The AirTAC Airtac SCD Standard Cylinder SCD50X20 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø20mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø50mm bore, 20mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD50X20 is a double-acting, double-rod pneumatic cylinder that outputs an identical 825 N of thrust in both directions at 0.5 MPa, thanks to its through-rod design where the 20 mm rod subtracts the same area from each piston face. With a short 20 mm stroke and a body length A(SCD) of 207 mm, it is built for compact, repetitive two-sided tasks where space is tight but balanced force matters.
Both ends of the Ø20 rod are threaded M16x1.5, allowing you to mount tooling, stops, or sensor flags on the rear rod while the front rod does the primary work. The adjustable air cushion on each end (21 mm long) decelerates the piston smoothly, and the PT1/4 ports keep plumbing straightforward. This is a genuine AirTAC tie-rod cylinder, not an ISO 15552 profile unit.
| Model | Airtac SCD Standard Cylinder SCD50X20 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 20 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| Fluid | Air (filtered by 40µm element) |
|---|---|
| Operating pressure | 0.15 – 1.0 MPa |
| Proof pressure | 1.5 MPa |
| Temperature | -20 to +70 °C |
| Speed range | 30 – 800 mm/s |
| Cushion | Adjustable, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCD (double-rod) datasheet. Because the rod runs through both caps, the effective area is (bore² − rod²) in both directions. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 825 N | 825 N |
| 0.7 MPa | 1155 N | 1155 N |
| Max (@1.0 MPa) | 168 kgf | |
Push and pull are EQUAL on a double-rod cylinder — both chambers lose the rod area, so effective area = (bore² − rod²) each way. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | Bore size in mm. |
| ×20 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod), SCJ (adjustable stroke), SCT (multi-position). SCD mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
The equal 825 N force in both directions makes this short-stroke cylinder ideal for a two-sided clamp that grips a part from opposite sides simultaneously, ensuring balanced pressure without distorting the workpiece.
Use the rear rod extension as a positive stop or a visual stroke-confirmation flag while the front rod ejects small components. The 20 mm stroke provides a crisp, repeatable push with no force differential.
Mount a sensor target on the rear M16x1.5 rod to trigger a confirmation signal on the retract stroke, while the front rod performs the main work. Both strokes deliver identical speed and force for consistent timing.
Choose the SCD50X20 when you need equal push-pull force from both rod ends in a confined stroke length. If 825 N at 0.5 MPa is too light, step up to the SCD63 bore which provides 1402 N; if it is more force than required, the SCD40 offers 528 N. For applications that only need force from one end, a single-rod SC50 cylinder would be a simpler, lower-cost alternative. This cylinder is not a guided unit—if the short 20 mm stroke still encounters side load, add an external guide rail.
As a direct replacement, match the 50 mm bore, 20 mm stroke, PT1/4 port thread, basic mounting style, and the absence of a magnet. The SCD double-rod cylinder must be replaced with another AirTAC SCD of the same configuration to guarantee identical dimensional and force characteristics.
Double-rod checklist
The push and pull forces are identical because the piston rod extends through both ends of the cylinder. At 0.5 MPa, the force is 825 N; at 0.7 MPa it is 1154 N; and at the maximum operating pressure of 0.9 MPa, it reaches 1484 N. The theoretical force at 1.0 MPa is 168 kgf.
Choose the SCD when you need exactly the same force and speed in both directions, or when you need to attach tooling, a stop, or a sensor flag to the rear rod. A single-rod SC cylinder has a higher push force due to the full piston area, but its pull force is lower. The double-rod design also provides better rod bearing support, though it is not a substitute for a fully guided cylinder under side loads.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.