage Compact structure Inside diameter of 100 mm Outside diameter of 215 mm Race width of 73 mm Application Information Mining industry Construction Wind turbines TransportSKF 大容量円筒ローラーベアリングは、総ころ軸受の高荷重容量と保持器付き軸受の高速容量を兼ね備えています。内径 100 mm、外径 215 mm です。 Whats the advantage of the brass cages on these bearings ベアリングはスチール製です 円筒穴タイプBrass cages are rigid and strong as well as being suitable for use at high temperatures。They are also capable of absorbing lubricant， helping them to continue to perform even when lubrication levels are reduced.

。SKF Spherical Roller Bearing， 120 mm ID， 215 OD - 23224 CC/C3W33 Use this SKF spherical roller bearing to support both radial and axial loads。It features a single outer raceway and two inner ring raceways inclined at an angle towards the bearings axis。This innovative design allows the product to support loads from both directions。The bearing has a deep groove， so it can handle high loads without generating excessive friction。The tapered cylindrical rollers， raceways and cage are all made from stainless steel， making this product strong and highly durable for reliable performance over a long lifespan. Twin tapered bore helps resist axial shock loads， misalignment and shaft deflection Spherical roller bearing type can support heavy radial loads Stainless-steel body material for corrosion resistance Race width of 76 mm for versatile application Application Information Renewable energy generation Mining and mineral processing Material handling Marine industry applicationsSKF 球面ローラーベアリングには、2 列の対称ローラー、共通スフィンベアリング外輪軌道、ベアリング軸に対して傾斜する 2 つの内輪軌道があります。外輪軌道の球の中心点は、ベアリング軸にあります。ずれやシャフトの偏向が発生しやすい用途で、非常に重いラジアル荷重とアキシャル荷重を処理することは、非常に困難な場合があります。SKF 球面ローラーベアリングが課題を解決します。高い負荷容量とずれに対応できる Ability で、メンテナンスコストを低減し、ベアリングのサービス寿命を延ばします。開放型と密閉型の両方の堅牢な球面ローラーベアリングを、幅広く提供しています。球面ころ軸受の用途例を以下に示します。 再生可能エネルギー、鉱業、鉱物加工、セメント、マテリアルハンドリング、紙パルプ、産業用トランスミッション、金属、及び海洋。 How accurately do I need to align the bearing ミスアライメントに対応します 高い積載荷重 長寿命 低摩擦 堅牢This bearing is designed to accommodate some initial misalignment and is capable of aligning itself over time。This will reduce both installation and overall maintenance time。What is the maximum speed this bearing can accommodate This bearing has a high limiting speed of 2800 revolutions per minute， so it will support equipment with very rapid rotation.

。SKF Ball Bearing， 140 mm ID， 190 mm OD - 61928 MA Make this SKF stainless-steel ball bearing your first choice for environments where moisture is present。It has reliable anti-corrosive properties and handles both radial and axial loads。It has a single-row， deep-groove construction， which reduces friction， meaning the bearing stays cool and lasts longer。Thanks to its machined brass cage， it offers high rigidity and strength， so its an effective choice for demanding environments。It keeps its dimensional stability and functions efficiently in temperatures up to +120℃. Easy to mount Low maintenance for reduced machine downtime Low noise levels and vibration， thanks to minimal friction levels High resistance to abrasive chemicals for an extended service life Application Information Chemical and hydrocarbon processing Medical equipment Printing industrySKF 深溝ボールベアリングは、特に汎用性が高い製品です。高速及び超高速に適しており、両方向のラジアル荷重とアキシャル荷重に対応し、メンテナンスはほとんど必要ありません。深溝ボールベアリングは、最も広く使用されているベアリングタイプなので、SFKではさまざまなデザイン、タイプ、及びサイズを用意しています。内径 140 mm、外径 190 mm です。 Where would I use this kind of ball bearing ベアリングはスチール製です 円筒穴タイプDeep-groove ball bearings are versatile components suited to machinery with rapidly rotating parts。Youll find them in heavy industry， for example in the energy sector。Why is a bearings cage material important A bearings cage is mechanically stressed during operation by friction， impact and centrifugal and inertial forces。It can also be affected by solvents， coolants and lubricants。This means that the material used for the cage can have an influence on the suitability of a bearing for a particular application.

。SKF Ball Bearing， 180 mm ID， 225 mm OD - 61836 This single-row， deep-groove ball bearing from SKF is suited to high rotational speeds in demanding industrial applications。Its slim design is space-saving and lightweight for optimal operating efficiency of the unit。Stainless steel construction makes the bearing extremely corrosion-resistant， so it wont rust in the presence of moisture and most chemicals。Its an open-end type and has no seals， which allows old lubricant to be easily flushed out as new grease is applied to the bearing. Cylindrical bore type Deep-groove design for low friction torque Low noise and vibration Race width of 22 mm Dynamic load rating of 62.4 kN Limiting speed of 3400 r/min Application Information Automotive industry Mining and mineral processing Printing Textile manufactureSKF スラストボールベアリングは、単方向又はダブル方向のスラストボールベアリングとして製造されています。この製品は、軸方向の荷重にのみ対応するように設計されており、半径方向の荷重に晒さないでください。内径 180 mm、外径 225 mm となっています。 What makes SKF ball bearings long-lasting ベアリングはスチール製です 円筒穴タイプThe internal geometry of the SKF range of deep-groove ball bearings has been optimised for improved seal attachment， low friction and increased ability to accommodate slight misalignments。All these elements reduce wear and tear on the bearings and improve their working life while maintaining reliability and precision.

SKF Ball Bearing， 190 mm ID， 260 mm OD - 61938 MA This SKF deep-groove ball bearing is designed to maintain low levels of friction， even when its working at high rotational speeds。This prevents it from overheating， improves power efficiency and means your machinery will have lower maintenance needs。It also leads to less wear and tear on the bearing itself， which improves its working life。True to SKFs high standards， this unit is engineered to offer precision operation and reliable performance in demanding working environments. Open end， cylindrical bore type Deep-groove design for low friction torque Low noise and vibration Inside diameter of 190 mm Outside diameter of 260 mm Race width of 33 mm Application Information Food and beverage industry Automotive manufacturing Wind power generation Mining and mineral industriesSKF 深溝ボールベアリングは、特に汎用性が高い製品です。高速及び超高速に適しており、両方向のラジアル荷重とアキシャル荷重に対応し、メンテナンスはほとんど必要ありません。深溝ボールベアリングは、最も広く使用されているベアリングタイプなので、SFKではさまざまなデザイン、タイプ、及びサイズを用意しています。内径 190 mm、外径 260 mm となっています。 What is this bearing made from ベアリングはスチール製です 円筒穴タイプThis SKF bearing is manufactured from steel with a machined brass cage。Both metals are extremely strong， while brass gives the unit a high temperature tolerance。This makes it suitable for use in hot environments and able to withstand the corrosive properties of water and abrasive chemicals.

SKF Deep Groove Ball Bearing - 6145 This popular choice of ball bearing is one of the most commonly used and versatile of bearings， suitable for a wealth of applications。Did you know that deep groove ball bearings can handle axial loads and radial loads in both directions Which can come in very handy for motors and household applications。The 6145 bearing has a basic dynamic load rating of 153 kN， a basic load rating of 114 kN and a fatigue load limit of 4.15 kN。Features & Benefits Very versatile and suitable for high and very high speeds Requires very little maintenance and is easy to mount Featuring a cylindrical type bore Low friction， optimised for low noise and low vibration which enables high rotational speeds Steel type bearing Single row Bore diameter is 75 mm whilst the outside diameter is 190 mm What types of deep groove ball bearings are there Single row ball bearings feature a single row of balls Double row ball bearings feature two rows of balls Deep groove bearings come with shielded， sealed or open-end typesSKF 深溝ボールベアリングは、特に汎用性が高くなっています。ボア径は 75 mm、外径は 190 mm です。高速及び超高速に適しており、両方向のラジアル荷重とアキシャル荷重に対応し、メンテナンスはほとんど必要ありません。深溝ボールベアリングは、最も広く使用されているベアリングタイプなので、SFKではさまざまなデザイン、タイプ、及びサイズを用意しています。1列 円筒形タイプの穴 スチールタイプベアリング

SKF Taper Roller Bearing， 160 mm ID， 240 mm OD - 32032 X Need a bearing solution to accommodate simultaneous axial and radial loads This taper roller bearing from SKF uses tapered rollers and raceways to do just that。It also reduces rotational friction and noise thanks to precision-engineered parts and an optimised design that lengthens its service life。Plus， thanks to a surface finish that promotes lubricant film formation， this unit is a durable choice。It has separable and interchangeable components， so its simple to perform maintenance and inspection。Adjust it against a second taper roller bearing and apply a preload for rigid bearing applications. Parallel bore type Compact structure Low maintenance， noise and vibration Inside diameter of 160 mm Outside diameter of 240 mm Race width of 51 mm Application Information Automotive production Agricultural industry Construction and mining applications Medical and pharmaceutical industriesSKF 単列テーパーローラーベアリングは、複合負荷に対応すると同時にラジアル荷重とアキシャル荷重を同時に作用するように設計されています。軌道の投影線がベアリング軸のコモンポイントに接触することで、本格的な転がり動作を実現し、動作中の摩擦モーメントが低くなります。先細ローラーベアリングの軸方向荷重伝達能力は、接点角 α の増加に伴って増加します。コンタクト角度のサイズ(通常は 10 ° → 30 ° )は、計算係数 e ( e の値が大きいほど、コンタクト角度が大きくなります)と関係があります。 How much maintenance does this taper roller bearing require 低摩擦 運用の信頼性の向上 ベアリングの剛性強化 通常、1 列先細ローラーベアリングは、2 番目の先細ローラーベアリングに対して調整されます。プリロードを適用することで、硬質ベアリングの用途を実現できます。 温度ピークが減少した実行イン期間 分離可能及び交換可能 内輪、ローラー、保持器アセンブリ(コーン)は、外輪(カップ)とは別に取り付けることができます。さらに、分離可能なコンポーネント(図6 )は交換可能です。これにより、取り付け・取り外し・メンテナンスの検査ルーチンが容易になります。As it produces low levels of friction， this product operates at a relatively low temperature。This means it experiences minimal wear and tear and is a low-maintenance choice.

SKF Ball Bearing， 110 mm ID， 240 mm OD - 6322 M/C3 When youre looking for a bearing that can handle a large load at a high operating speed， turn to SKFs deep-groove， single-row ball bearing。It can be used at speeds of up to 5，300 rpm and handles loads of up to 11.1 kg。This low-maintenance choice operates quietly and meets electrostatic control standards laid out by both the EU and UK。Youll find this common bearing type being used in heavy industrial equipment machinery， such as wind turbines， conveyors and railway equipment， with parts that rotate at high speeds. Open end type Deep-groove design for low friction torque Low noise and vibration Inside diameter of 110 mm Outside diameter of 240 mm Race width of 50 mm Application Information Food and beverage industries Automation systems Agricultural machinerySKF 深溝ボールベアリングは、特に汎用性が高くなっています。ボア径は 110 mm、外径は 240 mm です。高速及び超高速に適しており、両方向のラジアル荷重とアキシャル荷重に対応し、メンテナンスはほとんど必要ありません。深溝ボールベアリングは、最も広く使用されているベアリングタイプなので、SFKではさまざまなデザイン、タイプ、及びサイズを用意しています。 Why should I use a deep-groove ball bearing 1列 円筒形タイプの穴 スチールタイプベアリングDeep-groove ball bearings can support both radial and axial loads， so they can be used where pressure will be applied to a shaft both along its length and from the side。They operate with minimal friction， so theyre long-lasting and arent at risk of overheating.

。SKF Bearing Withdrawal Sleeves - AOH 304 Use this hydraulic withdrawal sleeve from SKF to mount and dismount a bearing from the cylindrical seat of a stepped shaft。Simply push it into the bore of the bearing to reduce the clearance from the shaft and achieve a tight fit。The sleeve features a duct with G 1/4 thread for oil injection， which virtually eliminates friction and makes dismounting easy。It has a bore diameter of 220 mm， with a small taper to an outside diameter of 240 mm for easy fitting to standard equipment. Coated with a solvent-free rust inhibitor to prolong the life of the product Oil injection method makes lubrication easy Bearing can be mounted at any point on the shaft Application information Automotive workshops Rotating industrial machinery Wind turbine industrySKF 回収スリーブは、シャフト径に合わせて調整するために使用し、円筒穴のベアリングシートと比較して、より広い直径の許容差を実現します。ベアリングを補完するためにスリーブが必要で、SKF では、アダプタスリーブ、引き抜きスリーブ、ロックナットなど、幅広いベアリングアクセサリを用意しています。 How do I mount a tapered bearing using a withdrawal sleeve シャフトにすばやく簡単に取り付け可能Coat both mating surfaces with a thin layer of light oil then push the bearing onto the sleeve。Install the appropriate accessories， fittings and pipes and inject oil until the mating surfaces are separated by a thin film。Open the oil release valve to the pump used for injection and allow the oil to drain for at least 20 minutes.

SKF Ball Bearing， 130 mm ID， 230 mm OD - 7226 BCBM Need a durable bearing thats able to accommodate a combined radial and axial load This angular contact bearing from SKF has inner and outer raceways that are displaced relative to each other in the direction of the bearing axis。This means it can safely handle the pressure from simultaneous loads。As this unit is a low-friction option， it offers a long service life and operates at a low temperature。It meets both British and EU electrostatic discharge standards， you can be sure it wont cause damage to equipment through accidental electrostatic discharge。This type of bearing is commonly used throughout heavy and light industries and can be found in everything from gearboxes to pumps and electric motors. Open end type Inside diameter of 130 mm Outside diameter of 230 mm Race width of 40 mm Nominal contact angle of 40 Application Information Machine tooling Steel mills Wind energy industry， including turbinesSKF アングルコンタクトボールベアリングは、内面が 130 mm、外輪軌道が 230 mm で、ベアリング軸方向に相対的に配置されます。このベアリングは、複合荷重(ラジアル荷重とアキシャル荷重を同時に処理)に対応するように設計されています。 アングルコンタクトボールベアリングの軸方向の積載荷重は、コンタクト角度が大きくなると増加します。接触角度は、ボールの接触点とラジアル平面の軌道を結合する線との間の角度で定義されます。この角度に沿って、結合荷重がある軌道から別の軌道に伝達され、ベアリング軸に垂直な線が伝達されます。 When should I use an angular contact bearing 1列 円筒形タイプの穴 スチール製ベアリング 公称接触角： 40 °Angular contact bearings are ideal for use in machinery that demands a high level of accuracy and durability。Theyre commonly used in machine tool spindles， vacuum pumps and centrifuges.

SKF Spherical Roller Bearing， 140 mm ID， 250 mm OD - 22228 CC/C3W33 This spherical roller bearing from SKF is a self-adjusting unit that effectively accommodates shaft misalignment。It delivers even load distribution and has a very high load-carrying capacity for heavy-duty applications。Its innovative self-guiding rollers keep friction and heat at low levels， so your equipment can operate efficiently。This lack of friction also reduces wear on the bearing， ensuring a long lifespan。Thanks to its steel construction， its highly durable and resistant to corrosion， so its suitable for use in harsh environments。A bearing like this is used in applications with heavy radial and axial loads in either direction. Suitable to use with compact machinery as its simple to mount in tight spaces Substantial fatigue load limit of 86.5 kN Supplied as a non-separable bearing for simple and time-saving installation Reduced maintenance and service costs due to low consumption of lubrication Application Information Wind power generation Medical and pharmaceutical manufacturing Off-shore drilling Pump manufacturingSKF 球面ローラーベアリングには、2 列の対称ローラー、共通スフィンベアリング外輪軌道、ベアリング軸に対して傾斜する 2 つの内輪軌道があります。外輪軌道の球の中心点は、ベアリング軸にあります。内径 140 mm、外径 250 mm です。 Does this bearing need maintenance ベアリングはスチール製です 円筒穴タイプThe bearing is wear-resistant and wont need frequent maintenance or replacement。It has three lubrication holes on the outer ring for simple re-greasing when necessary.

SKF Ball Bearing， 140 mm ID， 250 mm OD - 7224 BCBM This single-row angular contact ball bearing from SKF can take a radial load combined with a heavy axial load in one direction。The raceways are displaced relative to each other in the direction of the bearing axis。As the contact angle increases， so does the axial load-carrying capacity of the bearing。Its built for universal matching， making it simple to install。Because of their substantial load-carrying capacity， bearings of this type are commonly used in heavy machinery and agricultural equipment. Low-friction design produces little heat and extends service life Minimal noise and vibration levels for a safe working environment Smooth running properties allowing for rapid acceleration and deceleration Application Information Machine tools Steel mill Wind energy industries Compressors Industrial gearboxesSKF アングルコンタクトボールベアリングは、140 mm の内径と 250 mm の外輪軌道を備え、ベアリング軸の方向に相対的に相対的に配置このベアリングは、複合荷重(ラジアル荷重とアキシャル荷重を同時に処理)に対応するように設計されています。 アングルコンタクトボールベアリングの軸方向の積載荷重は、コンタクト角度が大きくなると増加します。接触角度は、ボールの接触点とラジアル平面の軌道を結合する線との間の角度で定義されます。この角度に沿って、結合荷重がある軌道から別の軌道に伝達され、ベアリング軸に垂直な線が伝達されます。 What type of seal is used in SKF single row angular contact ball bearings 1列 円筒形タイプの穴 スチール製ベアリング 公称接触角： 40 °SKF ball bearings use NBR (nitrile butadiene rubber) seals to form an effective barrier against oil and water。What is the operating temperature range of this bearing The permissible operating temperature range of this bearing is -40℃ to +100℃。Temperatures up to +120℃ can be tolerated for brief periods.

。SKF Ball Bearing， 240 mm ID， 320 mm OD - 61948 MA This deep-groove ball bearing from SKF carries axial loads in both directions， as well as radial loads。Its robust build makes it a good choice for demanding high-speed applications。High-precision balls and specially-designed raceways make for extremely quiet operation。This optimised design also contributes to a long service life， even in contaminated environments。Its heat-stabilised up to at least +120℃， so it can function even in challenging environments. Extremely high running accuracy Low vibration， which reduces operating noise High resistance to wear for improved longevity Can accommodate slight misalignment without performance being affected Reduced friction leads to lower operating temperatures for improved efficiency Application Information Agricultural equipment Food and beverage industries Transportation Wind energySKF 深溝ボールベアリングは、特に汎用性が高い製品です。高速及び超高速に適しており、両方向のラジアル荷重とアキシャル荷重に対応し、メンテナンスはほとんど必要ありません。深溝ボールベアリングは、最も広く使用されているベアリングタイプなので、SFKではさまざまなデザイン、タイプ、及びサイズを用意しています。内径 240 mm、外径 320 mm となっています。 What materials are this bearing made from ベアリングはスチール製です 円筒穴タイプThis SKF single-row ball bearing is made from stainless steel for reliable strength and high resistance to corrosion。Its cage is made from machined brass， which is unaffected by most common bearing lubricants， including synthetic oils and greases。As a result， the bearing is well-suited to harsh and dirty industrial applications.

SKF Ball Bearing， 110 mm ID， 200 mm OD - 6222/C3VL0241 Keep your high-speed machinery operating smoothly and precisely with this SKF ball bearing。Its aluminium-oxide coating protects the unit from the wearing effects of an electrical current to increase the bearings lifespan。It also keeps noise levels low。Plus， the coating reduces vibration and protects the bearings lubrication from charring to lengthen its grease life。This deep-groove ball bearing has a greater-than-average internal clearance for enhanced load distribution， meaning it offers improved performance and reliability. Open end type Inside diameter of 110 mm Outside diameter of 200 mm Race width of 38 mm Cylindrical bore type Application Information Food and beverage industry Textile manufacturing Aerospace industry Power generationSKF 深溝ボールベアリングは、特に汎用性が高い製品です。高速及び超高速に適しており、両方向のラジアル荷重とアキシャル荷重に対応し、メンテナンスはほとんど必要ありません。深溝ボールベアリングは、SKF で最も広く使用されているベアリングタイプであるため内径 110 mm、外径 200 mm です。 What is an open-end ball bearing ベアリングはスチール製です 円筒穴タイプAn open-end ball bearing， such as this one from SKF， allows grease to be flushed out when the unit is relubricated。This eliminates contaminants inside the bearing and helps to keep it clean and in working order。What is a micro-crater A micro-crater is a grey discolouration on a bearings raceways where the metal has melted due to heat generated by an electrical current.