The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X250-100S 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, 250mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X250-100 is a 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 100 mm of field-adjustable stroke-end reduction, allowing fine-tuning of the piston stop position without removing the cylinder from the machine.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod and PT1 inch ports, with an adjustable air cushion length of 40 mm to decelerate high-inertia loads. 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. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X250-100S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 250 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. |
| ×250 | 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.
Fine-tune the final pressing depth in a large hydraulic-style pneumatic press by adjusting the rear screw, accommodating variations in material thickness or tooling wear without reprogramming the machine.
Quickly adjust the clamping stroke for different-sized workpieces on a heavy-duty welding or assembly fixture, minimizing downtime during batch changes with a simple mechanical adjustment.
Take up mechanical play or seal wear in a foundry moulding line actuator over time by incrementally extending the effective stroke with the adjusting screw, maintaining precise mould alignment.
Choose the SCJ250X250-100 when you need a high-force actuator with the ability to dial in the stroke end position during commissioning or for different product formats. If the 24544 N push force at 0.5 MPa is more than required, stepping down to the 200 mm bore SCJ series provides 15708 N of push force at the same pressure, reducing air consumption and physical size. For applications needing a fixed, non-adjustable stroke, the standard SC250X250 is the correct alternative.
This model is a direct replacement for an existing AirTAC SCJ250X250-100 with PT ports, a basic mount, and a magnet. For this 250 mm stroke, which is well within the bore's 1500 mm maximum standard stroke, ensure the load is guided externally if significant side forces are present, as the cylinder's rod bearings are designed for axial thrust.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 24544 N and the pull force is 23562 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 44178 N. The pull force is lower due to the area of the 50 mm piston rod.
A screw mechanism in the rear cap acts as a movable end-stop for the piston. Turning the screw changes the retracted position of the piston, allowing you to shorten the effective stroke by up to 100 mm from the nominal 250 mm maximum. It is a mechanical stroke limiter, not a force or speed control.
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