The AirTAC Airtac SC40 Standard Cylinder SC40X685TC is a genuine double-acting standard air cylinder with a Ø40mm bore and 685mm stroke, PT1/4 air ports and adjustable end cushioning. It is used for push, pull, lift and clamp motion in industrial automation.
The SC40X685TC is a double-acting pneumatic cylinder delivering 628 N of push force at 0.5 MPa (1130 N at 0.9 MPa) from its 40 mm bore. With a 685 mm stroke, it suits mid-length linear transfer tasks, and the 16 mm diameter piston rod provides good column strength for push applications.
This model ships with the factory-installed TC centre trunnion mount and matching TCM1 bracket (part code F-SC40TC), allowing the cylinder body to pivot during operation. The tie-rod construction keeps the overall length compact at approximately 827 mm extended (body length A=142 mm + 685 mm stroke), and the adjustable air cushion at each end decelerates the piston smoothly over 21 mm.
| Model | Airtac SC40 Standard Cylinder SC40X685TC |
|---|---|
| Series | SC standard tie-rod cylinder |
| Bore size | Ø40 mm |
| Stroke | 685 mm |
| 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 SC series datasheet. Operating pressure 0.15–1.0 MPa, proof pressure 1.5 MPa, temperature −20 to +70 °C. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (approx.) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
| SC | Standard tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×685 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related variants: SCD (double rod), SCJ (adjustable stroke), SCT (multi-position). Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
The 685 mm stroke and pivoting trunnion mount allow the cylinder to swing a diverter gate across a conveyor line, sorting packages by route without binding.
Delivers consistent 628 N clamping force at standard shop air pressure, ideal for holding workpieces in CNC fixtures or welding jigs during automated cycles.
The centre trunnion mount lets the cylinder body articulate as it opens and closes a discharge door on a bulk material hopper, handling the pivoting motion reliably.
For applications needing slightly more force, stepping up to the 50 mm bore SC50 series provides 982 N at 0.5 MPa, while the 32 mm bore offers 402 N if a smaller footprint is required. At 685 mm stroke, the rod is well-supported within the barrel, but any significant side load should be managed with an external linear guide to prevent rod bearing wear.
To ensure a correct replacement, match five key points: 40 mm bore, 685 mm stroke, PT port thread, centre trunnion (TC) mounting, and confirm the magnet requirement (this model has no built-in magnet). The SC40 is a tie-rod cylinder and is not dimensionally interchangeable with ISO 15552 profile cylinders.
Quick checklist
At 0.7 MPa operating pressure, the theoretical push force is 879 N. The pull force on the retract stroke is 528 N at 0.5 MPa, due to the area reduction from the 16 mm piston rod.
The TC suffix means the cylinder is supplied with a centre trunnion for pivoting motion. If you need a fixed, rigid mount, you should order a basic model or one with foot (LB) or flange (FA/FB) mounting, as the trunnion bracket is integral to this specific part code.
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