The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø50mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X250-75 is a double-acting, single-rod pneumatic cylinder designed for applications where the stroke end position must be fine-tuned on the machine. A rear-cap adjusting screw provides up to 75 mm of retraction from the 250 mm nominal stroke, enabling precise setup without changing the cylinder body.
This 50 mm bore model delivers 982 N of push force at 0.5 MPa and 1767 N at the maximum operating pressure of 0.9 MPa. It features a 20 mm diameter piston rod, PT1/4 ports, and an adjustable air cushion for smooth deceleration. The body length (A dimension) is 194 mm plus stroke, making it a compact solution for stroke-critical automation.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 75 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. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -75 | 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 75 mm adjustment range lets technicians quickly dial in the exact stop position for a new machine without swapping cylinders or machining custom stops, reducing installation time.
On packaging lines, the stroke can be easily adjusted to handle different box sizes or product widths, providing flexible automation with a single cylinder model.
In clamping or pressing fixtures, the rear screw can be advanced over time to compensate for tooling wear, maintaining consistent contact force without reprogramming the machine.
Choose the SCJ50X250-75 when you need to dial in a stroke end position during commissioning or product changeovers. If your force requirement is lower, stepping down to the 40 mm bore (628 N push at 0.5 MPa) saves space; for higher force, the 63 mm bore provides 1559 N. For a fixed, non-adjustable stroke, the standard SC series is a simpler alternative.
At 250 mm of stroke, ensure the rod is adequately supported if significant side loads are present. An external guide rail or switching to a guided cylinder is recommended to prevent rod bending and premature seal wear. This model is a direct replacement for any AirTAC SCJ50X250-75 with PT ports and basic mounting.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N. The force increases linearly with pressure, reaching a maximum push of 1767 N at the 0.9 MPa operating limit.
A screw in the rear end cap acts as an internal stop for the piston. Turning the screw changes the retracted end position by up to 75 mm, effectively shortening the stroke from its 250 mm maximum. It does not alter the cylinder's force or speed.
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