The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X50-30S 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, 50mm nominal stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCJ250X50-30S is a double-acting, single-rod cylinder from the SCJ series, providing a nominal 50 mm stroke that is field-adjustable by up to 30 mm via a rear-cap screw. This large-bore 250 mm unit delivers a substantial 24544 N of push force at just 0.5 MPa, making it a powerhouse for heavy industrial positioning tasks. The built-in magnet (suffix -S) allows direct mounting of CMSG/DMSG/EMSG sensors along the barrel for precise end-of-stroke or mid-stroke position feedback.
This tie-rod cylinder, conforming to the ISO 6430 class for big bores, uses a 50 mm diameter piston rod with an M42x2 thread and a 1-inch PT port. Its adjustable air cushion decelerates the piston smoothly over a 40 mm length, protecting the end cap during high-energy stops. The body length A(SCJ) is 409 mm, providing a robust platform for heavy-duty applications where the stroke end point needs regular fine-tuning without cylinder replacement.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X50-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 50 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. |
| ×50 | 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. The 30 mm adjust range allows operators to compensate for tooling wear or material thickness changes without disassembling the tooling, using the cylinder's 24544 N push force at 0.5 MPa.
Maintain optimal belt tension on a heavy-duty mining conveyor. The adjustable stroke lets maintenance crews take up belt stretch over time, applying a controlled, high-force tension via the SCJ250's robust 50 mm rod and tie-rod construction.
Precisely set the position of a steel slab guide in a rolling mill. The rear adjusting screw provides a repeatable mechanical stop, and the built-in magnet (S) allows sensors to confirm the guide is in the correct position before a pass begins.
Choose the SCJ250 when you need the highest force in the SCJ range—its 24544 N push at 0.5 MPa is a significant step up from the 15708 N of the SCJ200. For applications requiring even more force, an external intensifier or a larger custom cylinder would be needed. The 30 mm adjustable stroke is ideal for commissioning and wear take-up on large-scale equipment. If your application requires a fixed, non-adjustable stroke, the standard SC250 is a more economical alternative.
This model includes a built-in magnet for sensor compatibility. For a direct replacement, match the 250 mm bore, 50 mm nominal stroke, 30 mm adjust range, PT port thread, and the basic mounting style. If side-loads are a concern, even with a short 50 mm stroke, the large rod diameter provides significant rigidity, but an external guide rail is recommended for off-axis loads to protect the rod bearing and seals.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N (due to the 50 mm rod area). The maximum push force at the 0.9 MPa operating limit is 44178 N. The rear adjusting screw changes only the stroke end position, not the cylinder's output force.
Yes, it can replace an SC250 of the same nominal 50 mm stroke if you require field adjustability. The SCJ250 has a slightly longer body (409 mm) to house the adjusting screw. Ensure the mounting, port thread (1-inch PT), and magnet option (S) match your current setup. The SCJ uses the same mounting accessories as the SC, like the FA, LB, and TC brackets.
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