The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X250-75S 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ50X250-75S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, delivering 982 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides up to 75 mm of stroke shortening, allowing machine builders to fine-tune the end position without swapping the cylinder or adding external hard stops. The 20 mm rod and PT1/4 ports suit mid-range clamping and positioning tasks.
This model includes a built-in magnet (-S suffix), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for non-contact position feedback. The 21 mm air cushion at each end decelerates the piston quietly, and the 194 mm body length A(SCJ) keeps the package compact for a 250 mm nominal stroke. The standard TPU seal operates reliably from -20 to +70 °C with filtered air.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X250-75S |
|---|---|
| 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 adjusting screw lets technicians dial in the exact stroke end position during machine bring-up, eliminating the need to stock multiple fixed-stroke cylinders for trial fits.
On packaging or assembly lines, operators can quickly adjust the cylinder stroke to accommodate different product sizes or formats without mechanical modifications.
In long-running fixtures, the adjustable stroke can be periodically tweaked to take up mechanical wear in linkages or tooling, maintaining consistent clamping or pressing depth over time.
Choose the SCJ50X250-75S when you need a 250 mm nominal stroke that can be shortened by up to 75 mm during commissioning or changeover. If 982 N push at 0.5 MPa is insufficient, stepping up to the 63 mm bore (SCJ63) provides 1559 N push at the same pressure. For applications that do not require stroke adjustment, the fixed-stroke SC50X250 is a simpler, slightly shorter alternative.
For a direct replacement, match the 50 mm bore, 250 mm nominal stroke, 75 mm adjustable range, PT port thread, and the built-in magnet. At a 250 mm stroke, ensure the rod is guided externally if side loads exceed 0.5 kg, or consider a guided cylinder to prevent rod bending and premature seal wear. The SCJ mounting subset includes FA front flange, LB foot, or TC centre trunnion with TCM1 bracket.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (the pull force is lower because the 20 mm 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.
Yes, provided the bore (50 mm), nominal stroke (250 mm), and port thread (PT) match. The SCJ body is slightly longer due to the adjusting mechanism, so check the 194 mm body length against your available space. The SCJ also requires you to set the stroke end screw to match the original fixed stroke.
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