Protective Bellows for
Hiwin EG & HG Guideways

Toll Free: 877-444-6789 | Tel: 704-639-0710 | Fax: 704-639-9866
P.O. Box 3502 | Salisbury, NC 28145   USA



Copyright © 2005-2016
Automation 4 Less


If you want to protect your Hiwin EG or HG linear bearings and rail from dust, dirt and other contaminants, we now have the perfect solution! Automation 4 Less offers 3-sided custom bellows produced in about two weeks for your EXACT application.

  • Eazy to size for your project. Just a few measurements required.
  • Simple to install.
  • Affordably priced.
  • Extend the life of bearings and rail and reduce maintenance.
  • Work with Hiwin EG 15-30 sizes and HG 15-65 sizes.


Will these bellows work with other linear guideway brands?
No, they will not. These products are produced with internal "stiffeners" that closely match the profile of the Hiwin rail. They are not compatible with THK, Bosch/Rexroth/Star, INA or any other brand.

What type of protection do these bellows offer?
This design covers three sides of the rail. They are great for blocking out dust, dirt, grit and other particles. They will also ward off some liquid spray, but since they don't totally encapsulate the rail, they're not recommended for water jet or other direct spray applications. While the materials of construction are quite durable and resistant to heat, very hot debris produced by welding or plasma torch can cause the bellows to fail prematurely. Alternate high-temperature construction is available.

How are these installed?
It's actually very easy. If you view the photos above, you'll see that ends are preformed. The bearing end has a molded-in adapter that fastens via bolts that are positioned to match the Hiwin factory locations for bearing end cap fasteners. Simply remove the factory bolts, then attach the bellows to the same holes using slightly longer bolts (supplied with the bellows kits). For the end that attaches to the rail, a few holes must be drilled and tapped into the end of the rail. While rail is hardened in its outer surface "wear" areas, it is NOT hardened where the rail has been cut (which is where you must drill and tap). Bolts secure the bellows in the drilled/tapped holes.

How do I determine how to size and price these for my application?
If you understand a few terms, you can gather the information that will enable us to quote. The drawing (right) should be helpful.

If you are retrofitting an existing linear guideway, you first measure the overall length of your rail. In addition, we'll need to know what part of the rail will NOT be covered by bellows. The term for this is the "table length." Generally speaking, this is the measure of the length of any bearings installed on the rail plus any distance between them. In the illustration, it's the length of bearing A, the length of bearing B and the space between them, C. You may have only one bearing installed on your rail. If that's the case, then your table length will simply be the measure of the length of that single bearing. Note that bellows, when compressed, do take up a bit of room. That will reduce the overall stroke/movement of your linear carriages because they won't be able to travel as far towards the rail ends. We can make some calculations and tell you how much your stroke will be reduced when you install bellows on an existing machine.

If you are dealing with a new machine, you would probably want to take a slightly different approach. In this case, if you know how much table movement you require, we can assist you in determining how long your rail would need to be to accommodate that and the bellows. Tell us the desired stroke. Tell us your table length. From that, we can tell you how long your rails need to be and the measure of the bellows...and price both of those for you!

How many bellows are needed to cover a rail?
Generally speaking, the answer is two sets. Bellows cover the rail between the "table" and the two ends of the rail. The bellows must be able to extend from the anchor point at the rail end to where the table is moved to its greatest distance away from that end. Bellows must also compress in as small an area as possible so as to minimize the restriction of stroke movement. What we do is calculate the exact number of folds required for the job. You want the fewest bellows to extend to the maximum length called for. At the same time, you want the fewest folds so that when compressed, the least space is occupied.

Would you like a price quote? Click here for our simple information form.


Bellows Part #
Fits Hiwin series...
Each file 1-pg.
& approx. 43 kb
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