The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-50S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X400-50S is a 63 mm bore double-acting single-rod pneumatic cylinder with a field-adjustable stroke end, delivering 1559 N of push force at 0.5 MPa. A rear-cap adjusting screw lets you shorten the stroke end by up to 50 mm without removing the cylinder, making it ideal for commissioning trials, format changeovers, or taking up mechanical wear on the line.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG reed and solid-state sensors can be clamped directly onto the tie-rod barrel for reliable end-of-stroke detection. The 20 mm diameter piston rod, PT1/4 ports, and 28 mm air cushion provide smooth deceleration across the full 400 mm nominal stroke, while the tie-rod body length A measures 197 mm plus stroke.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 50 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. |
| -50 | 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 position during machine commissioning without swapping cylinders. The 50 mm adjustment range lets technicians dial in the exact stroke needed for a new fixture or tool.
Quickly adapt the stroke for different product sizes on packaging or assembly lines. Operators can adjust the rear screw to match a new box height or component width in minutes.
Take up mechanical play or seal wear over time by slightly extending the effective stroke. This keeps the actuator hitting its target stop without replacing the entire cylinder.
Step up to an 80 mm bore SCJ if you need more force—the SCJ80 delivers 2513 N push at 0.5 MPa. For applications that do not require field adjustment of the stroke end, the fixed-stroke SC63X400 is a simpler, more cost-effective alternative. When replacing an existing unit, match the 63 mm bore, 400 mm nominal stroke, 50 mm adjustment range, PT port thread, basic mounting, and the -S magnet option.
With a 400 mm stroke, be mindful of side loads that can cause rod bending or premature bearing wear. If the load is not guided externally, consider adding a guide rod assembly or switching to a guided cylinder to protect the piston rod and seals.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 3118 N. The pull force is lower because the piston rod reduces the effective area on the return stroke.
No. Like all standard pneumatic cylinders, the SCJ63X400-50S will drift or drop if air pressure is lost or the directional valve is centered. The air cushion only decelerates the piston, and the adjusting screw only sets the stroke end position—neither acts as a lock. You must add an external rod brake, mechanical lock, or pilot-operated check valve if load holding is required without live pressure.
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