The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X1000-40 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø250mm bore, 1000mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X1000-40 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 40 mm of field-adjustable stroke-end reduction. This allows engineers to fine-tune the piston's end position without swapping the cylinder or adding external hard stops. It delivers a substantial 24544 N of push force at 0.5 MPa, rising to 44178 N at the maximum operating pressure of 0.9 MPa, making it suitable for heavy linear actuation tasks.
Built on a robust tie-rod construction with a 50 mm diameter piston rod and a 40 mm air cushion, this ISO 6430 class cylinder is designed for demanding industrial environments. The body length A is 409 mm, and the PT1" port supplies the large air volume needed for the 250 mm bore. The stroke-end adjustment screw only sets the retracted end position within the 40 mm range; it does not alter the cylinder's force output or maximum speed rating of 30-500 mm/s.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X1000-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 1000 mm |
| Stroke adjustment | Up to 40 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. |
| ×1000 | Nominal (maximum) stroke length in mm. |
| -40 | 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 final pressing depth in a large hydraulic or pneumatic press by adjusting the stroke end with the rear screw, accommodating tooling wear or different material thicknesses without disassembling the machine.
Use the 40 mm adjustable stroke to precisely set the open position of a heavy diverter gate on a conveyor line, allowing operators to compensate for mechanical slack or switch between product sizes quickly.
In a welding or assembly fixture for large structures, the adjustable stroke allows the clamping cylinder's retracted position to be dialed in perfectly during setup, ensuring consistent part alignment across production runs.
Select this model when your application requires a powerful linear force—over 24500 N at standard shop air—and the flexibility to adjust the stroke end by up to 40 mm during commissioning or changeovers. If the force requirement is lower, stepping down to a 200 mm bore SCJ reduces push force to 15708 N at 0.5 MPa, saving energy and physical space. For applications needing a fixed, non-adjustable stroke, the standard SC series is a more economical choice.
This cylinder is a direct replacement for another AirTAC SCJ250X1000-40 with PT ports and basic mounting. Given the 1000 mm stroke length, carefully assess side-loading conditions; the 50 mm rod provides good rigidity, but for off-center loads, an external guide rail or a guided cylinder is strongly recommended to prevent rod bending and premature seal wear. The mounting style can be upgraded with FA, LB, or TC trunnion kits from the F-SC250 accessory range.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. The force increases linearly with pressure, reaching a maximum push force of 44178 N at 0.9 MPa. Because it is a single-rod cylinder, the push force is always greater than the pull force due to the area of the 50 mm rod.
You can replace a fixed-stroke SC250X1000 cylinder with this SCJ250X1000-40 if you need the ability to shorten the stroke end by up to 40 mm. Ensure the port thread (PT1"), mounting style, and magnet options match your current setup. The SCJ body is slightly longer than the SC to house the adjustment mechanism.
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