When selecting fits, it is best to follow the recommendations of the manufacturer. While many of the applications are covered, you will still need to adjust to your specific use case.

As a rule, the rotating ring of the bearing requires an interference fit using the housing or the shaft. The fixed ring is usually a loose fit with the mating part.

24 Vdc electromechanical operator for intensive use | Suitable for gates installed on large posts | Tempered steel mechanical features to guarantee sturdiness and solidity | Operation guaranteed even in the event of a power supply failure through batteries | Amperometric sensor obstacle detection system to prevent crushing | Equipped with open and close limit switches | Option of adjustable wire unlock device that allows opening from the outside in the event of a power supply failure

Care must always be given when fitting up bearings but particular care must be taken with small or miniature bearings, as they can easily be damaged due to their smaller cross sections.

Bearing manufacturers such as SKF make recommendations and set requirements for designing bearing interfaces. I recommend visiting any one of these fantastic manufacturing sites for fit charts.

A: Transition fits are suitable for general machinery and medium-load applications where a balanced performance is required. They are often used in situations where neither a tight interference fit nor a loose slip fit is ideal.

An interference fit, also known as a press fit or friction fit, occurs when the shaft diameter is slightly larger than the bore of the bearing. This type of fit requires force to assemble the parts, often necessitating the use of presses or heating methods to expand the bearing or shrink the shaft for insertion. Once cooled or returned to room temperature, the parts create a tight bond due to the mechanical interference.

Integrated LCD display | Integrated 433.92 MHz 64-code receiver with 3 encoding systems (Advanced Rolling Code, Rolling Code, Fixed Code) | Removable terminal boards | Separate limit switch inputs for each motor | Open, close, and pedestrian inputs | Photocell inputs in opening-closing and in closing phases | Input for N.C. or 8K2 sensitive edge | Output for electric lock 12 Vdc | Output for configuration as gate open indicator, service light, second radio channel and photocell testing | Output for connecting flashing light | Autosetting of operating parameters | Separate electronic torque adjustment for each motor | Anti-crushing safety through amperometric detection and encoder management | Separate adjustable slowdowns for each motor in opening and closing phases | Advantouch system to configure parameters and manage radio transmitters | Number of maneuvers | Programming access password | Maintenance warning

A: Standard tolerances vary based on the specific application and industry standards. Generally, interference fits have negative tolerances (shaft larger than the bore), slip fits have positive tolerances (shaft smaller than the bore), and transition fits have tolerances that can be either slightly positive or negative. Refer to engineering tables and standards for exact tolerance values.

The fits reduce this play or leave it as designed depending upon the operating conditions and the objective of the design engineer, whatever meets the best operation for the application. In addition to the fitting of the bearings into the housing or onto the shaft, a preload can be applied to the axis of the bearing to limit the side movement or axial play.

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All manufacturers make recommendations for shaft and housing fits dependent upon the type of bearing specified. Pressing a bearing into its location may require special tooling and must be done to avoid damage to the bearing balls, races, and cage.View this SKF’s instructional video on installing bearings, as it demonstrates numerous ways to mount bearings.

A transition fit falls between an interference fit and a slip fit. It is designed to provide a compromise where the parts can be assembled with moderate force and retain some degree of security without the tightness of an interference fit or the looseness of a slip fit. Transition fits are often used when a precise balance between ease of assembly and secure fit is required.

Integrated LCD display | Integrated radio receiver 433.92 MHz 64 codes and 3 encoding systems (Advanced Rolling Code, Rolling Code, Fixed Code | Removable terminal boards | Separate limit switch inputs for each motor | Open, close, step-by-step and pedestrian inputs | Separate opening-closing and closing photocell inputs | Stop input | Input for N.C. or 8K2 sensitive edge | Encoder Input for 24 Vdc hydraulic motors | Output for 12 Vdc electric lock | 2 outputs configurable as open gate indicator, second radio channel, courtesy light, zone light or photocell testing, flashing light, open gate alarm, NC input alarm | Output for connecting flashing light | Autoset of operating parameters | Separate electronic torque adjustment for each motor | Separate electronic speed adjustment for each motor | Anti-crushing safety through amperometric detection and encoder management | Separate slowdowns for each motor in opening and closing phases | Set up for connection to KNX systems via X.BE card (optional) | Designed for managing, configuring, diagnosing and updating firmware through the BeUP app, using the PRO.UP accessory | Advantouch system to configure parameters and manage radio transmitters | Number of manoeuvres | Programming access password | Maintenance warning | Built-in battery charger

The application’s requirements will determine the bearing tolerance class needed. In the tables SKF provide information about bearing tolerances, seat tolerances, and resultant fits. You can use these tables to determine fit values. You can also use other manufacturers’ tables to estimate the engineering aspect for determining fits for your specific application. SKF, INA, FAG and others are focused on larger, more industrial bearings whereas NMB and NHBB are focused on smaller, lighter, and narrower width bearings.

A: A transition fit falls between interference and slip fits, providing a moderate fit where parts can be assembled with some force but are not as tight as an interference fit nor as loose as a slip fit. It offers a balance of security and ease of assembly.

In this step, bearing seats are especially important in determining performance. Bearing seats support the bearing’s circumference across the entire width of the raceway.

A slip fit is something that can be as easy to understand as pulling on a pair of socks. There is slight resistance when slipping the bearing bore over the shaft or the outer race into the housing.

A slip fit, also known as a clearance fit, occurs when the shaft diameter is slightly smaller than the bore of the bearing. This type of fit allows the parts to slide together with ease, requiring minimal or no force for assembly. Slip fits are suitable for applications where frequent assembly and disassembly are necessary.

A: An interference fit, also known as a press fit or friction fit, occurs when the shaft diameter is slightly larger than the bore of the bearing. This type of fit requires force for assembly, often involving pressing, heating, or cooling methods to achieve a tight, secure bond between the parts.

Bearings are manufactured with a certain amount of radial and axial play, also known as clearance. This free space in the bearing is where the ball in the raceways can move up, down, or sideways.

There is resistance between your foot and the sock. When tolerance differences are tight between the outer race and the housing or the inner race and the shaft, force is required to push the parts together.

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Before you arrive at picking the fits in a bearing you must follow these steps to get there. First you must determine the performance requirements and operating conditions. Only after selecting the bearing type, size, and lubrication and understanding operating temperature and speed can help correctly identify the fits needed.

A: A slip fit, or clearance fit, occurs when the shaft diameter is slightly smaller than the bore of the bearing. This allows the parts to slide together easily without significant force, making it suitable for applications requiring frequent assembly and disassembly.

A: The main advantages include high load capacity, reduced vibration and noise, and secure positioning of parts, making it ideal for heavy-duty applications where reliability and durability are crucial.

Pair of adjustable photocells with three positions, power supply 14÷30 Vac / 12÷30 Vdc | Option to mount 2 pairs close together without synchronization

Establishing accurate shaft and housing fits is essential to achieving the best possible bearing performance. Many issues occur in applications where fits are too loose or tight. Improper fits can cause excessive wear, poor bearing rotation, excessive vibration, noise, unwanted pre-load, overheating, and reduced radial play.

Bearings need to be able to operate in any environment and are precisely designed to fit on shafts and into housings to function efficiently.