Airtac SCD Standard Cylinder SCD63X312S
The AirTAC Airtac SCD Standard Cylinder SCD63X312S 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, 312mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ63 mm
- Rod (both ends)Ø20 mm
- Stroke312 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD63X312S
The SCD63X312S delivers identical force in both directions because the 20 mm rod passes through both end caps, subtracting the same area from each side of the piston. At 0.5 MPa you get 1402 N of thrust whether extending or retracting, and at the maximum operating pressure of 0.9 MPa that rises to 2523 N, giving a predictable output for tooling mounted on either rod end.
This 312 mm stroke model includes a built-in magnet (-S suffix), so you can clip CMSG, DMSG or EMSG reed or solid-state sensors directly onto the tie-rod barrel for end-of-stroke or mid-position sensing. The body length A(SCD) is 210 mm, and the adjustable pneumatic cushion at each end (28 mm long) helps decelerate the piston smoothly without external shock absorbers.
Airtac SCD Standard Cylinder SCD63X312S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD63X312S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø63 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 312 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.
Theoretical Output Force (Ø63mm, double rod)
| 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.
Model Code: Airtac SCD Standard Cylinder SCD63X312S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 63 | Bore size in mm. |
| ×312 | 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.
Where the Airtac SCD Standard Cylinder SCD63X312S Is Used
Two-Sided Transfer Shuttle
The equal 1402 N push/pull force and protruding rear rod make this cylinder ideal for a shuttle table where a tool or stop block is mounted on each end, moving a part between two stations with identical thrust.
Rear-Mounted Stroke Sensing
With the built-in magnet, you can mount CMSG sensors on the rear rod's path to confirm full retraction, a clean setup for presses or clamping fixtures where the front end is inaccessible.
Non-Rotating Alignment Pusher
The dual-rod support provides better resistance to rod rotation than a single-rod cylinder, useful for pushing components into a nest where a flat face must stay aligned without adding an external guide.
Is the Airtac SCD Standard Cylinder SCD63X312S the Right Cylinder?
Choose this 63 mm bore when the 50 mm SCD's 825 N at 0.5 MPa is too light for your two-sided fixture. If you need even more force, the 80 mm bore provides 2268 N at the same pressure. For a single-rod application where push force must be higher than pull, switch to the SC63 series instead. A through-rod design improves guidance, but if your 312 mm stroke carries a true side load, pair the cylinder with an external guide rail or step up to a guided cylinder.
As a direct replacement, match five points: 63 mm bore, 312 mm stroke, PT port thread, the same SCD mounting accessory (this unit is basic, so no bracket), and the -S magnet option. The F-SC63 series mounting kits—FA front flange, LB foot, or TC centre trunnion with TCM1 bracket—can be added later if your mounting needs change.
Double-rod checklist
- ✓ Need equal force / speed both directions?
- ✓ Rear rod for tooling, stopper or sensor flag?
- ✓ Better rod guidance / anti-rotation?
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Keep BOTH rod ends clear of side load and interference.
- check Adjust end cushion screws for smooth stops.
- check Use SCD mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCD Standard Cylinder SCD63X312S FAQ
Push and pull force are identical on this double-rod cylinder. At 0.5 MPa you get 1402 N, at 0.7 MPa it is 1962 N, and at the max operating pressure of 0.9 MPa the force reaches 2523 N. The theoretical force at 1.0 MPa is 286 kgf.
Choose the SCD when you need equal force and speed in both directions, or when you want to attach tooling, a stop, or a sensor flag to the rear rod. The through-rod also gives the piston better bearing support, reducing rod deflection compared to a single-rod SC of the same stroke, though it is not a replacement for a fully guided cylinder under heavy side loads.
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