Matching End Caps to Tube Diameter and Shaft Size
End Cap Selection Based on Tube and Shaft Dimensions
End caps are selected using three dimensions: tube outside diameter, tube wall thickness, and shaft diameter. For example, a 30mm tube with 1.5mm or 1.8mm wall thickness and an 8mm shaft requires an end cap matching those exact values.
Matching Tube Outside Diameter and Wall Thickness
The tube outside diameter and wall thickness must be measured accurately. A mismatch here can cause the end cap to not seat properly or fail under load, especially when the roller is used in a conveyor system with frequent loading.
Shaft Diameter Determines End Cap Fit
The shaft diameter is critical for end cap compatibility. The end cap must match the shaft size exactly, such as 8mm or 12mm, to ensure secure mounting and proper rotation without wobble or slippage.
Hex Shaft Versions for Torque Transfer
Hex shaft versions are available for applications requiring torque transfer, such as motor rollers or driven systems. These end caps are designed to accept a hexagonal shaft and provide a positive drive connection.
Sprocket and Belt End Caps Require Shaft Size Matching
Sprocket, poly V, and O belt end caps are specified by shaft size, such as 12mm. The shaft must match the end cap’s bore size to ensure correct alignment and mechanical function.
Final Verification Before Ordering
Before placing an order, verify the tube outside diameter, tube wall thickness, and shaft diameter. Use these three dimensions to select the correct end cap from the available range.
Questions on This Topic
What dimensions do I need to specify for an end cap?
You need to specify tube outside diameter, tube wall thickness, and shaft diameter. For example, 30mm tube with 1.5mm wall and 8mm shaft.
Can I use a different wall thickness than listed?
No. The end cap must match the tube wall thickness exactly to ensure proper fit and load transfer.
Are hex shaft end caps available?
Yes. Hex shaft versions are listed and used where torque transfer is required.
What shaft size do sprocket or belt end caps use?
Sprocket, poly V, and O belt end caps are specified by shaft size, such as 12mm.
What happens if the shaft diameter is wrong?
A mismatched shaft diameter can cause the end cap to slip, wobble, or fail under load, leading to premature wear or system failure.
Apply This to Your Own Line
Send your dimensions and load figures and the matching catalogue models come back with a price.