The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-40 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X400-40 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 40 mm of field-adjustable stroke reduction. This allows engineers to precisely dial in the stroke end position without changing the cylinder or adding external hard stops. At 0.5 MPa, it delivers 1559 N of push force and 1402 N of pull force, making it a strong mid-range actuator for applications requiring both power and fine positional tuning.
The 63 mm bore features a 20 mm piston rod, PT1/4 ports, and an M16x1.5 rod thread for straightforward mounting. Its 28 mm air cushion decelerates the piston smoothly at both ends, protecting the end caps during high-cycle operation. With a body length A of 197 mm, this tie-rod cylinder is built for reliable service in automated machinery where stroke adjustment simplifies commissioning and format changeovers.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-40 |
|---|---|
| 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 adjustment range lets technicians fine-tune the stroke end position during machine commissioning without swapping cylinders, saving hours of mechanical rework on packaging or assembly lines.
On conveyor diverters or product pushers handling different box sizes, the rear screw quickly adapts the stroke to a new format, reducing downtime between production runs.
In clamping or pressing fixtures, the adjustable stroke can be extended slightly over time to compensate for tooling or pad wear, maintaining consistent clamping force without replacing the cylinder.
Step up to the 80 mm bore if your application demands more than the SCJ63's 1559 N push force at 0.5 MPa; the SCJ80 provides 2513 N. If your load is lighter and space is tight, the 50 mm bore offers 982 N. For applications where the stroke is fixed after initial setup, a standard SC63X400 cylinder eliminates the adjusting screw. This SCJ63X400-40 is the direct replacement for an existing AirTAC SCJ63X400-40 with PT ports and basic mounting. For strokes of 300 mm or more, evaluate side-loading on the 20 mm rod; if the load is not guided externally, consider adding a guide rod or switching to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The maximum push force at 0.9 MPa is 2805 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the area of the 20 mm rod.
Yes, if you need the ability to adjust the stroke end. The SCJ63X400-40 has the same bore, nominal stroke, port size, and mounting footprint as an SC63X400, but adds a rear adjusting screw with a 40 mm range. Ensure your machine has clearance for the slightly longer body length A of 197 mm.
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