The AirTAC Airtac SC40 Standard Cylinder SC40X685STC 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 AirTAC SC40X685STC is a double-acting tie-rod cylinder with a 40 mm bore and a 685 mm stroke, factory-equipped with a built-in magnet and a centre trunnion (TC) mounting. At 0.5 MPa it provides 628 N of push force and 528 N of pull force, rising to 1130 N push at 0.9 MPa. The 16 mm diameter piston rod carries an M12x1.25 thread, and the 21 mm adjustable air cushion at each end decelerates the load smoothly.
This model is built around a body length A of 142 mm, so the total extended length is approximately 827 mm. The TC mount includes the TCM1 trunnion bracket (F-SC40TC), letting the cylinder pivot freely to follow an arc without side-loading the rod. The -S magnet allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for reliable end-of-stroke detection.
| Model | Airtac SC40 Standard Cylinder SC40X685STC |
|---|---|
| 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 centre-trunnion pivot allow the cylinder to swing a pusher arm across a wide conveyor, diverting cartons or totes without binding.
Delivers 1130 N at 0.9 MPa to hold workpieces during machining or welding. The magnet enables sensor confirmation that the clamp is fully closed.
Operates a sliding gate on a bulk-material hopper. The trunnion mount absorbs the arc of a linkage, and the 21 mm cushion softens the stop under heavy flow.
Choose the SC40 when your application needs around 628 N of push force at standard plant air; if you need more, stepping up to the 50 mm bore (SC50) delivers 982 N at the same 0.5 MPa. For this 685 mm stroke, side-load and rod-bearing bending must be managed — use an external linear guide or a guided cylinder if the load is not perfectly axial, because the 16 mm rod can buckle under off-axis forces. When replacing an existing cylinder, match five points: 40 mm bore, 685 mm stroke, PT1/4 port thread, centre trunnion (TC) mounting with the TCM1 bracket, and the built-in magnet (-S) for sensor compatibility.
Quick checklist
At 0.5 MPa the cylinder pushes with 628 N and pulls with 528 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N. The theoretical maximum at 1.0 MPa is 128 kgf.
No. The SC is a tie-rod cylinder and is shorter than an ISO 15552 cylinder of the same bore and stroke, so mounting dimensions and body length are not interchangeable. It directly replaces another AirTAC SC40 tie-rod cylinder with matching bore, stroke, PT ports, TC mount, and magnet.
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