Custom Design

Custom Design Contact

Please complete the form below filling out as much information as you can.
- Required Field
Technical Specs - fill in as much as possible
 Shaft Size: +/- (dia. range)
 Bearing Type:
 Installation Option:

 Rotary Speed:  rpm
 Wear Limit:
(wear limit applies only to certain plain bearing products)
Please attach your CAD Drawing:
(jpg or PDF < 4 MB)
Special Operating Environment - fill in as necessary
High or Low temperature exposure? Constant or peak? Exposure to corrosive materials or particulates?
Usage Specs - fill in as much as possible
Est. Annual Usage / Qty:
Do you need samples for evaluation? If yes, please specify a quantity.     Qty:  
Is this an existing application?
If yes, what is prompting the change?

Reason for change:

Shaft Size

This is the diameter of the shaft (in inch or metric units) being used with the bearing. Shaft size is generally determined by the torque and load requirements of the application. When faced with tight space constraints, it’s important to remember that the shaft diameter can be reduced when a higher strength shaft material is used.

When considering a plain bearing, be sure to think about all of the recommended shaft properties. If you need a shaft that is not round (square, hex, half-round, etc.), please contact Spyraflo customer service to see if a custom bearing is an option.

Self-Align / Non-Align

Self-aligning bearings allow the bore of the bearing to align +/- 5 °, or within the limits of the bearing assembly. This provides for ideal alignment resulting in optimum performance and operating efficiency. Spyraflo’s self-aligning bearings are designed to swivel with the shaft during assembly and then hold that optimum position. Self-aligning bearings are ideal when two bearings are used per shaft, and the bearings can align to one another.

Note that Spyraflo’s standard self-aligning bearings are not designed for dynamic self-alignment - where the bore is continually compensating for angular misalignment. If you need a bearing capable of dynamic self-alignment, please contact Spyraflo customer service to determine if a special design makes sense.

In contrast, non-aligning bearings maintain the position of the bore and do not allow the bore to swivel in relation to the shaft axis. Non-aligning bearings are often preferred where only one bearing is used per shaft or where self-alignment is not necessary. Non-aligning bearings are generally less expensive than self-aligning bearings because they require fewer parts.

Bearing Type (Plain / Rolling Element)

The two primary mechanical contact types of bearings are plain and rolling element.

Plain bearings consist of an engineered solid material that can not only support the load, but also allow for movement between surfaces that slide against one another. The plain bearing material has specific performance values which allow engineers to determine how the bearing will perform, and calculate operating limits and service life. Plain bearings often outperform rolling-element bearings in harsh environments, where high shock loads are present or in slow-speed, high-load applications. Plain bearings are also ideal for short-angle oscillation applications.

Rolling-element bearings are made from multiple moving rollers that allow the shaft to roll on balls, rollers or needles. Ancient civilizations knew that moving massive stones was easier when the load was rolling on logs. Modern engineering and material technology have taken this basic concept and created rolling elements, which eliminate sliding friction. The result is an incredibly low friction coefficient, and bearings capable of the broadest range of speeds and loads. Spyraflo offers two types of standard rolling-element bearings: needle roller and ball bearings. Ball bearings have an inner race that spins with the shaft. Needle bearings do not have an inner race and require a hardened shaft, which acts as the inner race, rolling in direct contact with the needle rollers.


Load refers to the amount of force transferred to the bearing by a shaft. All standard Spyraflo bearings are designed to support radial loads, but some can handle a degree of axial load as well. Radial loads apply forces perpendicular to the axis of the shaft. Axial, or thrust loads, apply forces parallel to the axis of the shaft. Load is created by combinations of forces present in the mechanism. Load examples include the weight of an object being moved, the weight of the shaft, load created by tensioning a chain or conveyor belt, the weight and inertia of a door, or the weight of a plate supported by linear bearings.

Motion (Rotating, Linear, Oscillating)

Spyraflo bearings are designed with three motion types in mind: rotating, linear and oscillating.

Rotating motion is rotation of the shaft within the bearing, or in some cases the bearing rotating around the shaft.

Oscillating motion is also rotary motion, but typically not a full revolution. If the oscillation angle is greater than 120° it’s usually safe to consider the motion as rotating. Special consideration should be given to short-angle oscillations.

Linear motion is when the bearing slides up and down or back and forth on a shaft, or the shaft slides up and down or back and forth on the fixed bearing. Some applications may have a combination motion where the bearing slides along the shaft (linear) and rotates simultaneously (rotary).


The speed, or velocity of an application is important for calculating the service performance of a bearing. Rotational speed is usually given as RPM or rotations per minute. Oscillating motion may be given as degrees of angular rotation over time or as a RPM equivalent. Linear speed is the stroke (length of linear travel) over time. Combinations of rotary and linear on the same bearing should be discussed with a Spyraflo Application Engineer.


All bearings wear but in different ways according to type. As a plain bearing wears, material is displaced. Wear is the amount of surface material gradually removed from the inner diameter over time. After the run-in period, wear is slow and constant. In contrast, a rolling element bearing will not show any appreciable wear until end of life where it will degrade very quickly.

Plain Bearings

Each application is unique and will require different limits. Although a wear limit may never actually be reached it still should be considered in evaluation. By calculating the PV rating and estimated bearing service life, the wear rate can be applied to find if a particular bearing is appropriate. For example, a precision instrument may only tolerate a very small amount of measurable wear whereas a simple hinged pivot may allow for a very large wear limit because the mechanical operation is not hindered by minute changes in shaft position.

If you need assistance please contact Spyraflo customer service.


Self-clinching is a permanent bearing installation method developed by Spyraflo. Self-clinching provides the lowest overall cost, smallest space requirement and the most robust installation.

Press Fit

Press fit bearings also provide for lowest overall cost and small space requirement but can be mounted into materials where self-clinching is not compatible or where replacement may be necessary.

Pillow Block

Traditional pillow block frame featuring Spyraflo bearing inserts. Good for mounting with simple tools and standard bolts or fasteners.

Flange Mount

Sheet metal flange with Spyraflo bearing inserts. The most compact of our mounted bearing options. Good for mounting with simple tools and standard bolts or fasteners.

Housing Flange

Traditional housing flange frame featuring Spyraflo bearing inserts. Good for mounting with simple tools and standard bolts or fasteners.

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