The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X70-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø80mm bore, 70mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X70-50S is an 80 mm bore, double-acting single-rod cylinder delivering 2513 N of push force at 0.5 MPa. Its rear adjusting screw provides a 50 mm field-adjustable stroke-end range, letting you fine-tune the 70 mm nominal stroke on the machine without swapping the cylinder or adding external hard stops.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The 25 mm diameter piston rod and PT3/8 ports handle flows for speeds up to 800 mm/s, while the 28 mm air cushion decelerates the load smoothly at stroke end.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X70-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 70 mm |
| Stroke adjustment | Up to 50 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. |
| ×70 | Nominal (maximum) stroke length in mm. |
| -50 | 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.
Dial in the exact stroke end position during machine commissioning. The 50 mm adjustment range on the SCJ80 lets technicians fine-tune the actuator throw without cutting brackets or re-machining stops.
Quickly adapt a pusher or diverter stroke for different product sizes on a packaging line. Operators adjust the rear screw to match the new box width, reducing downtime between production runs.
Take up mechanical play or seal wear in a clamping or pressing fixture over time. The adjustable stroke end on this 80 mm bore cylinder maintains consistent clamp force without replacing the tooling.
Choose the SCJ80 when your application needs around 2513 N of push force at standard plant air. If you require more force, step up to the 100 mm bore SCJ100 which delivers 3927 N push at the same 0.5 MPa. For lighter, faster moves, the 63 mm bore SCJ63 provides 1559 N push and a smaller footprint.
This SCJ80X70-50S is the correct replacement for an existing AirTAC SCJ adjustable-stroke cylinder of 80 mm bore, 70 mm nominal stroke, and 50 mm adjust range with PT ports, basic mounting, and a magnet. If your stroke does not need field adjustability, a fixed-stroke SC80X70-S offers a simpler, more compact alternative. For strokes of 300 mm or longer, evaluate side-loading on the 25 mm rod and consider adding an external guide or switching to a guided cylinder assembly.
Adjustable-stroke checklist
At 0.5 MPa, this 80 mm bore cylinder generates 2513 N of push force and 2268 N of pull force (the pull force is lower because the 25 mm rod reduces the piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force reaches 4523 N.
You can, provided the 50 mm stroke reduction is acceptable and the overall body length fits your machine. The SCJ body is slightly longer than a fixed-stroke SC of the same bore to house the adjusting screw. The mounting footprint and port locations are identical, so basic and FA/LB/TC mounts interchange directly.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.