The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X120-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X120-20 is a double-acting, single-rod pneumatic cylinder from AirTAC that puts stroke-end adjustment directly on the machine. Its rear-cap screw lets you shorten the effective stroke by up to 20 mm in the field, so you can dial in the exact end position during commissioning or format changes without replacing the cylinder. The 50 mm bore delivers 982 N of push force at 0.5 MPa, rising to 1767 N at 0.9 MPa, while the 20 mm piston rod and PT1/4 ports keep the package compact.
Built on a proven tie-rod platform, this SCJ model shares the same mounting and sensor ecosystem as the fixed-stroke SC series. The body length A(SCJ) is 194 mm, slightly longer than the equivalent SC to house the adjusting mechanism. A 21 mm air cushion at each end decelerates the piston quietly, and the standard TPU seals cover the -20 to +70 °C range. This unit is a genuine AirTAC adjustable-stroke cylinder, ready to ship from AirtacDistr.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X120-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 20 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. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
Dial in the exact end-stop position during machine build or line commissioning. The 20 mm rear screw lets technicians fine-tune the stroke without dismounting the cylinder or machining external stops.
Adjust the stroke end to handle different box sizes or product formats on a packaging line. One SCJ50X120-20 replaces multiple fixed-stroke cylinders, reducing changeover time and spares inventory.
Take up mechanical wear in grippers, clamps, or press tools over time. The rear adjusting screw restores the precise end position without replacing the cylinder or adding shims.
Choose the SCJ50X120-20 when you need to fine-tune the stroke end by up to 20 mm on a 50 mm bore platform. If your force requirement is lower, stepping down to the 40 mm bore (628 N push at 0.5 MPa) saves space and air consumption; for heavier loads, the 63 mm bore provides 1559 N at the same pressure. The adjustable stroke is ideal for commissioning trials, wear take-up, or multi-format tooling, but if your application demands a fixed, repeatable stroke with no field adjustment, the standard SC50X120 is a simpler choice. For replacement, match the bore, nominal 120 mm stroke, 20 mm adjust range, PT port thread, and basic mounting. At 120 mm stroke, the rod is well supported, but if side loads are present, add an external guide rail or consider a guided cylinder.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 982 N and the pull force is 825 N (reduced by the 20 mm rod area). At the maximum operating pressure of 0.9 MPa, push force reaches 1767 N. The adjustable stroke screw does not alter the force output.
Yes, provided the mounting and porting match. The SCJ50X120-20 has the same bore, rod, and port dimensions as the SC50X120 but adds a rear adjusting screw, making the body slightly longer (194 mm A-length). Ensure the extra length fits your machine envelope.
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