Rectangular Bellows

Rectangular rubber bellows provide reliable protection for mechanical components subject to both axial motion and angular (polar) movement, such as in articulated joints or robotic arms. Unlike cylindrical bellows, the rectangular design allows for controlled lateral bending, making them ideal for protecting parts that follow complex or non-linear paths. Typical applications include robotic arms, actuators with rectangular geometry, cable carriers, and rotating supports for control panels or operator interfaces. The elastic rubber structure ensures resistance to dust, liquids, oils, and mechanical stress, preserving long-term flexibility and functional integrity. Custom design is available to match specific geometric and performance requirements, ensuring durability, protection, and reliability in demanding industrial environments.

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Description

Main advantages of rectangular bellows:

– Complete protection of guides, screws, and moving parts from dust, chips, and liquids
– Excellent resistance to wear and continuous flexing
– Adaptable to various dimensions and stroke lengths
– Easy to install and replace
– Available in different rubber 
– Custom-made designs available

 

Code B1
(mm)		 H1
(mm)		 L1
(mm)		 B2
(mm)		 H2
(mm)		 L2
(mm)		 MAX lenght
(mm)		 Lenght CLOSED
(mm)
SOF RET P 33 55 10 36 57 10 230 105
SOF RET M 35 114 9 35 114 9 240 200
SOF RET G 46 175 0 60 195 10 300 70
SOF RET 300 280 300 20 305 300 15 400 180
SOF RET 370×370 368 368 15 368 368 15 250 170
SOF RET 14 30 14,5 14 30 14,5 180 180
SOF RET 60X120X120 58 118 20 98 118 20 280 125
SOF RET 85X200X100 86 202 19 86 202 19 240 70

Rectangular rubber bellows are an effective solution for protecting mechanical components exposed to dust, moisture, and contaminants. Thanks to their shape, they fit linear guides, actuators, and sliding systems that do not use circular sections. They also ensure continuous protection, even when the movement is fast or frequent. For this reason, they are widely used across different industrial sectors.

These bellows, also known as rectangular protection bellows, rubber rectangular bellows, or square rubber bellows, offer excellent mechanical resistance. The rubber material absorbs impacts, vibrations, and deformations without losing elasticity. In addition, the folded structure allows smooth extension and compression while avoiding friction and keeping the geometry stable. Various thicknesses and rubber compounds can be produced to meet different technical needs.

Another advantage is the high level of customization. Every application may require a specific profile, and therefore custom manufacturing ensures a functional and clean-looking protection. Material selection also plays a significant role. For example, EPDM compounds provide superior resistance to weather and UV exposure, while NBR is suitable for environments with oils and industrial fluids. Alternatively, silicone offers excellent thermal stability under extreme temperature conditions.

Rectangular bellows are also easy to install, and their maintenance is minimal. Moreover, their flexibility helps extend the lifespan of machinery and reduces the risk of failures. As a result, they represent a reliable and versatile protection system for many mechanical configurations, ensuring safe and uninterrupted operation.

Additional information

Materials

For over 50 years our research on all bellows and boots materials has been continually improved and tested onsite and even in customer laboratories in order to improve all aspects of performance.

Our bellows can today be produced of special materials, or standard materials such as NBR, EPDM, CR if cost is the primary concern.

The new compounds of today are a special mix of standard raw materials. They ensure that the bellows will last a long time, with good aesthetics and tolerance of a wide temperature range. Some materials are excellent for outdoor applications because they are resistant to degradation by exposure to the sun’s UV rays, while others are resistant to prolonged contact with mineral oils and greases.

For special applications, new molding technologies now allow for bellows production in more sophisticated materials such as: VMQ, Silicone, FKM, Viton, CR, Neoprene, and Chloroprene.
Availability

For urgent needs see our list of standard RECTANGULAR BELLOWS for which we already have the production mold.

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