The AirTAC Airtac SCD Standard Cylinder SCD63X40 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, 40mm stroke, PT1/4 ports and adjustable end cushioning.
The SCD63X40 is a double-acting pneumatic cylinder with a continuous piston rod extending from both ends, delivering an identical 1402 N of thrust in each direction at 0.5 MPa. Its 40 mm stroke and 20 mm diameter rod make it a compact choice for short, balanced linear movements where the rear rod can carry a sensor flag or secondary tooling.
This 63 mm bore model features a 28 mm adjustable air cushion at each end to decelerate the piston smoothly, protecting end-cap components. The body length A(SCD) is 210 mm, and the PT1/4 port supplies filtered air for consistent cycling in symmetrical push-pull operations.
| Model | Airtac SCD Standard Cylinder SCD63X40 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 40 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. |
| ×40 | 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 push-pull force of the SCD63X40 ensures consistent speed when shuttling small parts between two fixed stops on a short-stroke transfer line.
Mount a contact sensor on the front rod and a reference stop on the rear rod for a compact, self-contained dimensional checking station.
Actuate two opposing clamp arms from a single cylinder body, using the through-rod to drive a rear linkage that mirrors the front motion.
Choose the SCD63 when you need equal force in both directions without the asymmetry of a single-rod cylinder. If 1402 N at 0.5 MPa is too light, stepping up to the SCD80 provides 2268 N; if it exceeds your requirement, the SCD50 offers 825 N. For applications where only one end of the rod is accessible, a standard single-rod SC series cylinder is a simpler and more cost-effective alternative.
This is a genuine AirTAC SCD double-rod cylinder. To guarantee correct fit and performance, match a replacement unit on five points: 63 mm bore, 40 mm stroke, PT port thread, the specific SCD mounting accessory (basic, FA, LB, or TC), and the presence or absence of the -S magnet option.
Double-rod checklist
Because the piston rod passes through both ends, the effective pressure area is identical for extension and retraction. At 0.5 MPa the output is 1402 N, at 0.7 MPa it is 1962 N, and at the maximum operating pressure of 0.9 MPa it reaches 2523 N in both directions.
A double-rod cylinder provides equal force and speed in both directions and gives you a second rod end to mount tooling, a stop, or a position sensor. The through-rod also improves bearing support and resists rotation better than a single-rod design, though it is not a replacement for a fully guided cylinder under high side loads.
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