- Catalogs
- SKF AEROSPACE
- Y-bearings and Y-bearing units
Y-bearings and Y-bearing units
Y-bearings and Y-bearing units
SKF is a global leader in industrial knowledge, offering a wide range of Y-bearings and Y-bearing units. This document provides detailed information on the selection, application, and maintenance of these products, highlighting SKF's commitment to innovation and sustainability.
This section outlines the criteria for selecting Y-bearings and units, including design considerations, bearing terminology, and the selection process based on load, speed, and temperature requirements. It also covers the design of Y-bearing arrangements, including axial displacement, misalignment, and support surfaces.
Y-bearings are detailed with product tables for various configurations, including those with grub screws, eccentric locking collars, and tapered bores. Specifications are provided for both metric and inch shafts.
This section describes plummer block units with different housing types and locking mechanisms. It includes product tables for units with grub screws, eccentric locking collars, and adapter sleeves, catering to both metric and inch shafts.
Flanged Y-bearing units and take-up units are discussed, highlighting their mounting instructions and compatibility with different housing materials and locking mechanisms.
Specialized units like SKF ConCentra ball bearings and SKF Food Line Y-bearing units are introduced, focusing on their unique features and applications.
Guidelines for lubrication, relubrication intervals, and mounting instructions are provided to ensure optimal performance and longevity of the bearings.
SKF's extensive range of Y-bearings and units, combined with their expertise in engineering and sustainability, offers reliable solutions for various industrial applications.
The document provides a comprehensive guide on SKF Y-bearing units, detailing their designs, materials, and applications. It highlights the different locking methods, load capacities, sealing options, operating temperatures, and speed capabilities of these units.
SKF Y-bearing units come in three designs with options for cast or pressed steel housings. Each design has unique features suitable for specific applications. Cast housings can handle heavier loads and allow for relubrication, while pressed steel housings are more economical and easier to mount but support lighter loads.
Key factors in selecting a Y-bearing unit include shaft location, load type, sealing requirements, operating temperatures, and speeds. The document emphasizes considering the total cost and inventory implications when choosing a bearing arrangement.
There are five methods to secure Y-bearing units onto shafts: grub screws, eccentric locking collars, adapter sleeve locking, SKF ConCentra locking, and interference fit. Each method has specific applications based on load and rotational direction.
The document categorizes loads into very light, light, moderate, normal, and heavy, with recommendations on housing materials based on load magnitude. Cast iron or composite housings are preferred for heavier loads, while pressed steel is suitable for lighter loads.
Sealing methods depend on speed, friction, and environmental conditions. Standard integral seals provide good protection, while additional flingers or multiple seals are recommended for more contaminated environments.
The permissible operating temperatures are influenced by the bearing, cage, seal materials, and grease used. Different grease types have specific temperature ranges, and the document provides guidelines for reliable operation.
The speed capability of Y-bearing units is affected by the attachment method and sealing arrangement. Units with concentric fits allow for higher speeds and reduced vibration.
The document explains how to determine the appropriate Y-bearing size based on load and required life, using ISO standards for dynamic and static load ratings. It also introduces the SKF rating life equation for more accurate performance predictions.
SKF Y-bearing units are versatile and used across various industries. For applications involving health, safety, or environmental risks, SKF's application engineering service should be consulted.
The document provides detailed specifications for Y-bearings and Y-bearing units, including calculation factors for thrust and load. It emphasizes the importance of calculating equivalent loads for fluctuating bearing loads and provides formulas for mean load calculations within duty intervals and rotating loads.
Dynamic bearing loads are influenced by external forces such as unbalanced conditions and belt-driven applications. The document provides guidelines for calculating these loads and emphasizes the importance of a minimum radial load for satisfactory operation. Static load carrying capacity is crucial for bearings under stationary or slow-moving conditions, with guidelines for selecting bearing sizes based on static load ratings.
The axial load carrying ability of Y-bearings depends on the locking method onto the shaft. The document provides guidelines for maximum axial loads based on different mounting methods, such as grub screws or adapter sleeves.
The permissible operating speed of Y-bearings is influenced by the type of seal and shaft tolerance. The document provides limiting speeds for various bearing series and emphasizes the importance of proper design to accommodate axial displacement and misalignment.
Guidelines for attaching Y-bearing units to support surfaces are provided, including recommended bolt types and shaft tolerances. The document stresses the importance of proper support surface preparation to maximize bearing life.
The document includes several tables and diagrams that provide calculation factors, limiting speeds, and design guidelines for Y-bearings. These visual aids are essential for understanding the technical specifications and installation requirements.
Y-bearings on an adapter sleeve or with SKF ConCentra locking require a shaft seat machined to h9/IT5 tolerance. For Y-bearings with a standard inner ring, the same recommendations as for standard deep groove ball bearings apply. ISO shaft tolerances are detailed in tables 3a and 3b.
Rubber seating rings in the RIS 2 series are used to cushion Y-bearings in pressed steel plummer block housings, dampening vibration and noise. They are made from acrylonitrile-butadiene rubber (NBR) and operate between -30 to +100 °C. The dimensions and designations are listed in table 4.
End covers protect the bearing arrangement at the shaft end and are available for composite and most cast Y-bearing units. Made from polypropylene, they withstand temperatures up to 100 °C. Three designs are available: ECY, ECW, and ECL.
Standard SKF Y-bearings are filled with a high-quality mineral oil-based grease. Special food-grade grease is used for certain series, meeting FDA and USDA standards. Relubrication is not required under moderate conditions but is necessary for high humidity, heavy loads, or high temperatures. SKF LGWA 2, LGMT 2, or LGMT 3 greases are recommended for relubrication.
Proper mounting is crucial for bearing performance. The method depends on machine design, housing design, and attachment method. Tools required include hexagonal keys and hook spanners. Y-bearings should be handled carefully and mounted with clean, burr-free shafts.
The document provides detailed specifications for Y-bearings and Y-bearing units, including shaft diameters, hook spanner sizes, and tightening torques. For example, the YSA 205-2FK series requires a hook spanner HN 5 with a tightening torque of 13-17 Nm.
- Y-Bearing Plummer Block Units with Grub Screws: Align the units using the shaft, tighten attachment bolts, and secure grub screws to specified torque.
- Y-Bearing Plummer Block Units with Eccentric Locking Collar: Similar to grub screws but includes steps for securing the eccentric locking collar.
- Y-Bearing Plummer Block Units with Adapter Sleeve: Involves positioning the adapter sleeve, securing with a lock nut, and ensuring the sleeve does not rotate during tightening.
- Flanged Y-Bearing Units: Instructions vary slightly depending on whether the housing is composite or cast, and whether it uses grub screws or an eccentric locking collar.
- Y-Bearing Take-Up Units: Similar mounting steps with emphasis on aligning the shaft and securing the locking collar or grub screws.
The document includes several figures illustrating the mounting process, such as the positioning of components and the use of tools like hook spanners.
Key parameters include the correct use of tools, adherence to specified torque values, and ensuring proper alignment of the shaft and bearings to prevent operational issues.
Y-bearings and Y-bearing units are treated with a rust preventive compound and can be stored in their original unopened package for several years. They should be kept in a vibration-free, dry environment with relative humidity not exceeding 60% and a constant temperature. Long-term storage may increase initial starting torque and deteriorate grease lubricating properties. Bearings not in original packaging must be protected against corrosion and contamination and should be identified by their complete designation.
The complete designation for a Y-bearing or Y-bearing unit includes prefixes for series identification, figures for size, and suffixes for designs and variants. Detailed designation systems are provided in tables for Y-bearings and Y-bearing units, specifying series, dimension series, bore diameter, seals, material, and other features.
SKF Y-bearings, also known as insert bearings, are sealed deep groove ball bearings available in various series and sizes. They differ in shaft location methods, including grub screws, eccentric locking collar, adapter sleeve, interference fit, and SKF ConCentra locking. The standard assortment includes bearings made of rolling bearing steel, stainless steel, and zinc-coated components.
These bearings are locked on the shaft by tightening two hexagonal grub screws. They are suitable for constant or alternating rotation directions. The YAT 2 series has an extended inner ring on one side, while the YAR 2 series has an extended inner ring on both sides, reducing tilt and enabling smoother operation. Both series are available with different flinger options and can be supplied without lubrication holes upon request.
Y-bearings with zinc-coated rings are designed for corrosive environments, featuring multiple seals made of food-compatible rubber and stainless steel flingers. They are filled with food-grade grease and can be relubricated through outer ring lubrication holes.
These bearings are made entirely of stainless steel, including rings, balls, seal parts, and grub screws. They feature efficient seals and food-grade grease, with relubrication capability. The dynamic load capacity is lower than standard steel bearings.
Designed for constant rotation applications, these bearings have an eccentric extension on the inner ring for locking. The YET 2 series has an extended inner ring on one side, while the YEL 2 series has it on both sides, reducing tilt. Both series offer different flinger options and can be supplied without lubrication holes upon request.
The document provides detailed technical specifications and descriptions of various Y-bearing units and plummer block units, including their dimensions, load ratings, and design features. It covers both metric and inch shaft sizes and includes information on different housing materials and configurations.
The document lists Y-bearings with tapered bores on adapter sleeves for metric shafts (20-60 mm) and inch shafts (3/4 - 2 3/8 in). It provides dimensions, basic load ratings (dynamic and static), fatigue load limits, and mass for each bearing type. Designations for bearings and adapter sleeves are also included.
The document describes various designs of Y-bearing plummer block units, including those with composite, cast iron, and pressed steel housings. It highlights the different locking mechanisms available, such as grub screws, eccentric locking collars, and adapter sleeves. The document also discusses the sealing options for these units.
These units feature housings made of composite material, designed for reliable operation in challenging environments. They are part of the standard SKF product range and are attached to shafts using grub screws.
These units are suitable for high contamination, high speed, high temperature, and heavy load conditions. They come in various designs, including SY, SYH, SYM, and SYF series, each with specific features and applications.
Designed for simple applications with limited loads and speeds, these units consist of a two-part housing and a Y-bearing. Rubber seating rings are available to reduce noise and vibration.
The document provides general information on dimensions, tolerances, radial internal clearance, materials, load carrying ability, and mounting instructions for Y-bearing plummer block units.
The document outlines the specifications for various series of Y-bearing plummer block housings. The SY, SYH, and P series are in accordance with ISO 3228:1993, with deviations in the center height H1. The SYJ series complies with JIS B 1559-1995. The SYF, SYFJ, and SYM series are not standardized but are common in the market.
Tolerances for shaft center height H1 are specified as ±0.25 mm for units with a bearing bore diameter ≤ 40 mm, except for the SYK series, which has a tolerance of ±0.31 mm. Larger units have a tolerance of ±0.30 mm.
Composite housings in the SYK series are made from glass fiber reinforced polyamide 6 with steel reinforcement. Cast housings in the SY(J), SYH, SYM, and SYF(J) series are made from grey cast iron EN-GJL HB195. Pressed steel housings in the P series are zinc-coated for corrosion protection.
Composite and grey cast iron housings can withstand dynamic and static loads similar to the Y-bearings they incorporate. Pressed steel housings have a lower load capacity, with axial loads not exceeding 20% of the permissible radial load.
End covers are available for composite and cast Y-bearing plummer block units to protect shaft ends. The ECY 2 series end covers are shown in product tables.
Mounting procedures depend on the housing design and attachment method to the shaft. Detailed instructions are provided in the mounting instructions section.
Standard SKF Y-bearing plummer block units are filled with a high-quality grease with a lithium-calcium thickener, except for units intended for the food industry.
The document includes tables detailing dimensions, load ratings, and designations for various bearing units. Figures illustrate the housing designs and mounting configurations.
This document provides detailed specifications and dimensions for Y-bearing plummer block units with cast housing and grub screws, designed for inch and metric shafts. It includes information on designations, load ratings, dimensions, and appropriate end covers.
The document lists various bearing units with their respective designations, basic load ratings (dynamic and static), fatigue load limits, speed limits, and mass. The units are categorized based on shaft diameters ranging from 1/2 inch to 3 inches for inch shafts and 15 mm to 60 mm for metric shafts.
Detailed dimensions are provided for each bearing unit, including measurements for diameter (d), width (A, A1, B), height (H, H1, H2), and other critical dimensions (J, L, N, N1, G, s1). These dimensions are crucial for ensuring compatibility and proper fit in various applications.
Each bearing unit is identified by a specific designation, which includes information about the housing and bearing type. The load ratings are expressed in lbf/kN, indicating the maximum load the bearing can handle dynamically and statically.
The document suggests appropriate end covers for certain bearing units, which are essential for protecting the bearings from contaminants and ensuring longevity.
The tables provide a comprehensive overview of the bearing units, including their designations, load capacities, speed limits, and mass. This data is critical for selecting the right bearing unit for specific applications based on load requirements and operational conditions.
The document provides detailed technical specifications and descriptions of various Y-bearing units, focusing on flanged Y-bearing units with different housing materials and designs. It includes information on dimensions, tolerances, and load capacities, as well as specific product series and their applications.
The document lists various Y-bearing units with their respective dimensions, load ratings, and designations. It includes tables that specify the dynamic and static load capacities, permissible loads, and mass for different bearing units. The units are categorized by shaft size and housing type, such as composite, cast iron, and pressed steel.
The document describes the different designs of flanged Y-bearing units, including those with composite material housings, grey cast iron housings, and pressed steel housings. Each design is suited for specific applications, such as high contamination, high speed, or heavy load conditions.
The document outlines the standards for dimensions and tolerances of the housings, referencing ISO and JIS standards. It also discusses the radial internal clearance of the bearings and how it aligns with the housing to prevent turning while allowing for misalignment compensation.
Detailed product tables are provided, listing various combinations of Y-bearings and flanged housings. These tables include information on the series, dimensions, and specific features like grub screws or eccentric locking collars.
The document suggests using specific series for particular environments, such as the FYK and FYTBK series for challenging conditions without maintenance. It also highlights the importance of selecting the appropriate housing material and design based on the application's load and speed requirements.
Y-bearings are housed in various materials including composite, cast, and pressed steel. Composite housings are made from glass fibre reinforced polyamide 6 with a steel coil for stability. Bolt holes in FYK and FYTBK series are reinforced with zinc-plated steel inserts. Cast housings use grey cast iron EN-GJL HB195, while pressed steel housings are cold-rolled and zinc-coated for corrosion protection.
Composite and grey cast iron housings can handle the same dynamic and static loads as the Y-bearings. They are suitable for shock and variable axial loads. Pressed steel housings have lower load capacity, with axial loads not exceeding 20% of permissible radial loads. For shock or variable axial loads, grey cast iron or Y-TECH housings are recommended.
These housings have features for accurate positioning and relieving radial forces on attachment bolts. They can be attached using machined shoulders or washers.
Flanged Y-bearing units can be attached with threaded fasteners through reinforced bolt holes. Doweling is recommended for heavy loads, with dimples provided for dowel pin holes.
End covers are available for safety and protection, with designations and protrusion distances listed in product tables.
Standard units are filled with high-quality grease with a lithium-calcium thickener.
Mounting procedures depend on housing design and attachment method, detailed in the mounting instructions section.
Tables provide detailed dimensions, load ratings, and designations for various Y-bearing units, including those with square and oval flanges, and metric and inch shafts.
Catalog excerpts
Y-bearings and Y-bearing units
Open the catalog to page 1
® SKF is a registered trademark of the SKF Group. © SKF Group 2013 The contents of this publication are the copyright of the publisher and may not be reproduced (even extracts) unless prior written permission is granted. Every care has been taken to ensure the accuracy of the information contained in this publication but no liability can be accepted for any loss or damage whether direct, indirect or consequential arising out of the use of the information contained herein. PUB BU/P1 13728 EN ■ June 2013 This publication supersedes catalogue 06001 EN.
Open the catalog to page 2
From one simple but inspired solution to a misalignment problem in a textile mill in Sweden, and fifteen employees in 1907, SKF has grown to become a global industrial knowledge leader. Over the years we have built on our expertise in bearings, extending it to seals, mechatronics, services and lubrication systems. Our knowledge network includes 46 000 employees, 15 000 distributor partners, offices in more than 130 countries, and a growing number of SKF Solution Factory sites around the world. Research and development We have hands-on experience in over 40 industries, based on our employees’...
Open the catalog to page 4
research and development helps us keep our customers at the forefront of their industries. Meeting the toughest challenges Our network of knowledge and experience along with our understanding of how our core technologies can be combined helps us create innovative solutions that meet the toughest of challenges. We work closely with our customers throughout the asset life cycle, helping them to profitably and responsibly grow their businesses. Working for a sustainable future Since 2005, SKF has worked to reduce the negative environmental impact from our own operations and those of our suppliers....
Open the catalog to page 5
SKF – the knowledge engineering company Working closely with you Our objective is to help our customers improve productivity, minimize maintenance, achieve higher energy and resource efficiency, and optimize designs for long service life and reliability. Innovative solutions Whether the application is linear or rotary or a combination of the two, SKF engineers can work with you at each stage of the asset life cycle to SKF Life Cycle Management SKF Life Cycle Management is how we combine our technology platforms and advanced services, and apply them at each stage of the asset life cycle, to help...
Open the catalog to page 6
Bearings SKF is the world leader in the design, development and manufacture of high performance rolling bearings, plain bearings, bearing units and housings. Machinery maintenance Condition monitoring technologies and maintenance services from SKF can help minimize unplanned downtime, improve operational efficiency and reduce maintenance costs. Sealing solutions SKF offers standard seals and custom engineered sealing solutions to increase uptime, improve machine reliability, reduce friction and power losses, and extend lubricant life. Mechatronics SKF fly-by-wire systems for aircraft and drive-by-wire...
Open the catalog to page 7
This catalogue provides a representative overview of the range of Y-bearings and Y-bearing units available from SKF. The data in this catalogue is based on the latest standards and product upgrades. However, SKF reserves the right to make any changes necessary as a result of continuous improvement with respect to materials, design and manufacture. This catalogue contains all the data relevant to Y-bearings and Y-bearing units. All the data required to select a Y-bearing or Y-bearing unit respectively are listed in the product tables. Descriptions of the Y-bearing and Y-bearing unit types including...
Open the catalog to page 13
Quantity Length Area Volume Velocity, speed Mass Density Force Pressure, stress Moment Power Temperature Unit Conversion gallon gallon ounce pound short ton long ton 1 tonne 1,1023 short ton 1 short ton pound per 1 g/cm3 0,0361 lb/cub.in 1 lb/cub.in cubic inch square inch inch pound-force 1 Nm foot-pound per 1 W Celsius tC = 0,555 (tF - 32) Fahrenheit
Open the catalog to page 15
Principles of selection and application
Open the catalog to page 17
Conventional SKF ball bearing units are referred to as Y-bearing units. These units consist of: • an insert bearing (a single row deep groove ball bearing) with a convex sphered outside diameter • a housing, which has a correspondingly sphered but concave bore Y-bearing units can accommodate moderate initial misalignment, but normally do not permit axial displacement. They are ready-to-mount, ready-to-use units († fig. 1) and available as: • Y-bearing plummer block units • Flanged Y-bearing units • Y-bearing take-up units The housings are available in: • composite material († fig. 2) • grey cast...
Open the catalog to page 18
Because of their versatility and cost effectiveness, Y-bearing units are typically found in the following applications: agricultural machinery, construction equipment, conveyor systems, textile machines and fans as well as in machines for food and beverage processing and packaging. Bearing terminology For a better understanding of the information in this catalog, see the next two pages for frequently used bearing terms and their definitions for the following products: • Y-bearings V • Y-bearing plummer block units • Flanged Y-bearing units • Y-bearing take-up units Essentially, these terms...
Open the catalog to page 19
Y-bearings Insert bearings, wide inner ring bearings († fig. 5) 1 Outer ring 2 Sphered outer surface 3 Lubrication hole 4 Inner ring 5 Bore 6 Cage 7 Ball 8 Integral seal 9 Flinger 10 Eccentric locking collar 11 Grub (set) screw Inner ring with an eccentric locking collar Inner ring with two grub screws Inner ring with a tapered bore (on an adapter sleeve) Inner ring of a standard deep groove ball bearing
Open the catalog to page 20
Fig. 6 Y-bearing units Mounted ball bearing, unit ball Y-bearing plummer (pillow) block unit fig. 6a) 1 Y-bearing plummer block housing of grey cast iron 2 Housing base 3 Housing support face 4 Cast dimple for dowel pin 5 Attachment bolt hole 6 Y-bearing 7 Grease fitting 8 Recess for end cover 9 Filling slot for Y-bearing Flanged Y-bearing unit (^ fig. 6b) 1 Square flanged housing of grey cast iron 2 Attachment bolt hole 3 Back of flanged housing with or without centring recess 4 Cast dimple for dowel pin 5 Y-bearing 6 Grease fitting 7 Filling slot for Y-bearing 8 Recess for end cover Y-bearing...
Open the catalog to page 21All SKF AEROSPACE catalogs and technical brochures
ball bearings8 Pages
Self-aligning ball bearings2 Pages
SKF extends service2 Pages
