The AirTAC Airtac SCJ250 Standard Cylinder SCJ250X160-40S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø250mm bore, 160mm nominal stroke, PT1" ports and adjustable end cushioning.
The SCJ250X160-40S is a large-bore double-acting single-rod cylinder from the AirTAC SCJ adjustable-stroke family, delivering a substantial 24544 N push force at 0.5 MPa (44178 N at the 0.9 MPa maximum operating pressure). Its rear-cap adjusting screw provides a 40 mm stroke-end reduction range, letting you dial in the precise end position for heavy-duty tooling without removing the cylinder.
This ISO 6430 class tie-rod cylinder uses a 50 mm diameter piston rod with an M42x2 thread and features a 40 mm air cushion for smooth deceleration of high-inertia loads. The built-in magnet (denoted by the -S suffix) allows direct mounting of CMSG, DMSG, or EMSG reed and solid-state sensors along the barrel for reliable end-of-stroke detection.
| Model | Airtac SCJ250 Standard Cylinder SCJ250X160-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder (ISO 6430 class) |
| Bore size | Ø250 mm |
| Nominal stroke | 160 mm |
| Stroke adjustment | Up to 40 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. |
| ×160 | Nominal (maximum) stroke length in mm. |
| -40 | 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 hydraulic-style pneumatic press tools, the 40 mm adjust range lets operators fine-tune the final press-fit depth for different component batches without changing tooling, using the cylinder's 44178 N maximum push force.
Used as a pallet stopper in heavy conveyor systems, the stroke end can be adjusted to accommodate different pallet sizes or to compensate for wear on the stopping surface, ensuring consistent positioning.
For large-scale welding fixtures, the adjustable stroke allows the clamp arm's final position to be precisely set during commissioning, accounting for manufacturing tolerances in the welded assembly.
Choose the SCJ250 when your application demands 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. If your stroke does not require field adjustability, the fixed-stroke SC250 is a simpler alternative. For this model, a direct replacement must match the 250 mm bore, 160 mm nominal stroke, 40 mm adjust range, PT port thread, and the -S magnet; the basic mounting configuration uses no additional bracket.
At a 160 mm stroke, rod buckling is generally not a concern for this robust 50 mm rod, but always ensure the load is guided and side forces are minimized. If the cylinder must hold a position without air pressure, an external rod lock or pilot-operated check valve is required, as the air cushion and stroke-adjust screw do not provide any holding function.
Adjustable-stroke checklist
A screw mechanism in the rear cap limits the piston's return stroke. By turning the screw, you can shorten the stroke end by up to 40 mm from the nominal 160 mm maximum. This is a mechanical stroke limiter, not a force or speed control.
At the standard 0.5 MPa operating pressure, the push force is 24544 N and the pull force is 23562 N (reduced due to the 50 mm rod area). The maximum force at 0.9 MPa is 44178 N push and 42412 N pull.
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