Vibration Damping Leveling Feet GN 148

Type: A - With two-hole flange (d₁ = 60 / 90 / 113 mm)

Standard Sheet GN 148 Print This Page Technical Information Determining the Suitable Leveling Foot Plastic Characteristics

Product description

Leveling feet GN 148 are designed for limiting vibration on heavy machinery, thus increasing the lifetime of the machines and reducing noise pollution.

The structure of these feet helps absorb horizontal forces. The version with tear-off lock (identification no. 2) protects the feet from destruction caused by tear-off under excessive tension loads.

The information about load bearing capacity are non-binding guide 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

Base / flange
Steel sheet metal, zinc plated, blue passivated finish

Tapped insert
Steel, zinc plated, blue passivated finish

Vibration damping pad
Natural rubber (NR)

Vulcanized
Temperature resistant up to 176 °F (80 °C)
Hardness Shore A ±5
Soft43
Medium57
Hard68

RoHS

Accessory

Rubber Pads GN 148.2

GN 148 Steel Sheet Metal Vibration Damping Leveling Feet, Tapped Type, with Rubber Pad sketch

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Part Options / Table

Type

A	With two-hole flange (d₁ = 60 / 90 / 113 mm)
B	With four-hole flange (d₁ = 113 / 126 mm)

Identification no.

1	Without tear-off lock
2	With tear-off lock

Part Number 1 - Without tear-off lock	Part Number 2 - With tear-off lock	d₁	d₂ Thread	d₃	d₄ Type A	d₅ Type B	h	s	b Type A	l₁ Type A	l₂ Type B	m₁ Type A	m₂ Type B

148-60-M10-A-1-43	148-60-M10-A-2-43	2.36	M 10	3.07	0.35	-	1.18	0.08	3.07	5.04	-	4.33	-
148-60-M10-A-1-57	148-60-M10-A-2-57	2.36	M 10	3.07	0.35	-	1.18	0.08	3.07	5.04	-	4.33	-
148-60-M10-A-1-68	148-60-M10-A-2-68	2.36	M 10	3.07	0.35	-	1.18	0.08	3.07	5.04	-	4.33	-
148-90-M12-A-1-43	148-90-M12-A-2-43	3.54	M 12	4.17	0.51	-	1.54	0.12	4.33	6.69	-	5.51	-
148-90-M12-A-1-57	148-90-M12-A-2-57	3.54	M 12	4.17	0.51	-	1.54	0.12	4.33	6.69	-	5.51	-
148-90-M12-A-1-68	148-90-M12-A-2-68	3.54	M 12	4.17	0.51	-	1.54	0.12	4.33	6.69	-	5.51	-
148-113-M16-A-1-43	148-113-M16-A-2-43	4.45	M 16	5.91	0.49	-	2.05	0.16	5.91	8.50	-	7.24	-
148-113-M16-A-1-57	148-113-M16-A-2-57	4.45	M 16	5.91	0.49	-	2.05	0.16	5.91	8.50	-	7.24	-
148-113-M16-A-1-68	148-113-M16-A-2-68	4.45	M 16	5.91	0.49	-	2.05	0.16	5.91	8.50	-	7.24	-

Part Number 1 - Without tear-off lock	Part Number 2 - With tear-off lock	d₁	d₂ Thread	d₃	d₄ Type A	d₅ Type B	h	s	b Type A	l₁ Type A	l₂ Type B	m₁ Type A	m₂ Type B

148-113-M16-B-1-43	148-113-M16-B-2-43	4.45	M 16	5.91	-	0.49	2.05	0.16	-	-	6.61	-	5.20
148-113-M16-B-1-57	148-113-M16-B-2-57	4.45	M 16	5.91	-	0.49	2.05	0.16	-	-	6.61	-	5.20
148-113-M16-B-1-68	148-113-M16-B-2-68	4.45	M 16	5.91	-	0.49	2.05	0.16	-	-	6.61	-	5.20
148-126-M20-B-1-43	148-126-M20-B-2-43	4.96	M 20	6.97	-	0.51	2.48	0.16	-	-	7.24	-	5.91
148-126-M20-B-1-57	148-126-M20-B-2-57	4.96	M 20	6.97	-	0.51	2.48	0.16	-	-	7.24	-	5.91
148-126-M20-B-1-68	148-126-M20-B-2-68	4.96	M 20	6.97	-	0.51	2.48	0.16	-	-	7.24	-	5.91

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Metric

Dimensions in: Inch (change to Metric)

d₁	d₂ Thread	d₃	d₄ Type A	d₅ Type B	h	s	b Type A	l₁ Type A	l₂ Type B	m₁ Type A	m₂ Type B

2.36	M 10	3.07	0.35	-	1.18	0.08	3.07	5.04	-	4.33	-
3.54	M 12	4.17	0.51	-	1.54	0.12	4.33	6.69	-	5.51	-
4.45	M 16	5.91	0.49	0.49	2.05	0.16	5.91	8.50	6.61	7.24	5.20
4.96	M 20	6.97	-	0.51	2.48	0.16	-	-	7.24	-	5.91

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Definitions

F₁ = Static load in vertical direction (pressure)
F₂ = Static load in horizontal direction (lateral thrust)
s₁ = Compression in vertical direction (spring excursion) under load through F₁
s₂ = Compression in vertical direction (spring excursion) under load through F₂

Stiffness R:
Is the load that causes the damping pad to be compressed by 1 in / 1 mm (spring rate)

Equation for calculating the stiffness: R = F/s

The table below gives details on the maximum static load F, the maximum permissible compression and the resulting stiffness R.
The method shown below and the values given below allow the maximum degree of insulation of the vibration to be determined as factor of the interference frequency.

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d₁	Hardness in Shore	Max. static load F₁	Stiffness R₁	Max. compression s₁ in mm	Max. static load F₂	Stiffness R₂	Max. compression s₂ in mm

60	43	247 lbf (1100 N)	340 N/mm (1941 lbf/in)	3.2	517 lbf (2300 N)	770 N/mm (4397 lbf/in)	3
60	57	393 lbf (1750 N)	550 N/mm (3141 lbf/in)	3.2	764 lbf (3400 N)	1130 N/mm (6452 lbf/in)	3
60	68	629 lbf (2800 N)	930 N/mm (5310 lbf/in)	3	899 lbf (4000 N)	1130 N/mm (6452 lbf/in)	3
90	43	337 lbf (1500 N)	430 N/mm (2455 lbf/in)	3.5	674 lbf (3000 N)	750 N/mm (4283 lbf/in)	4
90	57	629 lbf (2800 N)	800 N/mm (4568 lbf/in)	3.5	1124 lbf (5000 N)	1330 N/mm (7594 lbf/in)	3.8
90	68	1012 lbf (4500 N)	1290 N/mm (7366 lbf/in)	3.5	1574 lbf (7000 N)	1870 N/mm (10678 lbf/in)	3.8
113	43	787 lbf (3500 N)	1000 N/mm (5710 lbf/in)	3.5	1012 lbf (4500 N)	1290 N/mm (7366 lbf/in)	3.5
113	57	1461 lbf (6500 N)	1860 N/mm (10621 lbf/in)	3.5	1686 lbf (7500 N)	2140 N/mm (12220 lbf/in)	3.5
113	68	2248 lbf (10000 N)	2860 N/mm (16331 lbf/in)	3.5	2473 lbf (11000 N)	3140 N/mm (17930 lbf/in)	3.5
126	43	1686 lbf (7500 N)	2140 N/mm (12220 lbf/in)	3.5	2023 lbf (9000 N)	2570 N/mm (14675 lbf/in)	3.5
126	57	2810 lbf (12500 N)	3570 N/mm (20385 lbf/in)	3.5	3372 lbf (15000 N)	4290 N/mm (24497 lbf/in)	3.5
126	68	4271 lbf (19000 N)	5340 N/mm (30492 lbf/in)	3.5	5058 lbf (22500 N)	6430 N/mm (36716 lbf/in)	3.5

Application Example

Degree of Insulation

Interference frequency [Hz]:
Is the frequency emanating from a machine,
e.g. from the machine main shaft speed [rpm].

Static load F [lbf or N]:
Is the load acting on each vibration damping pad (leveling foot).

Degree of insulation [%]:
Is the measure for absorbing the interference frequency (damping)

Compression s [in or mm]:
Is the change in the height of the damping pad (spring rate).

Stiffness R [lbf/in or N/mm]:
Is the load that causes the damping pad to be compressed by 1 in / 1 mm (spring rate)

Determining the Suitable Leveling Foot and the Maximum Degree of Insulation

The first step is to determine the static load F per leveling foot. With appropriately arranged leveling feet and thus an evenly distributed load F, this value is calculated using the following equation:

Force due to weight of the machine [lbf or N] / Number of leveling feet

= Static load F [lbf or N] per leveling foot

Use the calculated static load F to select a leveling foot from the table, making sure that the static load F lies as close as possible to the static load capacity without exceeding it. The associated stiffness R of the selected leveling foot is also taken from the table.
The actual compression is then calculated using the equation below:

Static load F [lbf or N] per leveling foot /
Stiffness R [lbf/in or N/mm]

= Actual compression s [in or mm]

Starting from the calculated actual compression s, the achievable degree of insulation as factor of the interference frequency can now be taken from the chart shown above. To optimize the achievable degree of insulation, the number of leveling feet may be changed such that the static load F for each leveling foot is as close as possible below a load capacity value given in the table. This will increase the compression s which, in turn, results in a higher degree of insulation.
In general, medium to high frequencies can be very well insulated with sufficient compression.

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Total (net)

US$61.44

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Please note our quantity discounts (US Dollars).

Min	Max	Price
1	49	US$61.44
50	99	US$56.32
100	249	US$51.20
≥ 250		US$46.08

Prop 65: Not compliant

WARNING:
Cancer and Reproductive Harm - www.P65Warnings.ca.gov

RoHS: Compliant

This article is RoHS-compliant in application of Annex III., which means it complies with EU Directive 2011/65/EU, including extension (2015/863/EU), for restricting the use of certain hazardous substances in electrical and electronic devices. The Directive regulates the use of hazardous substances in devices and components. The implementation in national law is summarily described with RoHS(Restriction of (the use of certain) hazardous substances)).

Weight: 0.524 lbs

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