Airtac SCD Standard Cylinder SCD40X250S
The AirTAC Airtac SCD Standard Cylinder SCD40X250S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø16mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø40mm bore, 250mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke250 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac SCD Standard Cylinder SCD40X250S
The SCD40X250S provides perfectly balanced bidirectional force, outputting 528 N in both extend and retract at 0.5 MPa thanks to its double-rod design. The 16 mm diameter rod passes through both end caps, giving you a rear rod extension that is ideal for mounting a sensor flag, a manual override, or secondary tooling without adding an external bracket.
This model includes a built-in magnet (-S suffix), so you can directly clamp a CMSG, DMSG, or EMSG reed or solid-state sensor onto the tie-rod barrel for clean, reliable end-of-stroke detection. With a 250 mm stroke and a body length A of 191 mm, it fits compactly into transfer stations and dual-sided fixtures where space is at a premium.
Airtac SCD Standard Cylinder SCD40X250S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD40X250S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 250 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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.
Theoretical Output Force (Ø40mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 528 N | 528 N |
| 0.7 MPa | 739 N | 739 N |
| Max (@1.0 MPa) | 108 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 SCD40X250S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SCD40X250S Is Used
Bidirectional Transfer Shuttles
The equal 528 N push and pull force makes this cylinder perfect for shuttle tables that move a part between two stations, ensuring consistent speed and thrust in both directions.
Sensor-Controlled Staging
The built-in magnet allows a DMSG sensor to be mounted on the rear rod side, confirming the piston has fully retracted before the next machine cycle initiates, a clean solution for staging parts.
Non-Rotating Alignment Tools
With a rod on both ends, the piston is better supported against twisting, making the SCD40X250S a solid choice for a push-pull alignment fixture where rod rotation must be minimized.
Is the Airtac SCD Standard Cylinder SCD40X250S the Right Cylinder?
Choose the SCD40 bore when your application needs around 528 N of force each way at standard plant pressure. If you require more thrust, stepping up to the SCD50 delivers 825 N at the same 0.5 MPa, while the smaller SCD32 provides 345 N for lighter, faster cycling tasks. For a 250 mm stroke, the double-rod configuration is excellent for maintaining alignment, but if the rear rod is not needed, a single-rod SC cylinder of the same bore will be shorter and more cost-effective.
This is a direct replacement for another AirTAC SCD40X250S unit matching the 40 mm bore, 250 mm stroke, PT port thread, basic mounting, and the -S magnet option. For strokes of this length, ensure the load is guided externally if significant side forces are present, as the through-rod provides better bearing support than a single rod but is not a guided cylinder.
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 SCD40X250S FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it produces 528 N, at 0.7 MPa it produces 739 N, and at the maximum operating pressure of 0.9 MPa it produces 950 N in both directions.
You would select the SCD when you need equal force and speed in both directions and a rear rod extension for mounting sensors, stops, or secondary tooling. The through-rod also provides better guidance and anti-rotation than a single-rod cylinder, though it does not replace a dedicated guided cylinder for high side loads.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCD Double-Rod Cylinders
Request a Quote for Airtac SCD Standard Cylinder SCD40X250S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.