The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X300-40S 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. Ø63mm bore, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X300-40S is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a 300 mm nominal stroke, featuring a rear-cap adjusting screw that gives you up to 40 mm of field-adjustable stroke-end control. This model delivers 1559 N of push force at 0.5 MPa and is equipped with a built-in magnet, making it ready for direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel.
With a 20 mm piston rod, PT1/4 ports, and a 28 mm air cushion, the SCJ63X300-40S provides smooth, decelerated end-of-stroke motion that you can fine-tune on the machine. The adjustable stroke is ideal for commissioning trials, format changeovers, or taking up mechanical wear without swapping the cylinder. Its body length A(SCJ) is 197 mm, and it operates reliably between -20 and +70 °C with filtered air.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X300-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 300 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. |
| ×300 | 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.
Fine-tune the end-stop position during machine commissioning without removing the cylinder. The 40 mm adjustment range lets technicians dial in the exact stroke needed for a new fixture or tool.
Quickly adapt a packaging machine's pusher stroke for different box sizes. The rear screw adjusts the stroke end, eliminating the need for mechanical hard stops or cylinder swaps between product runs.
Take up mechanical play in a clamping or pressing station over time. The adjustable stroke compensates for worn tooling or seals, maintaining consistent contact pressure without reprogramming the PLC.
Choose the SCJ63X300-40S when you need a mid-range force actuator with the flexibility to adjust the stroke end position on the fly. If your application requires more force, stepping up to the 80 mm bore SCJ80 series provides 2513 N of push at 0.5 MPa. For a simpler, fixed-stroke solution without the rear adjustment mechanism, the standard SC63X300 is a direct alternative.
For replacement, match this model exactly with an AirTAC SCJ63X300-40S, which includes the -S magnet option, PT port threads, and basic mounting. At a 300 mm stroke, be mindful of side-loading on the 20 mm rod; if the load is not perfectly guided, consider adding an external guide rail or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The push force is higher because the single rod reduces the piston area on the return side. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 318 kgf.
You can, but you will lose the field-adjustable stroke feature. The SC63X300 provides the same bore, stroke, and force, but its stroke is fixed. If you need to retain the ability to fine-tune the stroke end position, you must replace it with another SCJ63X300-40S adjustable-stroke cylinder.
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