The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-50 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. Ø50mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X300-50 delivers a nominal 300 mm stroke with a 50 mm rear adjusting screw, letting you dial the stroke end position anywhere between 250 and 300 mm without removing the cylinder. Its 50 mm bore and 20 mm piston rod generate 982 N of push force at 0.5 MPa, making it a practical mid-range actuator for applications that need field-tunable travel.
This double-acting, single-rod cylinder uses PT1/4 ports, an M16x1.5 rod thread, and a 21 mm air cushion to decelerate the piston quietly. The tie-rod body (A dimension 194 mm) is slightly longer than a fixed-stroke SC of the same bore, and the adjustable screw only sets the stroke end—it does not alter the bore's force output or speed capability.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 mm |
| Stroke adjustment | Up to 50 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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, 21 mm |
| Max stroke | Up to 1200 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | 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.
During machine bring-up, the 50 mm adjustment range lets technicians tweak the end stop precisely without swapping shims or hard stops, cutting setup time on assembly stations.
On packaging lines that run multiple box sizes, the adjustable stroke allows a quick mechanical change of the pusher travel to match the new format, avoiding a full cylinder swap.
In clamping or pressing fixtures where tooling surfaces wear over time, the rear screw can be advanced slightly to restore the original clamped position without re-machining stops.
Step up to a 63 mm bore (1559 N push at 0.5 MPa) if the 982 N push force of this SCJ50 is marginal for your load. For a simpler, non-adjustable version, the fixed-stroke SC50X300 is a direct dimensional match. When replacing an existing SCJ, match the bore (50 mm), nominal stroke (300 mm), adjust range (-50), PT1/4 ports, and the basic mounting style. Because the 300 mm stroke is substantial, check for side-loading on the 20 mm rod; if the load is not perfectly guided, add an external linear guide or consider a guided cylinder to protect the rod bearing and seal.
Adjustable-stroke checklist
At 0.5 MPa it produces 982 N pushing and 825 N pulling; at the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The rear adjusting screw only sets the stroke end position within the 50 mm range—it does not change the bore area, rod diameter, or the force the cylinder can generate.
Yes, as long as the bore (50 mm), nominal stroke (300 mm), adjust range (-50), and port thread (PT1/4) match. This is a genuine AirTAC SCJ adjustable-stroke cylinder, so the mounting footprint, rod thread (M16x1.5), and body length are identical to the original SCJ50X300-50 design.
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