Cylindrical Bellows

Cylindrical rubber bellows are the most widely used solution for protecting components with axial movement, such as screw jacks, telescopic arms, hydraulic cylinders, and pneumatic cylinders. Their simple yet functional geometry ensures effective shielding against dust, dirt, liquids, and weather agents, extending the lifespan and efficiency of mechanical systems.

High-performance materials for long life
The compounds used in bellow production are the result of years of development and testing in both lab and field. The most common versions are made from ozone-resistant NBR, ideal for contact with oil and grease, and EPDM, suitable for outdoor environments exposed to UV, ozone, and weather. For demanding applications, high-performance elastomers such as VMQ (silicone), FKM (Viton), CR (neoprene), and other materials can be used to ensure chemical, thermal, and mechanical resistance.

Custom options for harsh environments
Cylindrical bellows can be customized with optional accessories to enhance their functionality:
Vent holes to compensate for internal volume changes
Filters for protection in contaminated environments
Steel rings to maintain shape under compression or vacuum
Clamping collars for secure attachment to structures

Thanks to their modular design and customizable compounds, cylindrical bellows adapt to a wide range of industrial sectors, ensuring long-term protection and consistent performance.

 

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Description

Cylindrical Rubber Bellows

Cylindrical rubber bellows are circular-section protective covers designed to shield shafts, spindles, rods and other rotating or linear-moving components. Barbieri Rubber has been producing molded cylindrical rubber bellows since 1963 using injection, compression and transfer molding, in standard catalog ranges and made-to-drawing, with custom diameters and compounds matched to the working environment.

For urgent needs see our modular bellows

Code Ø d1   (mm) Ø d2   (mm) L Open   (mm) L (resting)    (mm) L Closed (mm) Availability
SOF 02X24 2 7 30 24 15 NO
SOF 04X18 4 15,4 25 18 8,5 NO
SOF 04X45 4 10 48 45 35 NO
SOF 04X66 4 12 66 50 10 NO
SOF 04X70 4 11 100 70 50 NO
SOF 04X15 4 7 17 15 7 NO
SOF 05X57 5 18 70 57 35 NO
SOF 05X46 5 25 55 46 27 NO
SOF 05X16 5 8 18 16 7 NO
SOF 05X40 5 7 40 40 25 NO
SOF 05X45 5 10 55 42 15 NO
SOF 05X60 5 17 80 60 35 NO
SOF AMM 5,8 6,8 55 44 23 YES
SOF 06X48 6 17 74 48 55 NO
SOF 06X90 6 19 90 73 43 NO
SOF 07X32 7 16 32 27 15 NO
SOF 07X52 7 16 57 52 45 NO
SOF 07X25 7 14 30 25 12 NO
SOF 07X33 7 25 40 33 12 YES
SOF 08X50 8 20 52 50 17 NO
SOF 08X57 8 20 57 57 32 NO
SOF 09X58 9 17 65 58 27 NO
SOF 09X25 9 24 25 25 15 NO
SOF 09X36 9 11 40 36 28 NO
SOF 09.5X36 9,5 11 40 36 28 NO
SOF 09.5X65 9,5 26 65 58 32 NO
SOF 10X20 10 22 21 20 9 NO
SOF 10X270 10 20 320 270 110 YES
SOF 10X38 10 20 45 36 15 NO
SOF 10X40 10 10 50 40 20 NO
SOF 10X86 10 10 90 86 70 NO
SOF 10X36 10 10 40 36 17 NO
SOF 10X90 10 10 110 90 35 NO
SOF 14X62 10,5 32 68 62 32 YES
SOF 11X47 11 35,5 50 47 25 NO
SOF 11X80 11 25 90 80 40 NO
SOF 11X87 11 25 130 77 20 NO
SOF 12X30 12 16 40 30 16 NO
SOF 12X27 12 20 40 27 14 YES
SOF 12X28 12 20 32 28 7 NO
SOF 12X32 12 23 32 22 12 NO
SOF 12X70 12 55 85 70 28 NO
SOF 14X19 14 18 100 80 65 YES
SOF 14X54 14 33 55 54 30 NO
SOF 14X65 14 50 70 65 48 NO
SOF 14X73 14 33 75 73 40 YES
SOF 15X45 15 30 60 45,5 16,5 YES
SOF 15X74 15 33,5 90 78 32 NO
GAL SOF 28172 15 29 28 26 21 YES
SOF 15X95 15 15 110 95 45 NO
SFT.ECO 15 15 120 100 40 NO
SOF 16X14 17 21 17 16,5 14 NO
SOF 16X20 16 22 20 19,5 9 NO
SOF 16X36 16 48 36 36 36 NO
SOF 16X57 16 38 70 57 35 NO
SOF 16X87 16 21 125 87 50 NO
SOF 16X163 16 30 175 163 70 NO
SOF 16X126 16 28 200 126 85 NO
SOF 17X55 17 23 80 55 33 NO
SOF 17X103 17 17 120 103 32 NO
SOF 17X140 17 37 170 140 25 NO
SOF 18X57 17,5 26 57 57 40 NO
SOF 18X134 18 54 210 134 70 NO
SOF 40X70 18 33 85 65 27 NO
SOF 01/A 19 19 40 28 16 NO
SOF 19X19 19 19 20 19 13 NO
SOF 19X20 19 20 19 20 18 NO
SOF 19X70 19 32 110 70 25 NO
SOF 19X90 19 32 160 90 30 NO
SOF 20X40 20 64 60 40 12 NO
SOF 20X85 20 46 85 85 50 NO
SOF 20X110 20 100 130 110 17 NO
SOF 20X100 20 20 150 100 50 NO
SOF 20X130 20 27 130 77 50 YES
SOF 20X94 20 28 190 94 50 NO
SOF 20X155 20 20 200 155 75 NO
SOF 20X215 20 32 300 215 90 NO
SOF 21X40 21 32 45 40 24 NO
SOF 21X125 21 32 125 120 55 NO
SOF 21X113 21 30 160 113 55 NO
SOF 22X58 22 22 60 58 53 NO
221/SFTALG 22 24 160 122 50 NO
SOF 22X125 22 32 170 125 60 NO
SOF 22X140 22 18 170 140 45 NO
SOF 22X185 22 30 190 180 90 NO
SOF 22X239 22 29 239 200 159 NO
SOF 23X215 23 95 250 215 60 NO
SOF 24X93 24 24 105 93 65 NO
SOF 24X100 24 24 100 80 34 NO
SOF 24X145 24 33 175 145 85 NO
SOF 25X23 25 25 40 23 15 NO
SOF 25X70 25 25 100 70 35 NO
SOF 25X175 25 25 230 175 46 NO
SOF 25X155 25 40 190 150 40 NO
SOF 26X66 26 26 75 66 37 NO
SOF 26X90 26 54 100 90 60 NO
SOF 26X70 26 49 90 70 50 NO
SOF 26X110 26 86 125 110 45 NO
SOF 26X90X52 26 52 200 90 50 NO
SOF 27X104 27 27 105 104 85 NO
SOF 27X170 27 27 260 170 55 NO
SOF 22X104 28 30 180 104 55 NO
SOF 28X120 28 30 130 120 110 NO
SOF 28X140 30 33,5 180 133,6 50 NO
SOF 28X160 30 33 200 157 90 NO
SOF 29X60 29 32 60 60 20 NO
SOF 29X55 29 29 70 55 26 NO
SOF 29X78 29 70 100 78 50 NO
SOF 29X150 29 72 200 150 25 NO
SOF 30X79 30 64 85 79 40 NO
SOF 30X68 30 45 90 68 45 NO
SOF 30X70 30 49 90 70 50 NO
SOF 30X135 30 30 157 135 57 NO
SOF 30X155 30 30 210 155 85 NO
SOF 30X130 30 45 210 130 55 NO
SOF 30X164 30 30 220 164 70 NO
SOF 30X170 30 30 280 180 45 NO
SOF 30X182 30 30 250 182 60 NO
SOF 30X210 30 30 340 210 90 NO
SOF 31X51 31 35 62 51 24 NO
SOF 32X70 32 32 71 70 50 NO
SOF 32X26 31,5 31,5 30 25,5 17 NO
SOF 32X85 32 32 100 85 35 NO
SOF 32X170 32 32 290 170 100 NO
SOF 32X200 32 47 300 200 140 NO
SFTC 30/140 33 33 200 145 90 NO
SOF 33X149 33 45 270 149 40 NO
SOF 33X200 33 35 290 200 65 NO
SOF 33.5X180 33,5 33,5 250 180 115 YES
EL 0013 34 35 140 100 33 YES
SOF 34X122 34 34 210 144 60 YES
SOF 35X164 35 35 220 164 70 NO
SOF 35X140 35 35 230 140 45 NO
SOF 35X186 35 43 260 186 85 NO
SOF 35X230 35 35 354 230 84 NO
SOF 36X92 35,5 49 115 92 42 NO
SOF 36X81 36 52 120 81 30 NO
SOF 36X190 36 41 195 190 85 NO
SOF 36X180 36 41 200 180 80 NO
SOF 36X193 36 36 223 193 80 NO
SOF 36X184 36 40 250 184 90 NO
SOF 37X78 37 56 145 78 35 NO
SOF 37X125 37 41 215 125 65 NO
SOF 38X55 38 40 58 55 25 NO
SOF 38X62 38 38 83 62 30 NO
SOF 38X85 38 38 100 85 45 NO
SOF 38X150 38 68 235 150 37 NO
SOF 39X137 39 52 160 137 70 NO
SOF 39X155 39 39 220 155 85 NO
SOF 39X200 39 39 320 200 95 NO
SOF 40X180X60 39 39 240 170 60 NO
PRO SOF 41 40 50 130 110 78 YES
SOF 40X90 40 45 140 90 50 NO
SOF 40X120 40 48 200 120 50 NO
SOF 40X135 40 73 240 135 60 NO
SOF 40X92 40 40 210 92 42 NO
SOF 40X210 40 40 300 210 70 NO
SOF 40X230 40 55 450 230 95 NO
SOF 40-52X300 40 52 370 300 100 YES
SOF 40X380 40 60 380 300 110 NO
SOF 41X162 41 41 168 162 125 NO
SOF 41X118 41 41 122 118 105 NO
SOF 42X91 42 61 145 91 50 NO
SOF 42X90 42 55 150 90 25 NO
SOF LAV P 43 43 280 220 90 YES
SOF 44X96 44 55 120 96 30 NO
SOF 45X45 45 45 50 45 27 NO
SOF 45X65 45 60 80 65 40 NO
SOF 45X97 45 45 101 97 60 NO
SOF 45X145 45 45 140 100 60 YES
SOF 45X126 45 45 190 126 70 NO
SOF 45X180 45 45 250 180 70 NO
SOF 45X210 45 60 290 210 90 NO
SOF 45X220 45 45 290 220 70 NO
SOF 47X120 47 65 150 120 45 NO
SOF 48X102 48 83 207 102 40 NO
SOF 48X85 48 48 80 70 25 NO
SOF 48X60 48 69 90 60 30 NO
PRO SOF 48 48 61 110 90 55 NO
PRO SOF 375 48 61 110 100 65 NO
SOF 48X280 48 48 450 280 170 NO
SOF 49X102 49 49 102 102 80 NO
SOF 49X86 49 75 95 86 56 NO
SOF 49X320 49 49 520 320 170 NO
SOF 50X130 50 50 140 130 40 NO
SOF 50X170 50 74 210 170 75 NO
SOF 50X150 50 50 240 180 120 NO
SOF 50X210 50 50 280 210 70 NO
SOF 50X140 50 63 295 140 68 NO
SOF 51X210 51 51 280 210 60 NO
SOF 52X78 52 52 110 78 40 NO
SOF 52X195 52 52 240 195 100 NO
SOF 52X160 52 60 260 160 90 NO
SOF 53X140 53 90 300 140 80 NO
SOF 53.5X235 53.5 90 300 235 110 NO
SOF 54X180 54 54 400 180 95 NO
SOF 55X60 55 60 60 60 30 NO
SOF 55X210 55 55 280 210 70 NO
SOF 55X240 55 70 400 240 120 NO
SOF 56X140 56 64 170 140 75 NO
SOF 58X105 58 58 110 105 85 NO
SOF 58X140 58 58 150 140 100 NO
SOF 58X138 58 58 180 138 50 NO
SOF 60X120 60 66 125 120 95 NO
SOF 60X132 60 60 170 132 55 NO
SOF 60X210 60 60 310 210 80 NO
SOF 60X300 60 70 450 300 90 NO
SOF 62X150 62 62 200 150 56 NO
SOF 64X125 64 82 160 125 55 NO
SOF 64X95 64 84 160 95 50 NO
SOF 65X210 65 65 310 210 80 NO
SOF 66X88 66 75 140 88 25 NO
SOF 67X56 67 77 70 60 32 NO
SOF 70X80 70 70 83 80 70 NO
SOF 70X150 70 70 250 150 75 NO
SOF 70X210 70 70 320 210 85 NO
SOF 70X240 70 70 400 240 120 NO
SOF 70X290 70 70 450 290 80 NO
SOF 71X38 71 71 50 38 20 NO
SOF 72X120 72 90 120 120 120 NO
SOF 72X105 72 72 210 105 40 NO
SOF 73X34 73 73 55 34 30 NO
SOF 73X77 73 73 110 77 35 NO
SOF 75X200 75 100 300 200 100 NO
SOF 75X210 75 75 340 210 75 NO
SOF 76X106 76 76 170 106 30 NO
SOF 80X210 80 80 320 210 100 NO
SOF 80X240 80 80 340 240 110 NO
SOF 80X230 80 80 350 230 60 NO
SOF 81X85 81 81 110 85 32 NO
SOF 85X75 85 85 130 75 37 NO
SOF 85X150 84 84 180 153 90 NO
SOF 85X170 85 85 260 170 87 NO
SOF 85X210 85 85 330 210 85 NO
SOF 85X285 85 85 445 285 70 NO
SOF 89X62 89 105 190 62 26 YES
SOF 90X80 90 90 100 80 30 NO
SOF 90X88 90 90 180 88 50 NO
SOF 90X210 90 90 350 210 80 NO
SOF 91X175 91 91 360 120 50 YES
SOF 92X87 92 118 215 87 45 NO
SOF 95X105 95 95 210 105 55 NO
SOF 95X230 95 95 350 230 90 NO
SOF 100X88 100 173 138 70 46 NO
SOF 100X90 100 100 120 90 55 NO
SOF 100X95 100 100 190 95 60 NO
SOF 100X107 100 100 220 107 60 NO
SOF 100X210 100 100 330 210 85 NO
SOF 200X103 103 103 290 180 100 NO
SOF 200X110 110 110 280 160 100 YES
SOF 110X225 110 110 360 225 95 NO
SOF 115X70 115 160 120 70 45 NO
SOF 120X45 120 165 65 45 25 NO
SOF 120X86 120 250 90 86 70 NO
SOF 120X170 114 114 250 170 80 NO
SOF 120X235 120 120 400 235 100 NO
SOF 127X185 127 127 240 185 75 NO
SOF 128X260 128 238 400 250 100 NO
SOF 129X95 129 129 200 95 50 NO
SOF 130X100 130 130 150 100 70 NO
SOF 130X235 130 130 400 235 100 NO
SOF 137X310 137 137 500 310 130 NO
SOF 140X102 140 140 160 102 60 NO
SOF 140X95 140 176 170 95 50 NO
SOF 150X120 150 150 145 120 65 NO
SOF 150X140 150 180 260 140 80 NO
SOF 150X150 150 194 160 150 100 YES
SOF 150X300 150 150 530 300 120 NO
SOF 154X180 154 170 300 180 75 NO
SOF 160X70 160 170 90 70 45 NO
SOF 160X330 160 190 330 220 75 NO
SOF 180X75 180 220 140 75 58 NO
SOF LAV G 183 200 100 88 40 YES
SOF 210X200 210 210 350 200 65 NO
SOF 260X600 260 280 600 230 100 NO

What cylindrical rubber bellows are for

Circular-section rubber protective bellows perform three main functions: retaining lubricant near moving parts, preventing dust, dirt, swarf and aggressive fluids from entering, and absorbing small axial and radial oscillations. The most common application is spindle protection: the cylindrical rubber spindle bellows wraps the rotating body and flexes axially following the working strokes. The same cylindrical shaft boots are used on pneumatic and hydraulic rods, on universal joints and on sliding couplings.

Available compounds and technical properties

Compound selection depends on operating temperature, chemicals in contact and lubricant type. We supply circular rubber bellows in the main families of technical elastomers, with typical hardness between 40 and 80 Shore A.

Compound Temperature range Chemical resistance Typical applications
NBR (Nitrile) -40 / +130 °C Mineral oils, fuels Hydraulics, automotive
EPDM -40 / +100 °C Water, steam, ozone, UV Outdoor, industrial hydraulics
VMQ (Silicone) -60 / +200 °C High temperatures, biocompatible Food, medical, high-T
FKM (Viton®) -10 / +180 °C Aggressive oils, solvents, fuels Chemical, performance automotive
HNBR -20 / +160 °C Oils + high temperature Heavy-duty hydraulics

 

Standard, made-to-drawing and custom diameters

The Barbieri Rubber catalog covers a wide range of standard diameters and typical working heights. For non-standard sizes we manufacture custom-diameter rubber bellows starting from the drawing supplied by the customer, even at preliminary level: at least a draft drawing is always required for any custom production. Our engineering office checks moldability and recommends the most suitable compound; the dedicated mold is then built in cooperation with our trusted toolmaking partners, while the cylindrical bellows molding remains fully in-house. We produce circular-section rubber bellows with sealing collars sized for precise mating and inner surfaces engineered to avoid wear on the protected component. For small dimensional variants on standard geometries we offer cost-effective solutions.

Industrial applications

Cylindrical rubber bellows are used in: hydraulics (rod and cylinder protection), pneumatics (rods and actuators), automotive (joints, linkages, suspensions), agricultural machinery (exposed rotating parts), garage equipment and joystick controls, industrial hydraulics. For every sector we propose compound and geometry consistent with service-life targets, operating temperature and applicable standards.

Frequently asked questions

What is a cylindrical rubber bellows?

A round collar bellows is a tubular elastic element with a circular cross-section and a corrugated outer surface, used to protect shafts, rods and spindles from dust, dirt and lubricant loss. The accordion shape lets the bellows extend and compress to follow the movement of the protected component.

Which compound should I choose for cylindrical bellows?

Selection depends on the operating environment. NBR is the most common for contact with mineral oils in hydraulics and automotive. EPDM suits exposure to water, steam, ozone and UV. Silicone (VMQ) covers the widest temperature range, from -60 to +200 °C. FKM (Viton®) resists aggressive oils, solvents and fuels.

Can I order custom cylindrical rubber bellows?

Yes. We produce custom cylindrical rubber bellows starting from the drawing supplied by the customer, even preliminary: at least a draft drawing is always required for any custom production. The dedicated mold is built in cooperation with toolmaking partners; compound and hardness are selected based on application specifications.

What is the difference between cylindrical and modular bellows?

The cylindrical bellows has a constant circular cross-section with regular convolutions, ideal for protecting spindles and rotating shafts. The modular bellows is built from assembled elements and covers variable lengths and diameters, suitable for telescopic guides with irregular strokes. For round rotating parts the cylindrical bellows is almost always the preferred choice.

Which sectors use circular rubber bellows?

Circular rubber bellows are used in oil hydraulics, pneumatics, automotive, agricultural machinery, garage equipment, joystick controls, industrial hydraulics and photovoltaic systems. Barbieri Rubber supplies standard catalog bellows and made-to-drawing productions for B2B applications worldwide since 1963.

Additional information

Restrictions and relative solutions

Correct dimensions

The dimensions of the bellow must be chosen accurately in order not to reduce its durability and to have an eye-pleasing result.

The collars are made of elastic rubber as is the bellow. Therefore, the entire diameter must be smaller than the diameter on which they will be installed (fitted). We recommend choosing them 3-10% smaller than the latter diameter.

The length of the bellow must be sufficient when the device is closed and when it is open, taking into consideration the position and length of the collars.
FOR A PROPER SELECTION OF BELLOWS:

Rubber is elastic, so the collars can widen up to 10-15% of their diameter, see the table below.

It is always better to choose a smaller bellows collar, at least 3% less than the diameter on which must be fitted. The drawing shown below is standard, but many of the bellows in the table do not have an exactly similar geometry, always ask for the specific drawing.
Check the correctness of the internal diameter.
Check if there are no encumbrances for the external diameter.

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