The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X250-40 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. Ø63mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X250-40 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston's stop position by up to 40 mm without removing the cylinder from the machine. At 0.5 MPa, it delivers 1559 N of push force and 1402 N on the pull stroke, driven by a 20 mm diameter piston rod and fed through PT1/4 ports.
Its 28 mm air cushion decelerates the piston quietly near end-of-travel, while the rear adjusting screw sets the exact stroke end for commissioning or format changes. The tie-rod body measures 197 mm in length (A dimension), making it a compact, repeatable solution for mid-range force applications where stroke precision matters more than swapping fixed-stroke cylinders.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X250-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M16×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 28 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 | 1559 N | 1402 N |
| 0.7 MPa | 2182 N | — |
| Max (@1.0 MPa) | 318 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. |
|---|---|
| 63 | Bore size in mm. |
| ×250 | 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.
During machine commissioning, the 40 mm adjustment screw lets technicians dial in the exact stop position for a pressing or clamping station without fabricating shims or custom end-stops, saving hours of mechanical setup time.
In abrasive or high-cycle applications, the adjustable stroke end can be periodically advanced to compensate for tooling or pad wear, maintaining consistent contact pressure without replacing the cylinder or adding external adjustments.
When a packaging line switches between product sizes, the SCJ63X250-40 allows operators to quickly reset the pusher stroke for different box lengths, reducing changeover time compared to swapping fixed-stroke cylinders.
Choose this 63 mm bore when your application needs more force than the 40 mm bore's 628 N push at 0.5 MPa but doesn't yet require the 80 mm bore's 2513 N. The 40 mm adjustment range is ideal for processes that need end-position tuning across a 250 mm nominal stroke. If your stroke length is fixed and never changes, a standard SC63X250 may be a simpler, lower-cost alternative.
For replacement, match an AirTAC SCJ63X250-40 with PT ports, basic mounting, and no magnet. At 250 mm stroke, rod buckling is not a primary concern for axial loads, but if the cylinder experiences significant side forces, add an external guide rail or consider a guided cylinder to protect the rod and bearing.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (due to the 20 mm rod reducing the piston area on the return side). At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The theoretical force at 1.0 MPa is 318 kgf.
Yes, if you need the ability to fine-tune the stroke end. The SCJ63X250-40 shares the same bore, port size (PT1/4), and mounting accessories as the SC63 series, but the body is slightly longer to house the adjusting screw. Ensure your machine has clearance for the extra length and that the adjustable range covers your required stroke variation.
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