The AirTAC Airtac SCJ80 Standard Cylinder SCJ80X300-50S 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, 300mm nominal stroke, PT3/8 ports and adjustable end cushioning.
The SCJ80X300-50S is an 80 mm bore double-acting single-rod cylinder with a 50 mm rear stroke-adjustment screw, giving you a field-tunable stroke end from 250 mm up to the nominal 300 mm. At 0.5 MPa it delivers 2513 N push and 2268 N pull, placing it in the mid-heavy force class for pressing, clamping, and format-change tooling.
This model includes a built-in magnet (-S suffix), so standard CMSG/DMSG/EMSG sensors clamp directly onto the tie-rod barrel for piston-position feedback. The 25 mm rod, PT3/8 ports, and 28 mm air cushion are standard for the bore. The body length A is 239 mm, slightly longer than a fixed-stroke SC of the same bore to house the adjusting screw.
| Model | Airtac SCJ80 Standard Cylinder SCJ80X300-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø80 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
The 50 mm adjusting screw lets technicians dial in the exact stroke end on a new machine without cutting guide rails or swapping cylinders, speeding up factory acceptance tests.
On a packaging line running multiple box heights, the adjustable stroke quickly resets the pusher end position between batches using the rear screw, eliminating mechanical stop rework.
In a high-cycle welding fixture, the stroke can be extended slightly via the screw to compensate for electrode tip wear, maintaining consistent clamp force without replacing the cylinder.
Step up to the 100 mm bore SCJ (3927 N push at 0.5 MPa) if this 80 mm unit is marginal on force; step down to the 63 mm bore (1559 N) when you need a lighter, faster actuator. For a fixed-stroke application without commissioning adjustment, the standard SC series is a simpler, lower-cost alternative. If the 300 mm stroke introduces side-loading on the rod, pair the cylinder with an external linear guide or switch to a guided cylinder to protect the rod bearing and seal.
For direct replacement, match an AirTAC SCJ cylinder with the same 80 mm bore, 300 mm nominal stroke, 50 mm adjust range, PT ports, basic mounting, and the -S magnet suffix. The SCJ family uses a subset of SC mounting accessories: FA front flange, LB foot, or TC centre trunnion with TCM1 bracket—no FB flange or CA/CB clevis mounts are available.
Adjustable-stroke checklist
At 0.5 MPa, push force is 2513 N and pull force is 2268 N (pull is lower due to the 25 mm rod area). At the maximum operating pressure of 0.9 MPa, push force reaches 4523 N. The 50 mm stroke-adjustment screw does not change these force values; it only sets the stroke end position.
Yes, provided your mounting and porting match. The SCJ80X300-50S has the same 80 mm bore, 300 mm nominal stroke, PT3/8 ports, and basic mount body as a fixed-stroke SC, but adds a rear adjusting screw that makes the overall body length slightly longer (239 mm A-dimension). Ensure you have clearance for the screw and that the -S magnet is required for your sensors.
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