The cylindrical rubber pads with through hole are elastic discs made of natural rubber (NR) or chloroprene (CR) with a central hole, used as spacers, supports and damping pads in assemblies with a through bolt or pin. Larosi offers them in 163 codes and 149 different sizes, from Ø 8.3 to 290 mm outer diameter and from 3.5 to 300 mm height: the widest range in Europe. A wide choice of sizes allows you to find the right pad without modifying the assembly, with fast shipping from Padua.
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Circular elastic elements designed to absorb shocks, damp vibrations, reduce noise transmission and ensure effective isolation between mechanical components, machinery and structures. They are also called rubber anti-vibration spacer washers with through hole.
What are cylindrical rubber pads with through hole
The cylindrical rubber pad with through hole is a simple elastic element: a rubber cylinder with an axial through hole. The hole allows it to be fixed with a bolt or pin, slipped onto a shaft or centred in a housing. Three dimensions define it: D, outer diameter; d1, hole diameter; h, height. Under load the rubber works mainly in compression and, by deforming, absorbs shocks and dampens the vibrations that would otherwise be transmitted to the structure.
Advantages of cylindrical rubber pads
- Elasticity and damping: the rubber absorbs shocks and reduces vibrations and noise.
- Quick assembly: just a through bolt or pin is needed.
- Wide choice of sizes: 163 codes, 149 different sizes and 47 outer diameters.
- Compounds: natural rubber (NR) from 40 to 60 Shore and chloroprene (CR) 70 Shore for different requirements.
- No lubrication: the elastic element requires no maintenance.
Available compounds: NR and CR
| Compound | Codes | Outer Ø D (mm) | Hole Ø d1 (mm) | Height h (mm) |
|---|---|---|---|---|
| NR 55 Shore | 91 | 8.3 – 250 | 3.2 – 70 | 3.5 – 200 |
| CR 70 Shore | 43 | 16 – 100 | 6.5 – 21 | 12 – 125 |
| NR 40/60 Shore | 29 | 37 – 290 | 14 – 135 | 30 – 300 |
NR 55 Shore (natural rubber). Excellent elasticity and good damping; it is the compound used for most of the range. It is not suitable for prolonged contact with oils, fuels and solvents or for continuous exposure to ozone and weathering.
CR 70 Shore (chloroprene). Harder than NR 55 Shore, therefore less compliant for the same size. It offers better resistance to ozone, ageing and weathering and provides fair resistance to mineral oils.
NR 40/60 Shore (natural rubber). The same natural rubber as NR 55 Shore, available in a hardness range from 40 to 60 Shore, including softer grades: in the list it covers sizes from Ø 37 to 290 mm. For the same size a lower hardness gives a more compliant pad; the same limitations regarding oils and weathering apply.
Sizes of cylindrical rubber pads with through hole
The article code shows the three dimensions followed by the compound. Example: D2510,520NR = D 25 mm, d1 10.5 mm, h 20 mm, NR; in the description the same article is indicated as 25/10.5-20.
| Article code | Description D/d1-h | D (mm) | d1 (mm) | h (mm) | Compound |
|---|---|---|---|---|---|
| D8,33,23,5NR | 8.3/3.2-3.5 | 8.3 | 3.2 | 3.5 | NR 55 Shore |
If the size you need is not in the catalogue, we can also supply non-catalogue sizes: contact us.
Applications of cylindrical rubber pads
- Elastic spacers and shims between metal parts, to avoid direct contact and damp vibrations.
- Bump stops and buffers for end-of-travel, doors and moving parts.
- Anti-vibration mounts for small machines, motors, pumps and equipment.
- Elastic isolation of panels, tanks and housings.
- Thick elastic washers for through bolts.
cylindrical rubber pads with through hole
The cylindrical rubber pads with through hole are elastic discs made of natural rubber (NR) or chloroprene (CR) with a central hole, used as spacers, supports and damping pads in assemblies with a through bolt or pin. Larosi offers them in 163 codes and 149 different sizes, from Ø 8.3 to 290 mm outer diameter and from 3.5 to 300 mm height: the widest range in Europe. A wide choice of sizes allows you to find the right pad without modifying the assembly, with fast shipping from Padua.
Product In-Stock: InStock
How to choose the right cylindrical rubber pad
- Diameter and height. They determine stiffness: for the same compound, a low and wide disc is stiffer than a tall and narrow one. For a perforated disc in compression the shape factor is approximately (D − d1) / (4 × h): the higher it is, the stiffer the pad.
- Hole. Choose d1 according to the diameter of the bolt or pin, leaving the necessary clearance for centring.
- Compound. Higher hardness corresponds to lower deformation under the same load. For outdoor environments or possible contact with light oils consider CR.
- Load. Do not compress the pad beyond the working range provided by the design.
If in doubt, our technical department is available to help you choose the correct code.
Why choose Larosi
Larosi Srl has been based in Padua since 1970 and manages a warehouse with over one million industrial spare parts. With 149 different sizes (163 codes), Larosi’s catalogue of cylindrical rubber pads is the widest range in Europe, recently expanded with new sizes and hardnesses. Orders received by 11:00 a.m. are shipped the same day for the most common sizes.
See also: Anti-vibration mounts · Cylindrical anti-vibration mounts · Hollow rubber springs
Frequently asked questions
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