The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X175-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø250mm bore, 175mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X175-20S is a heavy-duty double-acting single-rod cylinder delivering 24544 N of push force at 0.5 MPa, built for applications where the stroke end must be fine-tuned on the machine. Its rear-cap adjusting screw provides a 20 mm adjustable range, letting you dial in the exact stop position without swapping the cylinder or adding external hard stops.
This model includes a built-in magnet (S suffix), so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. With a 50 mm piston rod, 40 mm air cushion, and a body length A of 409 mm, it is an ISO 6430 class cylinder suited to large-scale pressing, clamping, and positioning tasks.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X175-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 175 mm |
| Stroke adjustment | Up to 20 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. |
| ×175 | Nominal (maximum) stroke length in mm. |
| -20 | 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.
The 20 mm rear adjustment screw lets operators compensate for tooling wear or material thickness changes on large forming presses without disassembling the machine, maintaining consistent part quality.
Adjust the stroke end position in minutes when switching product sizes on palletisers or large diverters, eliminating the need to stock multiple fixed-stroke cylinders for each format.
During setup of heavy welding or assembly fixtures, the adjustable stroke lets technicians dial in the exact clamp depth iteratively, achieving precise positioning with 24544 N of clamping force.
Choose the SCJ250 when your application demands the 24544 N push force class at 0.5 MPa. If you need a more compact unit and can accept lower force, step down to the 200 mm bore which provides 15708 N push. For fixed-stroke applications where field adjustment is unnecessary, the standard SC250 is a simpler alternative. A direct replacement must match the 250 mm bore, 175 mm nominal stroke, 20 mm adjust range, PT port thread, and the -S magnet option.
At this 175 mm stroke, rod buckling is rarely a concern for the 50 mm rod, but if the load applies significant side force, pair the cylinder with an external guide rail or consider a guided cylinder to protect the rod bearings and ensure smooth operation.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the cylinder provides 24544 N of push force (using the full 250 mm bore area) and 23562 N of pull force (accounting for the 50 mm rod area). The maximum push force at 0.9 MPa is 44178 N.
A fixed-stroke SC250 will fit the same mounting and port connections, but you will lose the 20 mm field-adjustable stroke end feature. If your process requires periodic fine-tuning of the stop position, you must replace it with another SCJ250X175-20S adjustable-stroke cylinder to retain that capability.
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