E-Vac Vacuum Generators

Vacuum Cups

Vacuum Cups

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Choosing a Suitable Vacuum Cup

ELarge Round Vacuum Generator CupsXAIR vacuum cups are vinyl. They are ideal for general purpose applications and provide excellent resistance to wear. The Durometer rating (used to indicate the flexibility and stiffness of the cup) is A50. Temperature range is 32°F to 125°F.

Round Cups are best suited to smooth, flat surfaces. They will grip and release quickly. These cups hold their shape with extended use and grip well to vertical surfaces. Round cups with cleats are better at lifting heavy loads. Cups without cleats can be used for light lifting.
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Small Round
Model
Description
Thread
900752
1" X 1.12" (25mm x 28mm)
1/4 NPTF
900753
1" X 1.62" (38mm x 41mm)
1/4 NPTF
900754
2" X 1" (51mm x 25mm)
1/4 NPTF
900755
2.5" X 1.8" (64mm x 46mm)
1/4 NPTF
900756
3.5" X 1.1" (89mm x 28mm)
1/4 NPTF
Large Round
900757
3.25" X 1.15" (83mm x 29mm)
3/8 NPTF
900758
3.25" X 1.15" (83mm x 29mm)
1/4 NPTF
900759
4.25" X 1.18" (108mm x 30mm)
3/8 NPTF
900760
5" X 1.75" (127mm x 44mm)
3/8 NPTF
900761
6" X 1.31" (152mm x 33mm)
1/2 NPTF
Oval Cups provide the most vacuum due to the larger surface area. They provide more vacuum power than round cups and are suited to lifting heavy loads. They are designed to handle flat rigid sheet materials like wood, glass, cardboard boxes and composites.
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Oval
Model
Description
Thread
900762
0.5" X 1.0" (13mm x 25mm)
1/8 NPTM
900763
0.5" X 2.0" (13mm x 51mm)
1/8 NPTM
900764
0.87" X 1.73" (22mm x 44mm)
1/8 NPTM
900765
1.47" X 2.96" (37mm x 75mm)
1/8 NPTF
Bellows Cups are best suited to textured, uneven surfaces. The folds, called “convolutions”, provide a collapsible area that allows the cup to quickly compress when it touches the flat surface. The attach and release time is greater due to the significant volume of the cup.
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Bellows
Model
Description
Thread
900766
0.73" X 1.43" (19mm x 36mm)
1/4 NPTF
900767
1" X 1.48" (25mm x 38mm)
1/8 NPTF
900768
1.5" X 1.12" (38mm x 28mm)
1/4 NPTF
900769
2" X 1.54" (51mm x 39mm)
1/4 NPTF
900770
2.5" X 2.4" (64mm x 61mm)
1/4 NPTF
900771
3.25" X 3" (83mm x 76mm)
3/8 NPTF

Vacuum Cup Selection

To select a vacuum cup for your application, you need to know:

  • The weight of the item being lifted
  • If the item to be lifted is porous or non-porous.
  • The safety factor

A safety factor or 2 is recommended when the vacuum cup is positioned horizantally.

A safety factor of 4 is recommended when the vacuum cup is positioned vertically.

Some companies or local codes may required a specific safety factor.

Weight in lbs that a vacuum cup can hold at a given pressure
Vacuum in "Hg Lip Diameter (in) of Vacuum Cup
  1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6
5 1 2.2 3.9 6 8.7 11.8 15.4 19.5 24.1 29.2 34.7
10 1.9 4.3 7.7 21.1 17.4 23.6 30.9 39.1 48.2 58.4 69.4
15 2.9 6.5 11.6 18.1 26 35.4 46.3 58.6 72.3 87.5 104.2
20 3.9 8.7 15.4 24.1 34.7 47.3 61.7 78.1 96.4 116.7 138.9
21 4.1 9.1 16.2 25.3 36.5 49.6 64.8 82 101.3 122.5 145.8
27 5.2 11.7 20.8 32.6 46.9 63.8 83.3 105.5 130.2 157.5 187.5
Weight in newtons that a vacuum cup can hold at a given pressure
Vacuum in kPa Lip Diameter (mm) of Vacuum Cup
  25 38 51 64 76 89 102 114 127 140 152
17 4.3 9.7 17.2 26.8 38.6 52.6 68.6 86.9 107.2 129.8 154.4
34 8.6 19.3 34.3 53.6 77.2 105.1 137.3 173.7 214.5 259.5 308.9
51 12.9 29 51.5 80.4 115.8 157.7 205.9 260.6 321.7 389.3 463.3
68 17.2 383.6 68.6 107.2 154.4 210.2 274.6 347.5 429 519.1 617.8
71 18 40.5 72.1 112.6 162.2 220.7 288.3 364.9 450.4 545 648.6
91 23.2 52.1 92.7 144.8 208.5 283.8 370.7 469.1 579.1 700.8 834

 

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