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VFDB20N

VFDB20N
VFDB20N
VFDB20N
VFDB20N
VFDB20N

VFDB20N | 20mm double-bellows Vacuforce suction cup — nitrile rubber (NBR)

Vacuforce VFDB20N is a 20mm double bellows suction cup made from nitrile rubber (NBR). Its double-bellows profile is intended for industrial vacuum pick-and-place; selection depends on the part surface, cup geometry, available vacuum and mounting connection.

This page includes calculated theoretical lifting force at 24"Hg / 80% vacuum using both metric and imperial engineering methods.

20mmCup Diameter
2.5kgLift at 24"Hg
5.7lbLift at 80% Vacuum
NBRNot specified nitrile rubber

Technical Specifications

SpecificationDetails
Cup Diameter20mm / 0.787"
Cup StyleDouble Bellows
MaterialNBR (nitrile rubber)
Recommended Working Vacuum for Calculation24"Hg / 80% vacuum
Metric Cup Area3.1 cm²
Imperial Cup Area0.49 in²
Effective Vacuum Pressure11.76 PSI
Estimated Lifting Force at 24"Hg2.5 kg / 5.7 lb
Temperature Range-40°C to +120°C / -40°F to +248°F
Connection TypePush-on / pull-off suction cup fitting connection where applicable
HTS Code3926.90.9890
Material designation-N
Cup colourNot specified
Vacuforce modelVFDB20N

Estimated Lifting Force at 24"Hg

Lifting force is calculated from the suction cup diameter and adjusted to 80% vacuum. At sea level, atmospheric pressure is approximately 14.7 PSI. At 80% vacuum, the effective pressure is 14.7 x 0.8 = 11.76 PSI.

3.1 cm²Metric Cup Area
0.49 in²Imperial Cup Area
2.5 kgMetric Lift at 80% Vacuum
5.7 lbImperial Lift at 80% Vacuum

Lifting Force Calculation

Calculation StepMetricImperial
Diameter20mm / 2.00cm0.787"
Areaπ x 1.00² = 3.1 cm²π x 0.394² = 0.49 in²
Vacuum Level80% vacuum24"Hg / 80% vacuum
Effective PressureArea x 0.814.7 PSI x 0.8 = 11.76 PSI
Estimated Lifting Force3.1 x 0.8 = 2.5 kg0.49 × 11.76 = 5.7 lb

Important: Calculated lifting force is theoretical and should not be used as the final working load without applying the correct safety factor. Actual performance depends on surface condition, porosity, acceleration, cup orientation, leakage, vacuum level and application conditions.

Typical Applications

  • General industrial pick-and-place
  • Handling suitable cartons, glass, plastics and formed parts
  • Vacuum tooling and assembly automation
  • Height variation and gentle engagement in automated transfer

Why Choose This Cup Style?

Double Bellows suction cups are selected according to product shape, surface condition, required height compensation and cycle speed. Bellows styles provide more compliance and height compensation, while flat cups are generally preferred where low internal volume and fast release are important.

Material and colour — VFDB20N

General-purpose NBR for industrial handling. Select according to surface, temperature, oil exposure and application conditions.

Cup selection and fit considerations

Compare cup diameter, bellows profile, lip geometry, mounting bore, material and vacuum performance when selecting a functional alternative. A similar appearance or nominal model size does not by itself guarantee interchangeability.

Frequently Asked Questions

What does VFDB20N mean, including its material suffix?

VFDB20N identifies a Vacuforce 20mm double bellows cup. The material designation -N refers to nitrile rubber (NBR). General-purpose NBR for industrial handling. Select according to surface, temperature, oil exposure and application conditions.

What colour is the VFDB20N suction cup?

The current product data identifies NBR material but does not specify a reliable standard colour; confirm colour against the ordered product.

What applications suit this double-bellows suction cup?

Typical uses include General industrial pick-and-place, Handling suitable cartons, glass, plastics and formed parts. Confirm surface sealing, process conditions, cycle rate and handling orientation by testing.

What is the cup size and how should I select a fitting?

The listed cup diameter is 20mm (0.787in). Match the fitting to the Vacuforce cup series and mounting bore; a shared nominal size is not proof of mounting compatibility.

How much theoretical lifting force does VFDB20N provide?

At the page calculation condition of approximately 24inHg (80% vacuum), the existing estimate is 2.5kg / 5.7lb before any safety factor. This assumes ideal sealing and must not be treated as a certified working load.

Does a similarly shaped cup automatically fit another brand of tooling?

No. Compare actual lip diameter, bellows geometry, mounting interface, material and working conditions before selecting a fit-form-function alternative. Confirm performance by application testing.

Is this NBR cup metal-detectable or food-contact silicone?

No. -N identifies general-purpose nitrile rubber. Metal-detectable grades use -SMI/-STMI and standard FDA-compliant silicone grades use -S/-ST; select material based on the application.

Is a safety factor required for vertical lifting?

Yes. Use an appropriate engineering safety factor; Vacuforce normally recommends at least 8:1 for vertical lifting. Account for leakage, part acceleration, load orientation and surface condition, and validate safe working load in the application.

Link to Pneuforce Data sheets 
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Tags: BX20P.4K, 0118507, 21.021.176.16, GsV BDD 20

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