The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-50STC 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, 250mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X250-50STC is an 80 mm bore double-acting single-rod cylinder that puts field-adjustable stroke control directly on the machine. A rear-cap screw lets you shorten the stroke end by up to 50 mm without removing the cylinder, giving you a 200–250 mm working range from the nominal 250 mm stroke. At 0.5 MPa it delivers 2513 N push and 2268 N pull, with a 25 mm piston rod and PT3/8 ports.
This model ships with a built-in magnet (-S) for CMSG/DMSG/EMSG sensors and a centre trunnion mount (TC) plus the TCM1 bracket, so it can pivot under swinging loads. The adjustable air cushion decelerates the piston over the final 28 mm of travel, and the tie-rod construction keeps service straightforward. Body length A(SCJ) is 239 mm.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 250 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. |
| ×250 | 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.
Fine-tune the end position of a clamp or stop during machine commissioning. The 50 mm adjustment range lets technicians dial in the exact stroke without swapping cylinders or machining spacers.
On packaging or assembly lines that run multiple product sizes, adjust the stroke end to match a new box height or pallet dimension. One cylinder adapts to several formats in minutes.
In high-cycle pressing or crimping stations, the adjustable screw can be advanced to take up tooling wear or seal compression over time, maintaining consistent end-of-stroke force without replacing the actuator.
Choose the SCJ80X250-50STC when you need to dial in a stroke end precisely during commissioning or format changeovers on an 80 mm bore platform. If your force requirement drops, the 63 mm bore SCJ63 series provides 1559 N push at 0.5 MPa; if you need more, the 100 mm bore SCJ100 delivers 3927 N push at the same pressure. For a fixed-stroke application where adjustability is unnecessary, the standard SC80X250 is a simpler alternative.
At 250 mm nominal stroke, rod bending under side load is a manageable risk, but if the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder. To replace this unit, match an SCJ80 with a 250 mm nominal stroke, 50 mm adjust range, PT3/8 ports, centre trunnion mounting (F-SC80TC), and a built-in magnet.
Adjustable-stroke checklist
At 0.5 MPa the push force is 2513 N and the pull force is 2268 N (pull is lower because of the 25 mm single rod area). At the maximum operating pressure of 0.9 MPa, push force reaches 4523 N. The theoretical force at 1.0 MPa is 513 kgf.
The rear adjusting screw sets the stroke end position within a 50 mm range, shortening the nominal 250 mm stroke. It is a mechanical end-stop, not a locking device. The cylinder will drift if air pressure is lost; for load holding without live pressure, add an external rod lock or pilot-operated check valve.
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