The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X160-20 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. Ø250mm bore, 160mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X160-20 is a double-acting, single-rod pneumatic cylinder engineered for heavy-duty applications requiring field-adjustable stroke end positioning. With a 250 mm bore and a nominal stroke of 160 mm, the rear-cap adjusting screw provides up to 20 mm of retraction adjustment, allowing operators to fine-tune the piston stop without removing the cylinder from the machine. This ISO 6430 class tie-rod cylinder delivers a substantial push force of 24544 N at 0.5 MPa and uses a 50 mm diameter piston rod with a 1-inch PT port.
Designed for robust industrial environments, the SCJ250X160-20 features an adjustable air cushion with a 40 mm cushion length to decelerate large inertial loads smoothly. The standard operating pressure ranges from 0.15 to 1.0 MPa, with a proof pressure of 1.5 MPa. Its body length A(SCJ) is 409 mm, and it operates within a temperature range of -20 to +70 °C using the default TPU seal material, making it a reliable choice for format changes or commissioning trials on large-scale equipment.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X160-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 160 mm |
| Stroke adjustment | Up to 20 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1" |
| Rod thread | M42×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 | 24544 N | 23562 N |
| 0.7 MPa | 34361 N | — |
| Max (@1.0 MPa) | 5006 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. |
|---|---|
| 250 | Bore size in mm. |
| ×160 | 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.
Fine-tune the retract end-stop on large forming or stamping presses during initial setup and die trials, using the 20 mm adjustment to achieve precise tool alignment without dismounting the cylinder.
Adjust the stroke end on a diverter gate for large aggregate or scrap material, allowing operators to compensate for wear on the gate seal or change the opening clearance for different material sizes.
Dial in the final position of a log carriage stop on a large bandsaw, using the rear screw to set the precise cutting width for different board dimensions during batch changeovers.
Choose the SCJ250X160-20 when you need the high force capacity of a 250 mm bore—24544 N push at 0.5 MPa—combined with the ability to dial in the stroke end position during setup. If your application requires even greater force, consider stepping up to a larger custom solution, as this is the largest standard SCJ bore. For applications needing less force, the SCJ200 series provides 15708 N of push at the same pressure. The adjustable stroke is ideal for taking up mechanical wear or adapting to varying workpiece thicknesses, but if your application demands a fixed, repeatable stroke with no field adjustment, the standard SC fixed-stroke cylinder is a more economical alternative.
For this 160 mm nominal stroke, side-loading is generally not a primary concern given the 50 mm rod diameter, but always ensure the load is guided externally if significant radial forces are present. To replace an existing unit, match the 250 mm bore, 160 mm nominal stroke, 20 mm adjust range, PT port thread, and basic mounting configuration. If magnetic piston sensing is required for end-of-stroke detection, specify the -S suffix to enable use with CMSG/DMSG/EMSG sensors.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N. The push force is higher because the single piston rod reduces the effective area on the return stroke. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N.
The rear-cap adjusting screw mechanically limits the retract stroke end, allowing you to shorten the effective stroke by up to 20 mm from the 160 mm nominal maximum. Choose this SCJ model when you need to fine-tune the end position on the machine during commissioning, compensate for tooling wear, or accommodate different product sizes without swapping the cylinder. If your process requires a permanent, unchanging stroke length, the standard SC fixed-stroke cylinder is a simpler choice.
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