Mackay M11202540 20 x 25 mm Duro 40 Multicushion Isolator Stainless Steel
Available
The Mackay stainless steel Multicushion is the Multicushion cushion isolator made from high-grade natural rubber with stainless steel (type 304) metal components, in the most popular sizes (manufacturer-stated). It comes in two rubber hardnesses, Duro 40 and Duro 55, and the cushions are supplied without fixing studs (manufacturer-stated).
This listing covers 20 part numbers: 10 diameter and height combinations from 20 x 25 mm to 50 x 45 mm, each in Duro 40 and 55, with M6, M8 and M10 threads. The maximum compression load runs from 30.5 kg (20 x 25 mm, Duro 40) to the 50 x 35 mm Duro 55 part, which the two Mackay catalogues show as 270 or 264 kg.
Mackay recommends fixing these cushions with stainless steel hexagonal socket set screws used with an appropriate locking compound (manufacturer-stated).
Where this product is used
- Fixing with stainless steel hexagonal socket set screws and an appropriate locking compound, as Mackay recommends (manufacturer-stated).
- Equipment that needs stainless steel (type 304) metal components on the cushion (manufacturer-stated).
- Corrosive environments or solvents, after confirming with Mackay Technical staff that natural rubber is suitable (manufacturer-stated).
Features
- Metal components are stainless steel (type 304) (manufacturer-stated)
- Made from high-grade natural rubber (manufacturer-stated)
- Available in two rubber hardnesses, Duro 40 and Duro 55 (manufacturer-stated)
- Supplied without fixing studs (manufacturer-stated)
- Mackay recommends stainless steel hexagonal socket set screws with an appropriate locking compound (manufacturer-stated)
- Consult Mackay Technical staff to confirm natural rubber is suitable for corrosive environments or solvents (manufacturer-stated)
- Not recommended for permanent tension loading; apply the load to the full face and not just the thread (manufacturer-stated)
Common specifications
| Specification | Detail |
|---|---|
| Part numbers | 20 (10 diameter and height combinations in two Duro) |
| Diameter (A) | 20 to 50 mm |
| Height (B) | 20 to 45 mm |
| Hardness (Duro) | 40 and 55 |
| Colour code | 40 red, 55 yellow |
| Thread (C, metric) | M6, M8 and M10 |
| Metal components | Stainless steel (type 304) |
| Maximum compression deflection | 2.5 to 8 mm |
| Maximum shear deflection | 3 to 10 mm |
| Weight | 0.02 to 0.16 kg |
Key specifications
| Mackay part number | Diameter A (mm) | Height B (mm) | Duro | Thread C | Max compression load (kg) | Max compression deflection (mm) | Max shear load (kg) | Max shear deflection (mm) | Weight (kg) |
|---|---|---|---|---|---|---|---|---|---|
| M11202540 | 20 | 25 | 40 | M6 | 30.5 | 6 | 5 | 6 | 0.02 |
| M11202555 | 20 | 25 | 55 | M6 | 65 | 6 | 11 | 6 | 0.02 |
| M11252040 | 25 | 20 | 40 | M6 | 36 | 2.5 | 7 | 3 | 0.02 |
| M11252055 | 25 | 20 | 55 | M6 | 54 | 2.5 | 12 | 3 | 0.02 |
| M11253040 | 25 | 30 | 40 | M6 | 41 or 55 (catalogues differ) | 8 | 7 or 10.5 (catalogues differ) | 8 | 0.03 |
| M11253055 | 25 | 30 | 55 | M6 | 75 or 98 (catalogues differ) | 8 | 13 or 19 (catalogues differ) | 8 | 0.03 |
| M11302040 | 30 | 20 | 40 | M6 | 34.5 or 42 (catalogues differ) | 2.5 | 8 | 3 | 0.03 |
| M11302055 | 30 | 20 | 55 | M6 | 62 | 2.5 | 13 | 3 | 0.03 |
| M11303040 | 30 | 30 | 40 | M8 | 44 | 4 | 10 | 5 | 0.05 |
| M11303055 | 30 | 30 | 55 | M8 | 77 | 4 | 18 | 5 | 0.05 |
| M11304040 | 30 | 40 | 40 | M8 | 49.5 | 8 | 9 | 10 | 0.06 |
| M11304055 | 30 | 40 | 55 | M8 | 86 | 8 | 17.5 | 10 | 0.06 |
| M11403040 | 40 | 30 | 40 | M8 | 40.5 | 4 | 17.5 | 5 | 0.09 |
| M11403055 | 40 | 30 | 55 | M8 | 114 | 4 | 28.5 | 5 | 0.09 |
| M11404040 | 40 | 40 | 40 | M8 | 78 | 8 | 20 | 10 | 0.1 |
| M11404055 | 40 | 40 | 55 | M8 | 148 | 8 | 34 | 10 | 0.1 |
| M11503540 | 50 | 35 | 40 | M10 | 150 or 139.5 (catalogues differ) | 6 | 26 or 21.5 (catalogues differ) | 6 | 0.14 |
| M11503555 | 50 | 35 | 55 | M10 | 270 or 264 (catalogues differ) | 6 | 49 or 40.5 (catalogues differ) | 6 | 0.14 |
| M11504540 | 50 | 45 | 40 | M10 | 111.5 | 8 | 25 | 10 | 0.16 |
| M11504555 | 50 | 45 | 55 | M10 | 195 | 8 | 54 or 44.5 (catalogues differ) | 10 | 0.16 |
Dimensions are in millimetres: A is the diameter, B is the height and C is the metric thread size, as read from the catalogue diagram. The load and deflection columns use Mackay's own headings (Compression and Shear, each with Maximum Load in kg and Maximum Deflection in mm). Mackay prints all properties as nominal and asks you to contact them for technical advice. Where the Mackay Vibration Isolators catalogue (Industrial Edition 09/2026) and the older Mackay Industrial Rubber Technology catalogue print different loads, both figures are shown, newer catalogue first.
Selecting the right option
Choose the cushion by load first. Each part number has its own maximum load in compression and in shear, so work out the share of the machine weight each cushion carries and stay within the figure for the Duro you choose. Because the figures are nominal, contact Mackay for critical loads, and for any part number where the two catalogues differ. These cushions have no studs, so plan the fixing before you order: Mackay recommends stainless steel hexagonal socket set screws with a locking compound, and the C column gives the thread size. Natural rubber may not suit corrosive environments or solvents, so check with Mackay Technical staff first. Apply the load to the full face of the cushion and avoid permanent tension loading.
Related products
The standard version, in three hardnesses (Duro 40, 55 and 70), is Mackay Multicushion Isolator. For a stainless steel buffer, see Mackay Multibuffer Stainless Steel.
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20 x 25 / 40
Model Number: M11202540
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20 x 25 / 55
Model Number: M11202555
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25 x 20 / 40
Model Number: M11252040
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25 x 30 / 40
Model Number: M11253040
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25 x 20 / 55
Model Number: M11252055
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25 x 30 / 55
Model Number: M11253055
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30 x 20 / 40
Model Number: M11302040
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30 x 30 / 40
Model Number: M11303040
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30 x 40 / 40
Model Number: M11304040
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30 x 20 / 55
Model Number: M11302055
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30 x 30 / 55
Model Number: M11303055
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30 x 40 / 55
Model Number: M11304055
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40 x 30 / 40
Model Number: M11403040
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40 x 40 / 40
Model Number: M11404040
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40 x 30 / 55
Model Number: M11403055
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40 x 40 / 55
Model Number: M11404055
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50 x 35 / 40
Model Number: M11503540
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50 x 45 / 40
Model Number: M11504540
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50 x 35 / 55
Model Number: M11503555
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50 x 45 / 55
Model Number: M11504555
