The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X250-30STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø80mm bore, 250mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X250-30STC is an 80 mm bore double-acting single-rod cylinder that lets you fine-tune the stroke end by up to 30 mm via a rear-cap adjusting screw, without removing the cylinder from the machine. With a 25 mm diameter rod and a PT3/8 port, it delivers 2513 N of push force at 0.5 MPa, rising to 4523 N at 0.9 MPa.
This model is factory-equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors and a centre trunnion pivot (TC) that ships with the TCM1 bracket, making it ready for swinging loads. The adjustable air cushion decelerates the piston over the final 28 mm of travel, and the body length A(SCJ) is 239 mm.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X250-30STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 30 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. |
| -30 | 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.
The 30 mm adjusting screw lets technicians fine-tune the end-stop position during machine commissioning, compensating for tooling tolerances without swapping cylinders or machining external hard stops.
On packaging or assembly lines that run multiple product sizes, operators can quickly adjust the stroke end to suit a new format, reducing downtime between batches.
As gripper pads, press tools, or sealing jaws wear over time, the stroke can be incrementally lengthened to maintain consistent contact pressure and part engagement.
Choose the SCJ80 when your application needs roughly 2500 N of push at standard plant air; the adjustable stroke is ideal for commissioning or format changes where the end position must be dialled in on-site. If you need more force, step up to the 100 mm bore (3927 N push at 0.5 MPa); for a lighter, more compact solution, the 63 mm bore offers 1559 N. Because the nominal stroke is 250 mm, rod buckling is not a primary concern for most guided loads, but if the load is completely unguided, consider an external guide rail or a guided cylinder.
For a direct replacement, match the 80 mm bore, 250 mm nominal stroke, 30 mm adjust range, PT port thread, centre trunnion mounting (F-SC80TC), and the magnet option. If you do not need field adjustability, the fixed-stroke SC80X250-S is the equivalent non-adjustable model.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 2513 N and the pull force is 2268 N (the rod reduces the effective piston area on the return stroke). At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 5026 N. Always apply a safety factor for dynamic loads.
Yes, provided the mounting and porting match. The SCJ80X250-30 has the same 80 mm bore, 25 mm rod, and PT3/8 ports as an SC80, but the body is slightly longer to house the adjusting screw. You must also ensure the 30 mm adjustment range does not interfere with your machine's cycle. The TC trunnion mount on this model requires the F-SC80TC bracket.
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