The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X150-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø250mm bore, 150mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X150-100 is a double-acting, single-rod pneumatic cylinder from AirTAC, 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 push force of 24544 N at 0.5 MPa, rising to 44178 N at the maximum operating pressure of 0.9 MPa. The key differentiator is the rear-cap adjusting screw, which provides up to 100 mm of stroke-end reduction, allowing operators to fine-tune the cylinder's travel from its nominal 150 mm maximum without replacing the unit or adding external hard stops.
This tie-rod cylinder is built to the ISO 6430 standard for large bores, ensuring robust and reliable performance in demanding industrial environments. The standard PT 1-inch ports supply filtered air, and the integrated variable air cushion, with a 40 mm length, decelerates the piston smoothly at the end of its stroke. The body length A(SCJ) is 409 mm, reflecting the space needed for the adjustable mechanism. This specific model comes in a basic mounting configuration with TPU seals and PT threads, ready for direct integration where a flexible stroke end is critical.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X150-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 150 mm |
| Stroke adjustment | Up to 100 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. |
| -100 | 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.
In large hydraulic-style pneumatic presses, the 100 mm adjustment range allows operators to precisely set the final pressing depth for different material thicknesses without changing tooling, leveraging the cylinder's 44178 N max push force.
Fine-tune the push-off stroke for different pallet sizes on a heavy-duty palletizer. The adjustable stroke compensates for mechanical wear and pallet build variations, maintaining consistent layer placement.
Precisely set the open/close limit for a large industrial gate or butterfly valve. The 100 mm adjustment range allows for perfect alignment with the valve's seat, preventing over-travel and extending valve life.
Select the SCJ250X150-100 when your application demands a high-force actuator with the ability to fine-tune the stroke end position on the fly, such as during commissioning or for format changeovers on large machinery. If your force requirements are slightly lower, stepping down to a 200 mm bore reduces the push force to 15708 N at 0.5 MPa, offering a more compact and cost-effective solution. For applications where the stroke is fixed and never needs adjustment, the standard SC250 cylinder provides the same force output in a slightly shorter body. A direct replacement must match the 250 mm bore, 150 mm nominal stroke, 100 mm adjust range, PT port thread, and basic mounting to ensure full mechanical and pneumatic compatibility.
For this 150 mm stroke, the rod's buckling resistance is generally sufficient for axial loads, but any significant side loading must be managed. If the application involves a non-axial load, an external linear guide or a guided cylinder is essential to prevent premature rod bearing wear and seal failure, ensuring long service life.
Adjustable-stroke checklist
The theoretical push force at the maximum operating pressure of 1.0 MPa is 5006 kgf (49078 N). At the standard 0.5 MPa pressure, the push force is 24544 N. The pull force is lower at 23562 N due to the 50 mm piston rod reducing the effective area on the return stroke.
A screw mechanism in the rear cap acts as an internal, adjustable end-stop for the piston. By turning this screw, you can shorten the cylinder's stroke by up to 100 mm from its nominal 150 mm maximum. This allows for on-machine fine-tuning of the stroke end position without disassembling the cylinder or adding external stops.
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