The AirTAC Airtac SCJ50 Standard Cylinder SCJ50X400-20 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø50mm bore, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ50X400-20 is a 50 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that provides a 20 mm field-adjustable stroke-end range, letting you dial in the exact stop position without swapping the cylinder. At 0.5 MPa it delivers 982 N push and 825 N pull, moving a 20 mm diameter rod through a 400 mm nominal stroke.
This tie-rod cylinder uses PT1/4 ports and an M16x1.5 rod thread, with a 21 mm air cushion at each end for smooth deceleration. The SCJ body length A is 194 mm plus stroke, making it slightly longer than the fixed-stroke SC equivalent. Operating pressure spans 0.15–1.0 MPa, with speed from 30–800 mm/s.
| Model | Airtac SCJ50 Standard Cylinder SCJ50X400-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø50 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 20 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, 21 mm |
| Max stroke | Up to 1200 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 | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 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. |
|---|---|
| 50 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -20 | 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 20 mm screw adjustment lets technicians dial in the exact extend stop for a clamp or pusher without iterative cylinder swaps, cutting commissioning time on a 400 mm stroke station.
When a packaging line switches product sizes, the adjustable stroke end quickly repositions a 400 mm stroke diverter gate. Operators turn the rear screw to match the new box width in minutes.
As press tooling or gripper pads wear over thousands of cycles, the 20 mm adjustment range compensates for the lost travel, maintaining consistent contact force without replacing the cylinder or adding shims.
Choose this 50 mm bore when the 40 mm bore’s 628 N push at 0.5 MPa is marginal and the 63 mm bore’s 1559 N is overkill for your fixture. The 20 mm adjustment range suits commissioning fine-tuning or format changeovers where the end position shifts by a few millimetres. If your stroke is fixed and you never need field adjustment, a standard SC50X400 saves cost and length.
For a 400 mm stroke, rod buckling and side-load become real concerns. Mount the load rigidly guided along the rod axis, or add an external guide rail. If the application involves frequent side forces, consider a guided cylinder instead. Direct replacement matches an AirTAC SCJ of identical bore, 400 mm nominal stroke, -20 adjust range, PT thread, and basic mounting.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this 50 mm bore cylinder produces 982 N pushing force and 825 N pulling force. At the maximum 0.9 MPa, push force reaches 1767 N. The push force is higher than pull because the rod reduces the piston area on the return side.
Yes, the SCJ shares the same mounting footprint and port locations as the SC of the same bore. The SCJ body is slightly longer due to the adjusting mechanism. Ensure your machine has clearance for the rear screw housing and that you need the 20 mm stroke-end adjustment range.
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