The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X250-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø250mm bore, 250mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X250-30S is a heavy-duty double-acting single-rod pneumatic cylinder with a 250 mm bore and a nominal 250 mm stroke, delivering a substantial 24544 N of push force at 0.5 MPa. Its defining feature is the rear-cap adjusting screw, which provides up to 30 mm of field-adjustable stroke-end reduction, allowing operators to fine-tune the stopping position without removing the cylinder from the machine.
This ISO 6430 class tie-rod cylinder uses a robust 50 mm diameter piston rod and PT1 inch ports, with a 40 mm air cushion to decelerate the massive piston assembly. The built-in magnet (denoted by the S suffix) allows direct mounting of CMSG/DMSG/EMSG sensors along the barrel for reliable, non-contact position feedback. The body length A(SCJ) for this bore is 409 mm.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X250-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 30 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. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -30 | 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 bottom-dead-center position of a large forming press to compensate for tooling wear or different material thicknesses, using the 30 mm adjustment range to maintain precise part dimensions.
Calibrate the stroke of a massive gate or butterfly valve actuator on the plant floor, ensuring full-open and full-close positions are perfectly aligned with the valve body without complex linkage adjustments.
Adjust the end position of a heavy-gauge material diverter arm on a mining or aggregate conveyor, accommodating changes in material flow or chute alignment without needing to swap out the cylinder.
Select the SCJ250X250-30S when you need high force and the ability to dial in the stroke end position during setup or changeovers. If 24544 N of push force is excessive, stepping down to a 200 mm bore reduces push force to 15708 N at 0.5 MPa. For applications where the stroke is fixed and never needs adjustment, the standard SC fixed-stroke cylinder is a more economical choice. A direct replacement must match the 250 mm bore, 250 mm nominal stroke, 30 mm adjustment range, PT port thread, and the built-in magnet. For strokes of 300 mm or more, always assess side-loading on the 50 mm rod; an external guide rail or a switch to a guided cylinder is recommended to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder generates 24544 N of push force and 23562 N of pull force. The push force is higher because the single piston rod reduces the effective area on the return stroke. The maximum push force at 0.9 MPa is 44178 N.
A rear-cap screw lets you shorten the stroke end by up to 30 mm in the field, which is ideal for fine-tuning the stopping position. It is a direct dimensional and functional replacement for another AirTAC SCJ cylinder with the same 250 mm bore, 250 mm nominal stroke, 30 mm adjustment range, PT ports, and an S magnet. It is not a drop-in replacement for a fixed-stroke SC cylinder.
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