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At Thomson we offer a number of pre-assembled round rail linear guide assemblies. These assemblies are made from the same components that are available separately. When sold as an assembly some of the components on inch sized products are black anodized but they have the same dimensions and performance of the standard components.
Benefits of a Linear Guide are that it:
Requires only one part number to specify entire linear guide. No worries about component compatibility or forgetting a component.
Comes assembled ready to install.
Single vs Twin pillow blocks
maintain alignment round rail linear guides need to have two bushings per
rail. The two bushings
can either be in one or two pillow blocks. When there are two bushings in one
pillow block we call it a "twin" pillow block. If there is one bushing
per billow block
it is called a "single" pillow block. The assemblies are available
either one twin or two single pillow blocks. When comparing the two it easy
to see which one is the twin pillow block as it is noticeably longer
than a single pillow block. In the image below on the left are two single
pillow blocks (1 bushing per block) and on the right is one twin pillow
block (2 bushings inside the block).