Vibration Damping Leveling Feet EN 248

Original design
code: LW.A.

Strength Values of Screws Overview of Types Vibration Damping Elements / Vibration Isolation Mounts / Rubber Bumpers Guide to Selecting Vibration Damping Elements Plastic Characteristics

Product description

Leveling feet with damping pad EN 248 made of natural rubber absorb vibrations and shocks, thus increasing the lifetime of machines and reducing noise pollution.

This has a positive influence on the life of a machine and helps to abate noise.

Using the details on the maximum static load F, the maximum permissible compression and the resulting stiffness, the achievable degree of insulation can be determined with the help of the method shown on page XYZ.

The details relating to the load bearing capacity are non-binding recommended values and rule out any liability. They constitute no general warranty of quality and condition. The user must determine from case to case whether a product is suitable for the intended use.

Specification

Vibration damping element
Natural rubber NR

Hardness 80 Shore A
Black

Reinforcing plate / Stud head / Support plate
Steel, zinc plated, blue passivated finish

Adjustable spindle
Steel

Zinc plated, blue passivated finish
Property class 5.8

Hex nut ISO 4032
Steel, zinc plated

RoHS

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Part Number	d₁	d₂	l₁	d₃	d₄	l₂ min.	max.	l₃	l₄	A/F Square	Static load	Stiffness R	Max. compression

248-80-M12X1.25-133	3.15	M 12 x 1.25	5.24	2.36	2.83	1.38	1.81	1.26	0.39	0.28	1124 lbf (5000 N)	14275 lbf/in (2500 N/mm)	0.08
248-120-M16X1.5-144	4.72	M 16 x 1.5	5.67	3.15	4.29	1.57	2.01	1.44	0.39	0.35	2248 lbf (10000 N)	22841 lbf/in (4000 N/mm)	0.10
248-160-M20X1.5-188	6.30	M 20 x 1.5	7.40	3.94	5.91	1.97	2.48	1.71	0.39	0.47	4496 lbf (20000 N)	51391 lbf/in (9000 N/mm)	0.09
248-200-M20X1.5-198	7.87	M 20 x 1.5	7.80	5.12	7.32	2.36	2.87	2.15	0.39	0.47	8992 lbf (40000 N)	85652 lbf/in (15000 N/mm)	0.11

d₁	d₂	l₁	d₃	d₄	l₂ min.	max.	l₃	l₄	A/F Square	Static load	Stiffness R	Max. compression

3.15	M 12 x 1.25	5.24	2.36	2.83	1.38	1.81	1.26	0.39	0.28	1124 lbf (5000 N)	14275 lbf/in (2500 N/mm)	0.08
4.72	M 16 x 1.5	5.67	3.15	4.29	1.57	2.01	1.44	0.39	0.35	2248 lbf (10000 N)	22841 lbf/in (4000 N/mm)	0.10
6.30	M 20 x 1.5	7.40	3.94	5.91	1.97	2.48	1.71	0.39	0.47	4496 lbf (20000 N)	51391 lbf/in (9000 N/mm)	0.09
7.87	M 20 x 1.5	7.80	5.12	7.32	2.36	2.87	2.15	0.39	0.47	8992 lbf (40000 N)	85652 lbf/in (15000 N/mm)	0.11

Min	Max	Price
1	6	US$66.70
7	99	US$64.28
100	249	US$60.64
≥ 250		US$54.58

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EN 248 Vibration Damping Leveling Feet Steel, Fixed Threaded Stud Type, with Rubber Pad

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For correct selection of a standard part used for vibration damping, it is first necessary to understand the terms listed below: The disturbing frequency is the frequency emitted by the machine, e.g. the number of strokes per minute, measured in Hertz, or the main shaft rotation speed, measured in revolutions per minute. The static load in Newtons is the load that acts on a single vibration damping element. The total weight of a machine is divided by the number of damping elements. In an optimal arrangement, each element bears the same load. The degree of isolation, given in percent, is the measure of the absorption of the disturbing frequency, i.e. the damping. The compression or the spring travel is the maximum change in the height of the damping element in mm. The calculated spring rate in Newtons/millimeter is the load that causes a height change of 1 mm.

Example with the following assumptions: Disturbing frequency = 50 Hz; load = 120 N; desired degree of isolation = 90 % The selection of a suitable vibration damping element begins with determining the required compression. This can be taken from the y-axis of the diagram at the intersection of a vertical line at 50 Hz (x-axis) and the characteristic curve of the desired degree of isolation of 90 %. The example values yield a compression of 1 mm. With the compression determined in this way and the given static load, it is possible to calculate the required spring rate with the following formula: Static load F [N] per damping element / Spring travel s [mm] = Spring rate [N/mm] => 120 N / 1mm = 120 N/mm Based on the calculated spring rate and the desired shape, the appropriate damping element can then be selected. The respective spring rates are given in a table on the corresponding standard sheets. In making the selection, it is important to ensure that the spring rate at least satisfies the calculated value. The example arrives at a vibration damping element with article number GN 148.3-46-M10-A-60-S and a spring rate of 138.3 N/mm.