The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X350-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø80mm bore, 350mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X350-20S is an 80 mm bore double-acting single-rod cylinder delivering a substantial 2513 N of push force at 0.5 MPa, making it suitable for medium-duty pressing, clamping, and material-handling tasks. Its defining feature is the rear-cap adjusting screw, which provides up to 20 mm of fine-tuned stroke-end adjustment, allowing operators to dial in the exact stopping position without replacing the cylinder or adding external hard stops.
This model includes a built-in magnet (-S), enabling direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for reliable, non-contact end-of-stroke detection. With a 25 mm diameter piston rod, PT3/8 ports, and a 28 mm air cushion, the cylinder body length A is 239 mm. The maximum standard stroke for this bore is 1500 mm, so the 350 mm nominal stroke is well within standard limits.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X350-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 350 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT3/8 |
| Rod thread | M20×1.5 |
| 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 SCJ (adjustable-stroke) datasheet. The rear adjusting screw sets the stroke end position; force is the same as the equivalent single-rod SC bore. Confirm against the product label before installation. Thread options: PT (standard) / G.
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
SCJ is single-rod, so force matches the equivalent SC bore: push uses the full bore area, pull subtracts the rod area. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 80 | Bore size in mm. |
| ×350 | Nominal (maximum) stroke length in mm. |
| -20 | Adjustable-stroke range in mm (options 10/20/30/40/50/75/100). |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod, fixed stroke), SCD (double rod), SCT (multi-position). SCJ mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
During machine setup, the 20 mm adjusting screw allows engineers to precisely set the end-of-stroke position for a pusher or stop, compensating for small assembly tolerances without needing to machine custom spacers.
On a packaging line, the stroke can be quickly adjusted to accommodate different box sizes or product heights, minimizing downtime during batch changes. The built-in magnet provides sensor feedback for the new position.
In high-cycle clamping fixtures, the stroke end can be incrementally advanced over time to compensate for wear on contact pads or tooling, maintaining consistent clamping force without immediate part replacement.
Choose the SCJ80X350-20S when your application requires a powerful 80 mm bore actuator with the flexibility to fine-tune the stroke end by up to 20 mm on the machine. If you need more force, stepping up to the 100 mm bore provides 3927 N of push at 0.5 MPa; for a lighter, more compact solution, the 63 mm bore offers 1559 N. For applications where the stroke is fixed and will never need adjustment, the standard SC80X350 fixed-stroke cylinder is a simpler, more cost-effective alternative.
For a direct replacement, match the 80 mm bore, 350 mm nominal stroke, 20 mm adjust range, PT3/8 ports, and the built-in magnet (-S). Since this is a 350 mm stroke, be mindful of side-loading; if the rod is pushing a non-guided load, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this 80 mm bore cylinder generates 2513 N of push force and 2268 N of pull force. The push force is higher because the single piston rod reduces the effective area on the return stroke. The maximum push force at 0.9 MPa is 4523 N.
This SCJ80X350-20S is a direct replacement for any AirTAC SCJ adjustable-stroke cylinder with an 80 mm bore, a 350 mm nominal stroke, a 20 mm adjustment range, PT3/8 ports, and a built-in magnet. It is not dimensionally interchangeable with ISO 15552 cylinders from other brands.
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