20 mm Short Stroke Linear Actuator

The 20 mm short stroke linear actuator is used where a position has to hold after the drive has stopped: a pin that stays in its hole through a power cut, a cover that stays pressed on a gasket between shifts. The mechanism supplies the guidance - hinge, bore, rail - and the unit supplies the final 20 mm of push and the hold that follows.

In the machine it presents three things: a Ø16 mm tube for the clamp, a threaded rod end for the pin, and a limit protection board mounted outside the tube. The hinge, bore and door stay as they are.

At 2 mm/s on load, 20 mm takes about 10 s; unloaded it is nearer 7 s. At that speed the pin reaches the bore without impact and stops without overshooting. If a cycle has to close inside two seconds, this is the wrong platform and more force will not change it.

A swap cabinet repeats one sequence at every bay: the door closes, the pin passes through door and frame, the pack is locked, and then the cabinet may sit unpowered for hours or ride to another site on a truck. Pin travel equals bore depth plus chamfer plus overlap, and for most bay designs that lands on 20 mm.

• Entering the hole. 200 N has to beat the return spring plus latch friction with something left over for a pack that sits slightly off centre. The 20 mm divides into 3 mm of release clearance, 2–3 mm of nose chamfer and 14–15 mm of engagement, so the pin squares the door up on the chamfer instead of stalling against the bore. The pin threads onto the rod end, so a worn pin is a pin change, not an actuator change.
• Holding through a cut. The gear train carries the load: 300 N static with the cabinet dead, and no coil burning current to keep it there. A bay that loses power mid-swap, or a cabinet on a pallet, keeps its pins where they were left.
• Retracting and jamming. If a warped door or a stray cable stops the pin, current climbs and the external limit protection board cuts at a 0.32 A current limit, before the winding cooks. The same board gives auto stop at both ends, so nothing in the door has to act as the stroke end.
• Fitting it in. The clamp goes straight onto a bay column, so the sheet metal keeps its original shape - no slot, no welded pad. All five stroke lengths share the same body, so a change of travel moves the clamp, not the design. Dust inside the bay and wash water on the floor sit inside the IP65 rating and the 304 housing.
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Most bays in this size class use a solenoid pin: the coil pulls in, a spring pushes back when the supply drops. The difference between the two comes down to what happens after power is removed and how the pin arrives.

A solenoid wins on speed and unit price. If the door must pop open on power loss, or the cycle has to finish inside one second, this variant is the wrong choice. It pays off only where the pin has to stay engaged with the supply off and a few seconds of travel is acceptable.

All five standard stroke lengths share the Ø16 mm body, the 24 V supply voltage and the 20 kg dynamic load. Only

stroke length and installed dimension change.

20 mm is the specification on this page, with retracted length and extended length quoted per stroke; mounting distance follows the stroke. Other stroke lengths and shared data sit on the 24V tubular linear actuator page.

The 20 mm is spent in three parts:

• Release clearance, 3 mm. What the pin needs to clear the bore completely. Cut it short and the pin scrapes on the way out.
• Lead-in chamfer, 2–3 mm. The chamfer on the pin nose squares the door up. This is where misalignment is absorbed.
• Engagement, 14–15 mm. The loaded length, and the only part that carries shear.

The three add up to 20 mm. If the bore is deeper than 15 mm, move to the 30 mm stroke length instead of lengthening the pin nose - a longer nose increases the side-load arm without adding engagement.

With 2 mm of door rebound under spring load, engagement drops to about 12 mm, which still holds. Past 5 mm of rebound the door guidance itself needs work; extra stroke will not fix it.

The plant works to ISO9001 and the product carries CE; documents are on the certification page. Load testing happens on each unit before packing, on the rigs listed under test equipment. Warranty runs 6 months and is limited to defects in manufacturing and materials.

For a quotation, send: stroke length, quantity, and cycles per day.

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