Bearing seal types

 Bearing seal types. The designations of most SKF rolling bearings follow a designation system. 10 - 0. There are many other types and variations and, as mentioned, a combined option is also possible. CR Seals has also been part of SKF since 1990, a span during which we've developed new materials, manufacturing Rotary shaft seals provide sealing and wiping functionality for rotating and swiveling movements under low pressure and high velocity. Mechanical seal types vary in design, arrangement, and how they disperse the hydraulic forces acting at their faces. Precision insert-type bearings used commonly in internal combustion engines have a thin lining. While similar in design to the 2RS, this type of seal does not make contact with the inner ring, so it does not affect the torque of the bearing. 2. TA, TB, and TC oil seals exhibit varying degrees of temperature resistance. Wheel Bearing and Hub Assemblies (116) Wheel Bearings (92) Oil Seals (49) Wheel Bearing Seals (35) Axle and General Purpose Seals (29) Axle Bearings (16) Pinion Seals (9) Wheel Bearing Races (8) Transfer Case Seals (6) Axle Bearing Races (5) Brake Hub Dust Caps (5) Wheel Bearing & Seal Kits (3) Show All. (Note: The contact seal ring of NSK bearing is expressed as DDU, contact seal ring of NTN bearing is expressed as LLU) RZ: There is a skeleton type rubber seal on one side of the bearing (non-contact type). Three types of mechanical seals are used in process equipment: Cartridge. If the seal allows external contaminants to enter the bearing or lubricant to escape from the bearing, then premature failure of the unit will occur. This is because the lip is made so that pressure applied to it from the "wet" side of the seal will tend to increase the pressure the lip applies to the shaft. Compare. Mar 1, 2016 · “The selection of a shield or seal is dependent on the bearing application and environment,” said Picard. They are removable. 005 inches between the inside diameter of the shield and the bearing inner ring. The motions allowed, or. High-Pressure Rotary Shaft Seals. SKF supplies several bearing types capped with a seal or shield on one or both sides. ball bearing shields and seal types Z TYPE SHIELD This is the most common type of shield. Nov 17, 2023 · Ordinary bearing lubricant can be used for this purpose. In stock and ready to ship. A labyrinth seal is a type of bearing isolator that combines contact and non-contact seal elements into a single component. STEP 8. Single-Acting Rod Seals: These seals are designed for applications where pressure is applied on one side of the piston, commonly found in hydraulic cylinders with piston rods. They deter the ingress of external contaminants such as dirt, dust, and moisture, while also preventing the leakage of internal lubricants. “Shields are metallic and there is no contact between the shield bore and the bearing inner ring. Choose from our selection of 6004 ball bearings in a wide range of styles and sizes. In order to meet the requirements of a variety of different Temperature Resistance: A Critical Aspect. These are just a couple of the more common closures that are available. • General engineering information, including nomenclature, technical specifications, tolerance charts and more. We and our partners are using technologies like cookies and process personal data like the IP-address or browser information in order to personalize the advertising that you see. It prevents bearing failure by adding an extra layer of protection between the bearings and the outer environment. It is non-removable, being permanently staked to the bearing outer race with a small gap of approximately . RS - Bearing with rubber seal on one side, one side open. Each bearing type has characteristic properties that make it more or less suitable for use in a given application. All types of ball-bearings are available: Deep-groove ball-bearings, including miniatures: 1. These materials have characteristics that make them particularly suitable for specific applications. Basic bearing designation system. MasterPro 5000 To 6000 Lbs. The primary function is to retain the bearing or system lubricant in the system to avoid leakage. Machinery is being made smaller and more compact; the same is demanded of bearings. They perform two essential functions. SKF Industrial seals Portfolio. A contact seal, also known as a lip seal, is a rubber part (typically Buna-N and nitrile) bonded to a steel insert. For Instance Read more about our shielded and sealed plastic bearings and other types of bearing design to keep out liquid and debris that can damage the bearing or product. To protect the bearings, SKF offers a wide assortment of external and integral seals. Lip seals are generally constructed with a rubber sealing element bonded to a steel insert to provide increased strength and rigidity. Various types of contact seals are available. Types of Bearing Seals . The collar centers your shafts and secures them better than set screw ball bearings, which reduces vibration and noise. Such as bearings with dust cover, sealing ring and so on. A cage. These are more To protect the bearings, SKF offers a wide assortment of external and integral seals. +44 (0)1423 799200 Web-enquiries@bnl-bearings. Industrial shaft seals are used to seal the opening between a rotating and a stationary component, or between two components in relative motion. These refer to the sizes of the hardware for which the oil seal is designed. 2RS is the most common terminology for this type of seal and Large-size bearings used for heavy machinery normally have heavy lining. Non-split Plummer block housing. Figure 16. FAG (Schaeffler) Self-aligning ball bearings are double row, self-retaining units comprising outer rings with a concave raceway, inner rings with a cylindrical or tapered bore and ball and cage assemblies. A bearing is a machine element that constrains relative motion to only the desired motion and reduces friction between moving parts. And then we can also operation with metal shields. Get Results; Brand . TA oil seals, with materials like fluorocarbon, excel in high-temperature environments. This product line includes standard, proprietary and patented high-pressure rotary seal designs and materials to overcome one An example of an SKF number would be 6318ZZN-C3. Combine with threaded pipe to mount these bearings in a variety of positions without the need for a flat mounting surface. Engineering service. These little parts are like bodyguards for bearings, keeping dirt and other bad stuff out while keeping the grease in, which is super important… A typical rolling bearing consists of the following components ( fig. Also known as oil seals, use these to retain oil on rotating shafts in motors, pumps, bearings, and gearboxes. However, if correctly specified and Ultra-Precision Ball Joint Rod Ends. Both roles can help extend the life of your bearings, but it’s crucial to find the right seals for your parts. NTN seal and shield type ball bearings are built to meet these trends. Axle Capacity Trailer Seal And Bearing Kit - BT10. External seals. We have addressed this issue with new designs and bearing seals materials which provide reduced friction and longer service life, keeping lubricants in and contaminants out. Contacting Seals (2RS, LLU, DD, Enduro LLUMAX) These seals have the best ingress against dirt and moisture but they also have the highest rolling resistance. 1 ): An inner ring. For the last 110+ years, CR Seals has been setting performance and service life standards for industrial and automotive shaft seals. Detailed guidance can be found in specialized seal design manuals. Aug 13, 2020 · For Example: 6210-2RS. Typical applications: motors and pumps, rotary couplings, brakes, winches and draw works, rotary manifolds, drilling equipment, mixers. Component. The complete bearing designation may consist of a basic designation with or without one or more supplementary prefixes and suffixes ( diagram 1 ). Bearings. So depending on the bearing’s size and the PS-I Oil Seals 50 - 70 4 - 8 0. Highest Performing seal in North America, Russia, Brazil and Australia. •Lip Seals on both sides. The common seals for industrial applications are standard seals , standard seals with additional flingers , multiple seals , and 5-lip seals . This not only helps the bearing perform as expected, but also prevents maintenance workers from having to relubricate them constantly to make sure clean grease/oil is in the bearing rolling element path. If the bearing number uses the AFBMA code, look for "EE" (or "2RSI" for SKF) to determine if the bearing is sealed on both sides. Ability to withstand pressure and yet permit movement on other surface with minimum wear and tear. Other types of oil seals and grease seals include: Single lip oil seals. A cartridge-mounted, end-face mechanical seal is a self-contained unit that houses the sealing components—a gland, sleeve, and hardware. Jul 23, 2020 · Bearing seals actively do double duty, preventing contaminants from reaching the inside of your parts while keeping lubricants from leaking out. Press-fit seals into the bore around the shaft. We also use it in order to measure results or align our website content. They are comprised of a rotor (rotating) and stator (stationary) member. This guide explains the key characteristics for each of these closure options, the lubrication options and application advice. A cartridge seal allows the unit to be preassembled and preset by the Fortunately, SKF’s range of insert bearings and ball bearing units have specific features designed for agricultur e-specific equipment. Increase productivity and process reliability, and reduce total cost of ownership with innovative sealing solutions from SKF. from escaping Seals and must stop not dust, cause water A good bearing seal will also ensure that grease and lubricant stay inside the bearing. Most commonly made of Buna-rubber. In this example, this oil seal is suitable for: 6-mm shaft diameter x 15-mm groove diameter x 4-mm minimum groove width. STEP 6. Wd. Unlike bearing numbers which are universal across manufacturers, seal types carry designations that are manufacturer specific. 2. Shield and Seal Types. These seals are typically installed at the interface between a rotating and stationary component, such as a shaft and housing, to maintain the integrity of lubricated systems. RS provides a better seal but more rolling friction than 2Z. Their low firction torque enables them to be used in the areas that require high-speed rotation, low noise and low vibration. Single-row angular contact bearings, including 4 points of contact: contact angles of 40° and 30°, steel, polyamide or solid brass cages. Jun 29, 2017 · There’s nothing we can do with lubrication. A labyrinth seal is a type of mechanical seal that provides a tortuous path to help prevent leakage. Glass balls have even more corrosion resistance than stainless steel balls. Unbalanced seals. Through several different input parameters you can easily ind a suitable SKF sealing solution for a speciic application. This seal is designed to apply continuous pressure on a bearing’s inner ring, which creates the contact found in the seal’s name. Sealing rotary motion up to 10,000psi (690bar)*. Seals are vital to the cleanliness of the lubricant and the service life of the bearings. Axial Shaft Seals: These seals are used for axial sealing, where Tru-Guard® Bearing Seals. The secondary function of a rotary shaft seal is to preclude any contamination of the system by external particles or other The Three Types of Mechanical Seals. The purpose of a labyrinth seal is to prevent leakage and contamination by presenting both substances with a challenging path to follow. “Bearing failure is the most common cause Bearing (mechanical) A ball bearing. Lubricant Retention: Bearing seals help retain the Operating temperature and speed. Founded in 1878 as Chicago Rawhide, CR Seals has one of the longest histories in the seal industry. Mar 20, 2020 · Different Types of Mechanical Seals for Centrifugal Pumps. NTN’s LLU seals doubled bearing life and cut maintenance in half, resulting in $26,964 of cost savingsfor the customer. As the distributors for Enduro bearings Thread-Mount Bearings. There’s black seals on each side of the bearing, those are rubber seals that keep out contamination and keep the grease inside. (Cost Savings Reference: CS-0322) A major North American based steel mill was experiencing bearing failures on the anti-crimping and anti-flutter rolls in its cold rolling mill that cost an Labyrinth Seals . The most common seal types include the following: Balanced seals. Bearings are filled both sides with Mobilgrease XHP 222 mineral oil based grease for the best protection and long lasting set up. Part Type . Regarding the bearing itself, some bearing indicates the bearing type and the bore size. The majority of sleeve bearings are of the split type for convenience in maintenance and replacement. The crankshaft of engines, axles of automobiles, etc. Pure labyrinth seal – tortuous path ball bearing shields and seal types Z TYPE SHIELD This is the most common type of shield. Choose from our selection of sealed roller bearings, including over 1,100 products in a wide range of styles and sizes. Excess liquid or vaporized oil is led off or collected at the bottom center location of the bearing housing. Apr 3, 2024 · Bearings are classified according to the type of operation they do. The design of the bearing may, for example, provide for free linear movement of the moving part or for free rotation around a fixed axis; or, it may prevent a motion by We have addressed this issue with new designs and bearing seals materials which provide reduced friction and longer service life, keeping lubricants in and contaminants out. This is crucial for maintaining a clean and controlled environment within the bearing housing, reducing the risk of wear and damage. Our offer includes sealing solutions for several types of bearing applications, such as: SKF offers bearing seals for applications such as hub units (light vehicle and Mar 22, 2024 · When it comes to machinery and equipment, the quality of bearing seals plays a big role in how well things work and how long they last. In a closed oil mist application, the oil mist is introduced in the space between magnetic seal and bearing. Sealing, mounting and dismounting. Oct 12, 2023 · The primary method of sealing the bearing housing involves introducing a seal between the bearing cover and the rotating shaft. Our offer includes sealing solutions for several types of bearing applications, such as: SKF offers bearing seals for applications such as hub units (light vehicle and Bearing isolators are dynamic seals designed to protect bearings from outside contaminants. TB oil seals, with materials like fluoroelastomer, withstand a broad temperature range. This helps us to show you more relevant ads and improves your internet experience. 2RZ: Skeleton rubber seals on both sides of the bearing (non-contact type). An oil seal or its product description is usually associated with three dimensions, for example 6x15x4. They simplify shaft design, are maintenance-free, and are the bearing of choice for an increasing number of applications. Other types: On larger bore bearings (above 10mm), labyrinth type rubber seals are available. Bearings capped on both sides are factory-filled with grease. SKF. 20 Bearing Isolators Not Specified 64 maximum 1. The contact angle between the ferrule and the ball is one of the key factors in determining the characteristics of a bearing. 5mm to 1,320mm bore. STEP 7. Click the card to flip 👆. A labyrinth seal may be composed of many grooves that press tightly inside another axle, or inside a hole, so Nov 12, 2023 · Non-contact seals are a type of bearing seal designed to provide a protective barrier without direct physical contact between the seal and the rotating element. For off-highway applications, we offer undercarriage sealing solutions for wheeled equipment, which include SKF Mudblock Feb 24, 2019 · An alternative seal is the 2RU. This is the only way to identify whether a bearing is It is crucial to utilise oil seals to prevent the accidental leakage of lubricant and potential damage to sensitive internal components. A seal must always be installed so that the sealing lip is facing the fluid to be sealed. To the directions of the loads or forces applied to the parts. K - Bearing with taper bore. Choose from our selection of precision stainless steel ball bearings, precision ball bearings, angular-contact thrust ball Types of Hydraulic Rod Seals. Split Plummer block housing. ” Seals are constructed from various elastomeric materials. Focus on the range of NTN-SNR ball-bearings. Availability. 412 mm: Overall Self-Aligning Ball Bearing - Double Contact Sealed, Double Row, 22-2RS Series. There are two categories of We have addressed this issue with new designs and bearing seals materials which provide reduced friction and longer service life, keeping lubricants in and contaminants out. This creates a more effective seal without increasing torque. Various types of seals can be used, such as labyrinth seals, rubber skeleton seals, felt seals, and more. Our offer includes sealing solutions for several types of bearing applications, such as: SKF offers bearing seals for applications such as hub units (light vehicle and LLB seals are comprised of Nitrile material rubber with a steel insert and ideally suited for constantly spinning bottom bracket and hub bearings. These basic designations are defined in the German DIN 623 standard and the relevant ISO standard. E - Reinforced Design. To be effective, industrial shaft seals should operate with a minimum of friction and wear, even under unfavourable operating conditions. The basic design. Max. Air. Flanged housing. There are three standard contact angles: 15°, 30°, and 40°. Seal. By changing the actual formulation and blending, it is possible to modify the characteristics of the elastomers relative to: Resistance to swelling. LU Seal Success Story #2. In a typical application, an oil seal – also known as a rotary shaft, grease, fluid or dirt seal – is usually located adjacent to the bearing on most equipment. Our offer includes sealing solutions for several types of bearing applications, such as: SKF offers bearing seals for applications such as hub units (light vehicle and Operating temperature and speed. 1. P2 - Highest precision. They provide an economic and space-saving It represents the ideal bearing housing closure for closed, environmentally acceptable oil mist lubrication systems. 1 provides a comparison of different types of journal bearings. We are the worlds only bearing company with seal manufacturing capabilities, and supply a wide range of sealing solutions for rotating, reciprocating and static applications to industries Operating temperature and speed. More than 2 million in service worldwide. SKF industrial shaft seals are generally manufactured from the materials listed in the table. Matrix 1 gives an overview of the main bearing types (including their major features and design variants) and their degree of suitability for certain aspects of use. The common applications of bearings are: Shafting in workshops, Spindles of a machine tool such as a lathe, drilling, milling machine, etc. For common seal designations you will find in many catalogs RS, 2RS, LB, LLB, LU and LLU. Bearing arrangements generally include a shaft, bearings, housing (s), lubricant, associated components, and seals. By doing so, they help to ensure that Bearing bearings seals can prevent last as lubricants long as possible. Part #: BT10 Line: MPB 1 Year Limited Warranty Aug 19, 2023 · This article primarily focuses on the features, differences, and appropriate applications of 14 common types of bearings. When specifying closures, you need to consider the bearing's width along with the compatibility of the retainer and shield type to allow for appropriate clearance. Seals and Shields. For technical drawings and 3-D models, click on a part number. Designed to stand up to frequent washdowns, you can quickly secure these ball bearings onto shafts with the clamp-on collar in food, beverage, pharmaceutical, and chemical plants. CONTACT SEALS. Double lip rubber seals are also available and or normally of the labyrinth type. Rather than one thick 2RS seal lip rubbing on a blunt surface, LLB type utilizes two razor thin sealing lips riding in the bearing race groove. A spring secures the lip against the shaft, preventing messy leaks. Download the guide here, to determine which bearing We have addressed this issue with new designs and bearing seals materials which provide reduced friction and longer service life, keeping lubricants in and contaminants out. 906 in 175. Some bearing isolators are of labyrinth construction while others use O-rings or other positive seals. Wheel end seals. The basic designation identifies: The bearing type. Labyrinth seals are made up of several components, one of which is Shields are good to around 350 F. They provide high precision and low friction and therefore enable high rotational speeds while reducing noise, heat, energy consumption and wear. Double-row radial contact bearings: series 4xxx. Feb 25, 2014 · The types of seals most commonly used with rolling (ball and roller) bearings are contact or lip seals; non-contact seals; and, to a lesser degree, various types of bearing isolators that combine the functions of contact and non-contact seals in different ways. V-ring seals are axial shaft seals, available in a wide range of stock sizes and customized solutions for sizes above 2 000 mm or special requirements. Oct 25, 2022 · The two different types of seals that are most commonly used in power transmission applications are radial shaft seals and axial shaft seals. • Type of bearing • Organization by seal type, with special sections for single lip, dual lip and special purpose seals. Seals in wheel end applications are key in determining the life of the entire unit. CR Seals are radial and axial shaft sealing solutions for power transmission applications supports virtually every industrial sector, from large-size wind turbines to very small, high-speed machine tools. 2 Z / ZZ - Bearing with a metal seal on both sides. Recommendations for Bearing Seals Abstract Equipment downtime and reduced component life are a few of the consequences – and potential costs – of using the wrong seals on many types of industrial equipment including pump bearing frames, electric motors, fans, pillow blocks, gearboxes and more. An outer ring. Take-up housing. You can contact us by phone, email or via the contact form below, or follow us on social media. The seal is part of the bearing integrated in the units. Jan 23, 2024 · An Overview of High-Performance Industrial Bearing Seal Options: Lip Seals: Lip seals are perhaps the most common type of contact seal used across many of today’s industrial bearing applications. For bearing arrangements where the effectiveness of the seal under specific operating conditions is more important than space considerations or cost, there are two types of external seals available: non-contact seals and contact seals . This design minimizes friction and wear, making non-contact seals an ideal choice for applications where reduced power loss and lower operating temperatures are critical. Made to extremely tight tolerances, these externally threaded rod ends are for applications that require positioning accuracy, such as accelerators and other types of control linkages. Two-bearing housing. With proven railroad performance since 2010, the Tru-Guard® boasts a true non-contact, virtually zero-torque seal design. NHBB offers a variety of protective closures designed to retain lubricants and prevent contamination from reaching critical bearing surfaces. To retain the lubricant and prevent leakage, oil seals are designed to seal the spaces between stationary and moving mechanical components, such as the housing and shaft, which are SKF Seal Select is an online seal and accessory selection tool. Types of designations for shields are Z and ZZ where in this case a metal shield plate is affixed to the outside ring. Premium seal material for wear and temperature resistance Optimized seal lip(s) cap- able of misalignment and long life Precision ground surface can reduce seal wear and extend seal lip life Knurling Overview of Bearing Types Plane Bearings: Sleeve, Journal, Bushing. The bearing seals are dual lip, groove type seals rather than standard 2RS types that other manufacturers use; one lip to keep the dirt out and the other to keep the 90% grease fill inside. For sealed bearings the Inner ring incorporates a V-groove and labyrinth clearance. Spindle Type: Straight. An example of such a seal is sometimes found within an axle 's bearing to help prevent the leakage of the oil lubricating the bearing. Jul 27, 2023 · Bearing seals are crucial components designed to maintain the operational integrity of types of bearings. Our offer includes sealing solutions for several types of bearing applications, such as: SKF offers bearing seals for applications such as hub units (light vehicle and Dec 2, 2020 · Let’s break down the different types of seals available for your bearing products. Common types include sleeve bearings and flange bearings (see below for more on both). DGBB Seal ( Deep groove ball bearing seal ) Deep groove ball bearings used in various fields have deep arch grooves in the orbits of both their inner and outer rings. Prefixes and suffixes denote special modifications, for example if the internal clearance or accuracy A Pacific Seals® bearing isolator is a technology used primarily in rotating ancillary equipment—like pumps, gearboxes, electric motors, split pillow blocks, and even steam turbines. Washdown Clamp-On Collar Ball Bearings. Nov 1, 2023 · The Different Types of Bearing Housing. SKF supplies also metal-cased V-ring seals: All-rubber V-rings ( fig 1 ), or just called "V-rings". Radial Shaft Seals. Apr 18, 2024 · 3. These three sections include critical information for easy and accurate seal selection. Non-contact– no rubbing lips or surfaces. 63 maximum Required Shaft Required Shaft Finish Seal Type Hardness µin (micro- µm (micro-Rockwell C inches) Ra meters) Ra Table 1: Shaft Requirements Table 2: Determination of Lead (Source: RMA Handbook OS-1/1985) Spring-Loaded Rotary Shaft Seals. com. FAG Dec 7, 2023 · Radial Shaft Seals: These are the most common type of oil seal, used to seal rotary elements such as a shaft or rotating bore. Balls or rollers, as rolling elements. SKF's oil and grease sealing wheel end seals offer enhanced performance in a wide range of Seal Type Shaft Size Outer Diameter Overall Width Material; 5106: Seal Type N/A: Shaft Size N/A: Outer Diameter N/A: Overall Width N/A: Material N/A Silicone : 5118: Seal Type N/A: Shaft Size N/A: Outer Diameter N/A: Overall Width N/A: Material N/A Nitrile : 5419: Seal Type N/A: Shaft Size N/A: Outer Diameter N/A 6. Also known as rotary shaft seals, oil seals play a vital role in this process but, because they are available in a variety of types, sizes, and materials, it can be challenging to select the right ones for each industrial application. Generally the speed rating is reduced about 35% that of the ‘Z’ type or open Chapter 17 Bearing & Seals. 316 stainless steel balls have excellent corrosion resistance. The primary function of single-acting rod seals is to prevent leakage of hydraulic fluid from the cylinder. For most bearing types, the basic designation is made up of numbers, but some are alphanumeric. They offer the best sealing against contamination and lubricant leakage. Metallic shields are the most common and affordable type of bearing enclosure. There’s a central bearing here on the right and a double ball bearing. Z - Bearing with a metal seal on one side, one side open. You can think of a plane bearing as a bearing in its simplest form: any non-rolling element that is incorporated where two surfaces rub together is a plane bearing. When trying to decide whether a bearing is sealed using the AFBMA or SKF code, note the shields or seals section. The seal of the bearing can be divided into two types: self-contained seal and external seal. For Instance: 6210-RZ. If the seal is installed backwards, pressure acting on the V-ring seals. Angular Contact Ball Bearing. The so-called bearing self-sealing is to manufacture the bearing itself into a device with sealing performance. Dec 28, 2023 · Contaminant Exclusion: Bearing seals act as barriers that prevent the entry of contaminants such as dust, dirt, water, and abrasive particles into the bearing. Back. Rolling bearings support and guide rotating or oscillating machine elements – such as shafts, axles or wheels – and transfer loads between machine components. Designed to protect bearings, keep lubricants in, and improve system reliability, radial shaft seals feature a sealing lip, metal case, and tensioning spring, as well as a dust lip. As the distributors for Enduro bearings Rolling bearings. Bearing seals can prevent lubricants from escaping and stop dust, water and other harmful substances such as Seals metal particles from getting into the bearing. Bearing execution. Feb 2, 2016 · Understanding Wheel Bearing Seals. These bearings have a groove on the inner ring as well where the seal lip makes contact. Bearing interfaces. MVR axial shaft seals ( fig 2 ), a metal-cased V-ring seal. ‘RS’ Type Seal – The ‘RS’ type seal is a rubber seal that makes contact with the inner race. Characteristics of Bearing. Temp. The parts must be held in close tolerances to provide quiet and efficient operation and at the same time permit freedom of motion. TC oil seals, often featuring PTFE, offer Jan 26, 2024 · Oil seals, also known as shaft seals or grease seals, play a crucial role in machinery by preventing the leakage of lubricants and the ingress of contaminants. Contact seal (bearing 2RS type) Non-contact seal (bearing 2RU type) Picking between these options is largely dependent on your desired application and environment. Housings are available in many sizes and generally fall into five standard categories: Split Plummer (or pillow) block housings, Non-split Plummer block housings, flanged housings, take-up . uy zr tu yn ev zb gp vf nc uf