OV-31M vibration mount: specs, dimensions, load range
The OV-31M vibration mount takes a working load of 250 to 4500 kg per mount, has an M16 stud, a 140 mm pad, an overall height of 132 mm and up to 12 mm of height adjustment. It goes under medium-size machines with rigid beds - lathes, milling and grinding machines, crank presses - so they can be installed without a foundation and levelled. A dedicated OV-31M fixator keeps the mount from shifting in operation.
What the OV-31M vibration mount is and why you need it
The OV-31M is a rubber-metal mount for vibration isolation of machine tools and other plant equipment. A steel housing with a rubber pad sits on the floor, and the machine bed rests on it through a stud and nut. The rubber damps vibration both ways: less vibration goes from the machine into the floor (active isolation) and fewer shocks from neighbouring equipment reach the machine (passive isolation).
The main practical gain is that a machine can be installed without a foundation or anchor bolts, directly on a level concrete shop floor, and then levelled with the nut on the stud. This makes installation and relocation simpler. The mount is made in Ukraine to TU2-024-5997-87 and, according to the manufacturer, needs no maintenance.
One important limit: if the machine manufacturer does not recommend vibration mounts or requires a foundation, the machine passport wins. For the general choice of mount type see how to choose vibration mounts for machine tools.
OV-31M technical specifications: table
Below are the parameters from our product page. The load is per mount, not for the whole machine.
The mean vertical natural frequency of 20 Hz means the following: by classical isolation theory a mount starts to reduce vibration when the excitation frequency is more than 1.41 times its natural frequency, i.e. from roughly 28 Hz. If the main excitation frequency is close to 20 Hz (about 1200 rpm), vibration may be amplified - such cases are worth agreeing with the equipment manufacturer.
You can buy the OV-31M vibration mount individually; the factory pack holds 18 pieces. Other mounts and small parts for equipment installation are in machine tool components. Companies get a VAT invoice; delivery across Ukraine or pickup in Dnipro.
| Parameter | OV-31M |
|---|---|
| Minimum working load per mount | 250 kg (about 2.45 kN) |
| Maximum working load per mount | 4500 kg (about 44.1 kN) |
| Height adjustment | up to 12 mm |
| Mean vertical natural frequency | 20 Hz |
| Stud | M16 |
| Pad diameter | 140 mm |
| Pad height | 60 mm |
| Overall height | 132 mm |
| Mount weight | 1.5 kg |
| Climatic version | UHL4 (indoor premises) |
| Specification | TU2-024-5997-87 |
| Price | from ~1,085 UAH excl. VAT |
Load range 250-4500 kg: does the OV-31M suit your machine
A mount is chosen not by machine weight but by the load on one support point. A simple estimate: machine weight plus tooling and the heaviest workpiece, divided by the number of support points. The number of points is set by the bed - how many holes or feet it has for fixing.
Check both limits. Above 4500 kg per mount the rubber is overloaded. Below 250 kg the pad barely compresses, the natural frequency rises and isolation gets worse - for light equipment there are OV M12 and IV M12 mounts for 40-250 kg. A detailed calculation with examples is in how many vibration mounts a machine needs.
The examples below are illustrative and assume an even weight distribution. On a real machine the heaviest part (for example a lathe headstock) loads its mounts more, so check the most loaded point and keep the margin given in the machine passport.
| Weight with tooling | Support points | Per mount | Verdict |
|---|---|---|---|
| 600 kg | 4 | 150 kg | Below 250 kg - OV M12 or IV M12 fits better |
| 1,800 kg | 4 | 450 kg | Within OV-31M range |
| 3,000 kg | 6 | 500 kg | Within OV-31M range |
| 20,000 kg | 4 | 5,000 kg | Above 4500 kg - more support points or a foundation per passport |
Height adjustment and the OV-31M fixator
The mount allows up to 12 mm of height adjustment: the machine is levelled by turning the nut on the M16 stud. That is enough to take up small floor irregularities. If the difference under the bed is larger, level the floor first, because 12 mm is the whole adjustment travel, not a margin each way.
The mount simply stands on the floor and is not fixed to it. In operation - especially on presses and machines with impact loads - the equipment can gradually creep. That is what the OV-31M vibration mount fixator is for: it secures the installed equipment against shifting. Fixator dimensions per the drawing on its page: A 180 mm, B 140 mm, C 119 mm, D 18 mm; about 345 UAH excl. VAT each.
Installation order, levelling and the check after run-in are covered separately: how to install a machine on vibration mounts.
- Height adjustment: up to 12 mm with the nut on the M16 stud.
- Fixator: needed when there is a risk of shifting - impacts, abrupt starts, shocks from the workpiece.
- How many fixators to fit and how to secure the equipment - per the machine passport; if it says nothing, ask us when ordering.
OV-31M vs OV M12 vs IV M12: comparison
We stock three machine vibration mounts. They differ above all in load range, so one does not replace another: the OV-31M is for medium-weight equipment, the OV M12 and IV M12 for light equipment.
The IV M12 has a hinged stud that lets the mount work under a bed with a slightly inclined support surface. When the hinge is really needed is explained in hinged vibration mounts.
| Parameter | OV-31M | OV M12 | IV M12 |
|---|---|---|---|
| Load per mount | 250-4500 kg | 40-250 kg | 40-250 kg |
| Stud | M16 | M12 | M12, hinged |
| Pad diameter | 140 mm | 80 mm | 55 mm |
| Overall height | 132 mm | 120 mm | 120 mm |
| Height adjustment | up to 12 mm | none | see passport |
| Weight | 1.5 kg | 0.6 kg | 0.6 kg |
| Price excl. VAT | from ~1,085 UAH | from ~684 UAH excl. VAT | from ~620 UAH excl. VAT |
Which machines the OV-31M suits
By design the OV-31M is for medium-size machines of normal and high precision with rigid beds. Most metal-cutting machines and crank presses, as well as pumps, compressors and fans, are installed on such mounts without a foundation, provided the load per mount is within 250-4500 kg:
- medium-class lathes;
- metal milling machines, drilling and grinding machines;
- crank presses - together with fixators;
- pumps, compressors, fans and other plant equipment of suitable weight.
Typical mistakes when choosing the OV-31M
Most problems with vibration mounts come not from the mount itself but from wrong selection or installation. Before ordering, check:
If the machine is heavy, high-precision or its passport explicitly requires a foundation, vibration mounts may not fit - the options are compared in vibration mounts or a foundation. If you are unsure about the number of mounts, send the machine model and weight via the quote form - we will help work out the load per mount and put together a set with fixators.
- Machine weight is spread over all mounts and uneven distribution is ignored - the heaviest point exceeds 4500 kg.
- OV-31M mounts go under light equipment with less than 250 kg per mount - isolation works worse.
- Bed holes are not checked for the M16 stud.
- A large floor difference is expected to be taken up by adjustment - travel is only 12 mm.
- No fixators under a press or a machine with impact loads.
- Old mounts are replaced by name only - compare stud, pad diameter and load range.
FAQ
What load does the OV-31M vibration mount take?
The working load is 250 to 4500 kg per mount. Check both limits for the most loaded point of the bed.
What stud thread does the OV-31M have?
An M16 stud. Pad diameter 140 mm, overall height 132 mm, weight 1.5 kg.
How much height adjustment is there?
The height adjustment limit is 12 mm. A larger floor difference must be corrected before installation.
Why do I need a vibration mount fixator?
The fixator secures the installed equipment and prevents it from shifting in operation. It is fitted first of all under presses and machines with impact loads.
How does the OV-31M differ from the OV M12?
The OV-31M is rated for 250-4500 kg per mount with an M16 stud, the OV M12 for 40-250 kg with an M12 stud. The choice depends on the load per support point.
