The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X300-75S 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X300-75S is a 50 mm bore double-acting single-rod pneumatic cylinder with a rear-cap adjusting screw that provides a 75 mm field-adjustable stroke range. At 0.5 MPa it delivers 982 N of push force and 825 N of pull force, suiting it to medium-force positioning tasks where the stroke end must be fine-tuned on the machine.
This model includes a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel, and its 20 mm diameter piston rod with M16x1.5 thread provides robust guidance. The adjustable air cushion is 21 mm long, and the body length A(SCJ) is 194 mm, making it slightly longer than a fixed-stroke SC of the same bore.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X300-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 300 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. |
| ×300 | 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 adjust range lets technicians dial in the exact stroke end position during machine commissioning without fabricating external hard stops, speeding up line start-up.
On packaging or assembly lines, quickly re-set the cylinder stroke for different product sizes by turning the rear screw, eliminating the need to swap out the cylinder for each format.
In clamping or pressing operations, the adjustable stroke can be used to take up mechanical wear in tooling or fixtures over time, maintaining consistent contact pressure without reprogramming.
Choose this 50 mm bore when your application needs around 982 N of push force at standard plant air. If you require more force, stepping up to a 63 mm bore delivers 1559 N push at 0.5 MPa; for a lighter, more compact solution, the 40 mm bore provides 628 N. The SCJ is the right choice when you need to commission a stroke end position or accommodate format changes without swapping the cylinder—if your stroke is fixed and never changes, a standard SC series cylinder is a more economical pick.
For this 300 mm stroke, be mindful of side loading on the extended rod. If the load is not perfectly guided, consider adding an external linear guide or switching to a guided cylinder to prevent rod bending and premature seal wear. A direct replacement must match the 50 mm bore, 300 mm nominal stroke, 75 mm adjust range, PT port thread, and the built-in magnet option.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder delivers 982 N of push force and 825 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 0.9 MPa, the push force reaches 1767 N.
Only if you no longer need the adjustable stroke feature. The SCJ's rear adjusting screw allows you to shorten the stroke end by up to 75 mm. A standard SC cylinder has a fixed stroke and cannot provide this field adjustability. For a direct SCJ replacement, match the 50 mm bore, 300 mm nominal stroke, 75 mm adjust range, and the -S magnet option.
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