Airtac SCD Standard Cylinder SCD125X75S
The AirTAC Airtac SCD Standard Cylinder SCD125X75S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø32mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø125mm bore, 75mm stroke, PT1/2 ports and adjustable end cushioning.
- BoreØ125 mm
- Rod (both ends)Ø32 mm
- Stroke75 mm
- Port sizePT1/2
- Rod configDouble rod (through)
- CushionAdjustable, 28 mm
About the Airtac SCD Standard Cylinder SCD125X75S
The SCD125X75S is a double-acting, double-rod pneumatic cylinder delivering perfectly symmetrical force in both directions—5734 N at 0.5 MPa, rising to 10321 N at 0.9 MPa. With a 32 mm diameter rod passing through both end caps, it provides equal push and pull thrust, making it ideal for applications where a rear rod extension is needed for tooling, a stopper bolt, or an external sensor flag.
This model features a built-in magnet (denoted by the -S suffix), allowing CMSG, DMSG, or EMSG reed and solid-state sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. The 125 mm bore belongs to the ISO 6430 class, with a speed range of 30-500 mm/s. Its adjustable air cushion (28 mm length) decelerates the piston smoothly at both ends of the 75 mm stroke, and the body length A(SCD) is 291 mm.
Airtac SCD Standard Cylinder SCD125X75S Technical Specifications
| Model | Airtac SCD Standard Cylinder SCD125X75S |
|---|---|
| Series | SCD double-rod tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø125 mm |
| Rod diameter | Ø32 mm (both ends) |
| Stroke | 75 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/2 |
| Rod thread | M27×2 |
| 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 – 500 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 (Ø125mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | 8027 N |
| Max (@1.0 MPa) | 1169 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 SCD125X75S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 125 | Bore size in mm. |
| ×75 | 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 SCD125X75S Is Used
Bidirectional Clamping Fixture
The equal 5734 N force in both directions makes this cylinder perfect for a central clamping station where two opposing fixtures must close with identical pressure, driven by the front and rear rod extensions.
Rear-Position Sensing Gate
The built-in magnet allows a DMSG sensor to be mounted on the rear side of the cylinder to confirm full retraction, while the front rod actuates a diverter gate. The 32 mm through-rod provides a stable, non-rotating surface for the sensor target.
Symmetric Press Tool
Use the rear rod to mount a counter-pressure plate or a return-stop bolt. The double-rod design ensures the 10321 N thrust at 0.9 MPa is delivered with zero force differential between the push and pull strokes, crucial for precision pressing.
Is the Airtac SCD Standard Cylinder SCD125X75S the Right Cylinder?
The SCD125X75S suits tasks needing equal bidirectional force in a compact 75 mm stroke, such as a two-sided press or a shuttle gate. If your force requirement is lower, the SCD100 bore provides 3681 N at 0.5 MPa; for higher thrust, the SCD160 bore delivers 9425 N. Remember that a double-rod cylinder is not a guided cylinder—if your application imposes significant side loads on the extended rods, use an external linear guide or switch to a dedicated guided cylinder.
For a direct replacement, match the bore (125 mm), stroke (75 mm), PT port thread, basic mounting style, and the -S magnet option. This cylinder replaces another AirTAC SCD125X75S of identical configuration. The through-rod design offers better bearing support than a single-rod cylinder, but long-term wear on the rod bearings is a factor in high-cycle applications.
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 SCD125X75S FAQ
Because it is a double-rod cylinder, the push and pull forces are identical. At 0.5 MPa it outputs 5734 N, at 0.7 MPa it outputs 8028 N, and at the maximum operating pressure of 0.9 MPa it outputs 10321 N. The theoretical force at 1.0 MPa is 1169 kgf.
Choose the SCD when you need a rear rod extension to mount tooling, a mechanical stop, or a sensor flag, or when you require perfectly equal force and speed in both directions. A single-rod SC cylinder has a higher push force due to the full piston area, but its pull force is lower. The SCD's through-rod also provides better guidance and natural anti-rotation compared to a standard single-rod cylinder.
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