The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-50 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 SCJ63X400-50 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly into the rear cap. A 50 mm adjusting screw lets you shorten the 400 mm nominal stroke in the field, so you can dial in the exact end position during commissioning, format changeovers, or wear take-up without swapping the cylinder or adding external hard stops. The 20 mm diameter piston rod and 28 mm air cushion work together to deliver controlled deceleration across the full adjustable range.
At 0.5 MPa air pressure, this 63 mm bore cylinder generates 1559 N of push force and 1402 N on the pull stroke, matching the force profile of a fixed-stroke SC of the same size. The body length A(SCJ) is 197 mm plus stroke, and the standard PT1/4 ports keep plumbing straightforward. Operating pressure spans 0.15–1.0 MPa, with a proof pressure of 1.5 MPa, making it a robust choice for general industrial automation where stroke flexibility is required.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X400-50 |
|---|---|
| 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.
During machine bring-up, the 50 mm rear adjuster lets technicians tweak the end stop precisely without remounting the cylinder, speeding up alignment of clamps, stops, or ejectors on a 400 mm stroke.
On packaging or assembly lines that run multiple product sizes, operators can quickly reset the stroke end for different box heights or part lengths, reducing downtime between batches.
In high-cycle pressing or clamping stations, the screw can be advanced slightly over time to compensate for pad or tooling wear, maintaining consistent contact without reprogramming the machine.
Choose the SCJ63X400-50 when your application needs a 400 mm reach with the ability to trim the stroke end by up to 50 mm on the machine. If 1559 N of push force at 0.5 MPa is more than you need, stepping down to the 50 mm bore (982 N push) saves air and space; if you need more force, the 80 mm bore delivers 2513 N push. For applications that do not require stroke adjustment, the fixed-stroke SC63X400 is a simpler, slightly shorter alternative.
At 400 mm of stroke, rod deflection under side load becomes a real concern. If the load is not guided externally, consider adding an external guide rail or switching to a guided cylinder to protect the rod bearing and seal. For direct replacement, match the SCJ63 bore, 400 mm nominal stroke, 50 mm adjust range, PT1/4 ports, and your chosen mounting accessory. The SCJ mounting subset includes FA front flange (F-SC63FA), LB foot mount (F-SC63LB), and TC centre trunnion with TCM1 bracket (F-SC63TC).
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 0.9 MPa, push force reaches 2805 N. The theoretical force at 1.0 MPa is 318 kgf, but the cylinder should not be operated continuously at that pressure.
Yes, if your existing cylinder is an AirTAC SCJ63 with a 400 mm nominal stroke and a 50 mm adjustable range. Confirm that the port thread (PT1/4), mounting style (basic, FA, LB, or TC), and magnet option match your current setup. The SCJ is a tie-rod cylinder and is not dimensionally interchangeable with ISO 15552 cylinders.
Genuine AirTAC parts produced by AirTAC factory.
Covers non-human-caused product damage.
Standard models usually ship in 3-4 days.
Most inquiries answered within 7-8 hours.
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.