The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-40S 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X400-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the 400 mm nominal stroke by up to 40 mm without swapping the unit. Its 63 mm bore delivers 1559 N of push force at 0.5 MPa and 2805 N at the maximum 0.9 MPa operating pressure, driven by a 20 mm diameter piston rod.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG solid-state and reed sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The cylinder uses PT1/4 ports, an M16x1.5 rod thread, and a 28 mm adjustable air cushion to decelerate the piston smoothly. The body length A(SCJ) is 197 mm, making it a compact solution for medium-force, adjustable-position tasks.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 400 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. |
| ×400 | 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.
The 40 mm rear adjuster lets technicians precisely set the retract stroke end for a new machine during initial setup, eliminating the need to machine custom stops.
In high-cycle clamping fixtures, the stroke can be periodically lengthened by a few millimeters to compensate for jaw or pad wear, maintaining consistent clamping force.
On a packaging line, the adjustable stroke allows operators to quickly reposition a diverter gate's travel limit for different box sizes without mechanical adjustments.
Choose the SCJ63X400-40S when you need to dial in a stroke end position during commissioning or format changes without adding external hard stops. If 1559 N of push force at 0.5 MPa is insufficient, stepping up to an 80 mm bore provides 2513 N; if it is more than you need, a 50 mm bore delivers 982 N. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a simpler alternative.
At a 400 mm stroke, be mindful of side loads that can cause rod bending. Use an external linear guide or consider a guided cylinder if the load is not perfectly axial. This cylinder is a direct replacement for another AirTAC SCJ63X400-40S with PT ports, a basic mount, and a magnet. Mounting accessories from the SCJ subset, such as the FA front flange (F-SC63FA) or LB foot mount (F-SC63LB), can be added.
Adjustable-stroke checklist
At 0.5 MPa, it delivers 1559 N of push force and 1402 N of pull force. At the maximum operating pressure of 0.9 MPa, the push force increases to 2805 N. The pull force is always lower because the rod reduces the effective piston area on the return stroke.
Yes, this is a genuine AirTAC SCJ63X400-40S with a 40 mm adjustable stroke, a built-in magnet, PT ports, and a basic mount. It is a direct dimensional and functional match for any cylinder with the same exact ordering code.
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