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| Maximum holding power | 150 kg |
| Air consumption | 23 l/min at 0.6–0.8 MPa |
| Dimensions (H × W × L) | 22 × 165 × 205 mm |
| Weight | 325 g |
| Mounting | screws or bolts, to a table or stand |
| Orientation | horizontal or vertical |
Changing the seal changes how much of the cup's surface is under suction. The whole-surface seal is for large, rectangular pieces; the section seals restrict the suction area so the clamp also holds a piece that does not cover the whole cup. That is why the set contains four seals in three sizes.
The manufacturer states that clamping force depends on two things: the porosity of the clamped material and the cleanliness of the clamped surface. The stated 150 kg is therefore an upper limit reached on a sealed, clean face — porous material passes air and the vacuum will not hold.
For switching and regulating the suction there is the lever valve M966-01, for connecting additional cups the T-splitter M966-02, and the seal is a consumable with its own replacement set M964-01.
A vacuum clamp does not really ”suck” the workpiece down. Air is removed from under the cup, and the clamping is done by the surrounding atmospheric pressure pressing the workpiece against the cup. Holding power therefore depends on two things: how large the sealed area is, and how well the workpiece blocks air from returning under the cup.
This is the single most important factor in vacuum clamping. If the workpiece passes air, or lets it in under the seal, the vacuum breaks down and the stated holding power is not reached — the fault may not be visible anywhere, the grip is simply weak.
Cleanliness is part of the seal too: a speck of dust under the seal is a leak path. Wipe both the cup and the clamping surface before work, and test the grip before trusting it.
Vacuum can be generated in two ways, and the physics of the clamping is the same in both. A Venturi generator — as in this clamp — makes vacuum from compressed air: the air is accelerated through a restriction, the pressure drops and draws the air out from under the cup. It needs a compressor but has no moving parts and no maintenance. A vacuum pump makes vacuum electrically, uses less energy in continuous duty and works without an air line — but it is a more expensive device that needs servicing. In a shop that already has compressed air, the Venturi is in practice always the simpler answer.
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The calculations are based on the Grenke leasing price list, which does not include insurance. Insurance is compulsory and the customer can either purchase their own insurance or take it out with the same contract. Leasing financing is only granted to companies with a valid business ID.
Lease period 12-72 months.
Leasing prices VAT 0.
Option to redeem at the end for your own final delivery price, which will be shown under the product and in the summary. The minimum final delivery price is 70€ VAT 0.
After placing an order with leasing financing, you will receive within 1-2 days by email the contracts for electronic signature.
If you wish to use your own insurance, the leasing company will require a certificate of insurance showing the following:
A vacuum clamp for holding non-porous workpieces during drilling, routing, sanding and other activities. The clamp is connected to compressed air from the compressor, and a Venturi tube system turns it into a powerful vacuum. Holding power is up to 150 kg.
The clamp is fastened to a table or a stand from one side with screws or bolts, and it can be used horizontally or vertically. The rubber sealing is removable, so the suction surface can be adapted to small or irregular shapes.
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