The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X150-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø250mm bore, 150mm nominal stroke, PT1" ports and adjustable end cushioning.
The AirTAC SCJ250X150-50S 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, making it suitable for large-scale pressing, clamping, and material handling tasks. The rear-cap adjusting screw provides up to 50 mm of stroke-end reduction from the 150 mm nominal stroke, allowing operators to fine-tune the piston's stopping point without disassembling the cylinder or adding external hard stops.
This model features a built-in magnet (-S suffix), enabling direct mounting of CMSG, DMSG, or EMSG sensors along the barrel for non-contact position feedback. It is an ISO 6430 class tie-rod cylinder with a 1-inch PT port, M42x2 rod thread, and a 40 mm air cushion for smooth deceleration. The body length (A dimension) is 409 mm, providing a robust platform for industrial automation where consistent, adjustable motion is critical.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X150-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 150 mm |
| Stroke adjustment | Up to 50 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. |
| ×150 | Nominal (maximum) stroke length in mm. |
| -50 | 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 press depth for bearing or bushing insertion by adjusting the stroke end screw, ensuring consistent assembly quality without reprogramming the press controller.
Use the 50 mm adjustment range to create a precise, repeatable end-stop for large pallets or engine blocks on a conveyor line, accommodating different product sizes on the fly.
Dial in the exact clamp closing position for large injection molds or die-casting tools, compensating for thermal expansion or tooling wear without mechanical modifications.
Select the SCJ250X150-50S when your application demands high force and the flexibility to adjust the stroke end position by up to 50 mm during commissioning or changeovers. If your force requirement is slightly lower, consider stepping down to the 200 mm bore SCJ200 series, which provides 15708 N of push at 0.5 MPa. For applications needing a fixed, non-adjustable stroke, the standard SC series is a more cost-effective alternative. If the load introduces significant side forces, an external guide rod assembly or a guided cylinder is recommended to prevent rod bending and ensure seal longevity.
For a direct replacement, match this cylinder with another AirTAC SCJ adjustable-stroke model of the same 250 mm bore, 150 mm nominal stroke, and 50 mm adjustment range. Ensure the replacement has a PT port thread, a built-in magnet (-S), and the same basic mounting configuration to guarantee dimensional and functional interchangeability.
Adjustable-stroke checklist
At 0.5 MPa operating pressure, this 250 mm bore cylinder generates 24544 N of push force and 23562 N of pull force. The maximum push force at the 0.9 MPa operating limit is 44178 N. The theoretical force at 1.0 MPa is 5006 kgf.
A rear-cap adjusting screw allows you to shorten the stroke end position by up to 50 mm from the 150 mm nominal stroke. This mechanical adjustment sets a new, precise end-stop for the piston's extension, enabling on-machine tuning without altering the cylinder's mounting or porting.
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