The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X128-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø63mm bore, 128mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X128-30 is a double-acting, single-rod tie-rod cylinder that puts fine stroke-end tuning directly on the machine. Its rear-cap adjusting screw gives you up to 30 mm of field-adjustable range, so the effective stroke can be dialled back from the 128 mm nominal maximum without swapping the cylinder or adding external hard stops. The 20 mm piston rod and PT1/4 ports deliver a push force of 1559 N at 0.5 MPa, rising to 2805 N at the 0.9 MPa maximum operating pressure.
This 63 mm bore unit shares the same force profile as the fixed-stroke SC series but adds commissioning flexibility. The built-in variable air cushion (28 mm length) decelerates the piston smoothly, and the body length A(SCJ) of 197 mm keeps the envelope compact. It is a practical choice when a process needs stroke tweaking for format changes, wear take-up, or fine end-position alignment, all without disturbing the main mounting.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X128-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 128 mm |
| Stroke adjustment | Up to 30 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. |
| ×128 | Nominal (maximum) stroke length in mm. |
| -30 | 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 bring-up, the 30 mm rear screw lets technicians dial in the exact stroke end for part contact, clamp closure, or ejector depth without iterative cylinder swaps or shimming.
On packaging or assembly lines running multiple product sizes, the adjustable stroke allows a single cylinder to handle different push or stop positions by simply turning the rear screw between batches.
As tooling, gripper pads, or sealing faces wear over time, the stroke-end screw can be advanced to restore the original contact position, extending maintenance intervals and reducing downtime.
Step up to an 80 mm bore (2513 N push at 0.5 MPa) if the 63 mm frame’s 1559 N push is marginal for your moving mass, or down to 50 mm (982 N) to save space and air when force is ample. Choose a fixed-stroke SC63 cylinder if your stroke never needs field adjustment, or a guided SCT series when side loads are present. For a direct replacement, match an AirTAC SCJ63 cylinder with a 128 mm nominal stroke, 30 mm adjust range, PT ports, and the same basic mounting style. If the application requires position sensing, specify the -S magnet option so CMSG/DMSG sensors can be fitted.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, push force is 1559 N and pull force is 1402 N (the pull force is lower because the 20 mm rod reduces the effective piston area on the return stroke). At the maximum 0.9 MPa, push force reaches 2805 N. The adjusting screw does not alter the force output; it only sets the stroke end position within the 30 mm range.
Yes, provided the mounting, port thread, and magnet option match. The SCJ body is slightly longer than the equivalent SC to house the adjusting screw, so verify clearance. The adjustable stroke is a field-set feature—you can lock it at any position within the 30 mm range, effectively giving you a fixed stroke when needed.
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