Application · Fixture & workholding clamping
A clamping power pack has one job to do supremely well: apply a set clamp force and hold it dead steady for the whole cut. It is a holding duty, not a working one — modest flow to set the clamp, then a long, drift-free hold at moderate pressure. That makes a clamping unit compact, quiet and hold-optimised, a world apart from a press power pack. Suyog sizes each clamping HPU around your fixture data and tests it before it ships. This is a hydraulic clamping power pack for Pune workshops and beyond — for VMC and CNC fixtures, jigs, and general workholding.
Clamping looks simple — close, hold, release — but the demands it puts on a power pack are specific. Get these right and the fixture holds part after part without a second thought; get them wrong and you chase drift, marks and scrap.
The table below shows the range clamping power packs usually fall in. Treat every figure as typical and illustrative — a starting point for discussion, not a quotation. Your real numbers come from the clamp force, the number of clamps and how they move; use our calculators or the configurator to pin them down.
| Parameter | Typical clamping range | Notes |
|---|---|---|
| Working pressure | 40–200 bar (typical) | Machine-tool clamping often ~100–160 bar; set from clamp force and bore. |
| Flow | Low (typical) | Only needed to close the clamp; near zero during the hold. |
| Duty cycle | Intermittent | Brief clamp/unclamp per part; long holds with the pump idle or off. |
| Reservoir | Small, ~3× flow (typical) | Light duty and low flow keep the tank compact and cool. |
| Load holding | Pilot-operated check / load-holding valve | Locks clamp pressure; no drift, safe on power or hose loss. |
| Control | DCV per clamp; pressure switch; gauge | Accumulator optional to hold pressure with the motor off. |
Ranges are illustrative of typical fixture and workholding duty. Suyog builds and tests each unit to the specification agreed from your application data.
For clamping and workholding duty, these units are the usual starting points. Tell us the clamp force, the number of stations and how they sequence, and we will confirm the right one.
Compact clamping unit for VMC and machine-tool fixtures, built around steady hold.
View product →Proven off-the-shelf HPUs for general clamping and actuation duties.
View product →Clamping, tailstock and chuck power sized for the shop floor.
View product →Working out clamp pressure, flow and tank size yourself? These guides carry the full method, and the calculators do the arithmetic.
The full application-to-unit method, step by step, with a worked example.
Read guide →Why pressure sets clamp force and flow sets clamp speed — independently.
Read guide →Turning working pressure and flow into the right motor kW.
Read guide →Why reservoir volume drives cooling, air release and oil life.
Read guide →Free pressure, flow, motor-power and tank calculators.
Open calculators →Most fixture and workholding clamping runs between about 40 and 200 bar, and a large share of machine-tool clamping sits around 100–160 bar. The exact figure comes from the clamp force each element must hold and the cylinder or clamp bore it acts on — pressure equals force divided by piston area. These ranges are typical and illustrative; the working pressure is set from your fixture data, not assumed.
Clamp force has to stay put for the whole cut, so the circuit holds it rather than the pump. A pilot-operated check valve or load-holding valve locks the clamp line, an accumulator can maintain pressure so the motor need not run continuously, and a pressure switch restarts the pump only if pressure decays. That combination gives steady holding with no measurable drift while keeping oil temperature and energy use down.
Clamping is a holding duty: modest flow to close the clamp quickly, then a long steady hold at moderate pressure with almost no flow. A press is a working duty: much higher pressure and far higher flow to drive a ram through a forming stroke, needing a larger tank and cooling. A clamping unit is therefore compact and hold-optimised, where a press unit is built around flow, pressure and heat. See our press power pack page for that side.
Yes. A single unit can serve multiple clamps or fixtures through a manifold, with one directional valve per clamp station and, where needed, sequence valves so clamps set in the right order. Size the flow for the clamps that move together, not the total count, and give each critical station its own load-holding valve so one clamp releasing cannot drop the others.
Related applications
Higher pressure and flow for forming? See Hydraulic Power Packs for Presses. Or browse every duty on the Applications hub.
Clamping duty, sized right
Use the configurator for a full recommended build, or send your fixture requirement and our engineers will confirm the unit and test it before it ships.
