The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X500-20S 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, 500mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X500-20S is a double-acting, single-rod pneumatic cylinder engineered for heavy-duty applications requiring precise, field-adjustable stroke end positioning. With a 250 mm bore and a 50 mm rod, it delivers a substantial 24544 N of push force at 0.5 MPa, scaling up to 44178 N at the maximum operating pressure of 0.9 MPa. The rear-cap adjusting screw provides a 20 mm range to fine-tune the stroke end, making it ideal for commissioning large-scale equipment or compensating for wear without disassembling the actuator.
This model includes a built-in magnet (-S suffix), allowing direct mounting of CMSG, DMSG, or EMSG sensors along the barrel for reliable, non-contact position feedback. As an ISO 6430 class tie-rod cylinder, its robust construction features a PT1 inch port, an M42x2 rod thread, and a 40 mm air cushion for smooth deceleration. The body length A(SCJ) is 409 mm, providing a compact footprint for its force class.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X500-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 500 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. |
| ×500 | 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 material feed stop position on a large stamping press. The 20 mm adjustment screw allows operators to quickly compensate for tooling changes or material thickness variations without replacing the cylinder.
Set the precise end-of-travel for a large industrial damper or valve. The adjustable stroke ensures a perfect seal every time, and the built-in magnet provides open/closed position confirmation via sensors.
Maintain optimal belt tension on a high-capacity mining conveyor. The SCJ250's high force and 20 mm adjust range allow for easy take-up of belt stretch, while the tie-rod design withstands harsh, dusty environments.
Select the SCJ250 when your application demands the highest force in the SCJ family and the ability to dial in the stroke end by up to 20 mm. If your force requirements are slightly lower, stepping down to the 200 mm bore model (15708 N push at 0.5 MPa) can reduce physical size and air consumption. For a fixed, non-adjustable stroke, the standard SC series is a more economical choice, while a guided cylinder should be used if the 500 mm stroke introduces significant side-loading or rod deflection. This SCJ250X500-20S is a direct replacement for an AirTAC SCJ cylinder of identical bore, 500 mm nominal stroke, 20 mm adjust range, PT port, and built-in magnet.
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 force increases with pressure, reaching a maximum push force of 44178 N at 0.9 MPa. The pull force is lower due to the area of the 50 mm piston rod.
The 20 mm adjustment is made via a screw on the rear cap that limits the piston's retraction stroke end. It is a mechanical stop for position tuning, not a locking device. The cylinder will not hold a load if air pressure is lost; an external rod lock or pilot-operated check valve is required for load-holding safety.
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