The AirTAC Airtac SCD Standard Cylinder SCD63X550 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. Ø63mm bore, 550mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD63X550 is a double-acting, double-rod pneumatic cylinder delivering perfectly symmetrical force in both directions—1402 N of push and pull at 0.5 MPa, rising to 2523 N at 0.9 MPa. Because the 20 mm piston rod extends through both end caps, the effective pressure area is identical on each side, making this actuator ideal for applications where balanced speed and thrust are critical, such as operating tooling on both ends or driving a reciprocating mechanism with a rear-position feedback flag.
This 63 mm bore model features a 28 mm adjustable air cushion at each end to decelerate the piston smoothly, reducing end-of-stroke impact. With a body length A(SCD) of 210 mm and a 550 mm stroke, the overall retracted length is significantly longer than an equivalent single-rod cylinder due to the rod protruding from the rear cap. It uses PT1/4 ports and an M16x1.5 rod thread, and is built on the standard AirTAC tie-rod platform, not an ISO 15552 profile.
| Model | Airtac SCD Standard Cylinder SCD63X550 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 550 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, 28 mm |
| Max stroke | Up to 1500 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 | 1402 N | 1402 N |
| 0.7 MPa | 1962 N | 1962 N |
| Max (@1.0 MPa) | 286 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). |
|---|---|
| 63 | Bore size in mm. |
| ×550 | 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 force in both directions makes the SCD63X550 perfect for shuttle tables that move a fixture back and forth, ensuring consistent acceleration and deceleration regardless of travel direction.
With a rod on each end, you can mount a pressing tool on the front and a stripper plate or secondary forming die on the rear, performing two operations in one compact pneumatic stroke.
The rear rod extension provides a clean, accessible surface for mounting a sensor flag or cam, allowing you to monitor stroke position without interfering with the primary load on the front rod end.
Choose the SCD63X550 when your application requires identical push and pull output without the force asymmetry of a single-rod cylinder. If you need more force, stepping up to the SCD80 bore provides 2268 N at 0.5 MPa, while the SCD50 offers 825 N for lighter, more compact tasks. For strokes of 550 mm, be mindful of the long unsupported rod length on the rear side; while the through-rod design improves guidance compared to a single-rod SC, it is not a substitute for an external guide or a guided cylinder under significant side load. This model is a direct dimensional replacement only for another AirTAC SCD63 cylinder with matching 550 mm stroke, PT ports, and basic mounting—always verify port thread and cushion style when swapping.
Double-rod checklist
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it outputs 1402 N, at 0.7 MPa it delivers 1962 N, and at the maximum operating pressure of 0.9 MPa it reaches 2523 N in both directions.
Choose the SCD when you need perfectly balanced force and speed for both extend and retract strokes, or when you require a second rod end to mount tooling, a mechanical stop, or a position sensor. The through-rod also provides better support for the piston, reducing uneven bushing wear in applications with frequent cycling.
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