These large solid rubber mounts have a mounting flange with fixing slots and a load spreading top disc both of which are chemically bonded to the rubber material. The smallest mount in the range (the SP 8050) also has a chemically bonded intermediate flat steel ring in some variants to achieve a wide performance range.
The supported load should ideally cover at least 80% of the top plate and the male thread is for tightening the load down to the mount and not for jacking up for height adjustment. Any Height adjustment should be provided using shims or washers. All models are now available optionally in 316 Stainless Steel and with alternative thread options including female versions. Standard production is based on Sherardized steel plates and male threads.
Fixed to isolated equipment and to sub-frame or floor. In some applications, this type of mount could be located on an anti-skid plate if it is not appropriate or necessary to bolt to a floor. If care is taken to prevent excessive heat build-up, the mount may be tack-welded to a base plate at its extremities. Safety Note: Extraction or adequate ventilation is essential if welding due to the zinc Sherardized protective finish.
Compressors, engines (petrol & diesel) , air conditioning units, electrical appliances, machine tools.
The alternatives available in the smallest model in this range enable convenient symmetrical mounting to be used in conjunction with different load/deflection characteristics to achieve optimised isolation where loading is not centralised. (see load/deflection graphs)
Rubber: Natural rubber (polyisoprene) of different grades. Alternative elastomers available on request. Typical alternative materials include 60ShA Nitrile, 50ShA Neoprene or 50ShA EPDM
Metal: Sherardized steel and zinc plated & passivated nuts & lock washers.
Note: Most of the range are now available with 316 Stainless Steel Metal parts and are made to order within a typical lead time of only 5 days. If non standard rubber materials are required, a delay may be introduced. The standard stock items have male threads (M12 for 8050 series and M20 for 10080, 15040 and 15080 series’.) The 10080Sp mount has a female M24 x 3 high strength welded insert. Alternative thread sizes and female thread options are also available as are Bump Stop versions (i.e. without the top metal plate).
Note: a number of derivatives of this design are available based on the overall dimensions including:
SP – as pictured with male stud
FP – M12 tapped hole
NBP – male stud (M12), no bottom plate
NTP – flat plate, plain rubber top (Bump Stop application)
The graphs shown are based on the standard natural rubber materials and may differ from results for alternative materials even if the same material hardness is selected.
It is also important to note that the hardness of standard materials can vary by +/-5 ShA.
The characteristics shown here are achieved for the 8050SP size using a combination of 4 natural rubber grades and the central flat steel load ring as shown in the table below. .
Standard Item No
Rubber hardness
Loading disc
Normal Max Load-Kg
8050-SP/12
Shore A 70
Yes
650
8050-SP/10
Shore A 60
450
8050-SP/8
Shore A 50
325
8050-SP/6
No
240
8050-SP/4
Shore A 35
150
8050-SP/2
100
Much softer, hollow versions will shortly be available to suit certain application and will be classed as pedestal mounts with the designation 8050PM/*
These mounts will provide greater deflection than the standard mounting and hence improved isolation from lower frequency vibration. The 8050SP range is stocked with M12 male thread but derivatives can also be provided with M10, M16 or M20 male or female threads. For small quantity requirements, the relevant metal parts may be provided in steel with a protective ‘chassis black’ paint finish rather than the standard Sherardized finish. This does not apply where Stainless steel is specified.
It should be noted that the normal maximum deflection for these types of mounting is 8mm and so the rated loadings for these mounts are 650daN and 1650daN (approx 660Kg and 1680Kg) for the 10080SP and 15080SP types respectively when produced in the standard 70ShA natural rubber material.
If reduced stiffness (‘spring rate’) is required we can produce in alternative rubber materials to achieve load and/or deflection characteristics to suit customer requirements.
Alternative materials can also be offered for this series. Typical alternatives could include 60ShA Nitrile (-4-NIT) pr 50ShA Neoprene (-3-NEO)
Metal parts in Stainless Steel to grade 316 specification are also available for this range as are alternative thread forms.
For these mounts, the normal maximum loading corresponds with a deflection of 4mm and so max loadings of 800, 1500, 1800 and 2200Kg respectively for the -2 to -5 types respectively are suggested.
This is the largest currently in the range but options can usually be considered based around the basic mount construction (different thread sizes or top plate hole patterns)
This mount will be available initially only in Sherardized steel but a stainless steel version will be available later in the year. Load capacity within the range will be from 1000 to 5000Kg according to the material and construction (some versions will have an interleaf plate)
SP.pdf
Anti-Vibration Methods (Rubber) Co Ltd, Unit 5, Woodcock Industrial Estate, Warminster, BA12 9DX, United Kingdom