The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X550-50S 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, 550mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X550-50S is a double-acting, single-rod pneumatic cylinder that puts stroke-end tuning directly on the machine. Its rear-cap adjusting screw provides a 50 mm field-adjustable range, letting you dial in the exact stop position for a 550 mm nominal stroke without swapping the cylinder or adding external hard stops. At 0.5 MPa, it delivers 1559 N of push force and 1402 N of pull force, driven through a 20 mm diameter piston rod.
This model includes a built-in magnet (-S suffix), so CMSG, DMSG, or EMSG solid-state sensors clamp directly onto the tie-rod barrel for non-contact position sensing. The cylinder uses a PT1/4 port, an M16x1.5 rod thread, and a 28 mm adjustable air cushion to decelerate the piston smoothly. Its body length A(SCJ) is 197 mm, making it a compact choice for a 63 mm bore tie-rod cylinder with a long 550 mm working stroke.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X550-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 550 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. |
| ×550 | 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 adjustment screw lets technicians precisely set the end-of-stroke position for a 550 mm actuator, compensating for stack-up tolerances in welded frames or tooling plates without re-machining mounts.
On a packaging line, the adjustable stroke allows a quick mechanical change to the pusher stroke length when switching between box sizes. The built-in magnet provides clean end-of-stroke signals to the PLC via a DMSG sensor.
In a woodworking clamp station, the screw adjusts the final clamp position to account for pad wear over thousands of cycles, maintaining consistent clamping force without reprogramming the pneumatic circuit.
Step up to an 80 mm bore if your application needs more than 1559 N of push force at 0.5 MPa; the SCJ80 delivers 2513 N. For purely fixed-stroke tasks where field adjustment is never needed, the standard SC63 fixed-stroke cylinder is a simpler, lower-cost alternative. If the 550 mm stroke introduces a risk of side-loading on the 20 mm rod, consider adding an external linear guide or switching to a guided cylinder to protect the rod bearing and seal.
As a direct replacement, match an AirTAC SCJ adjustable-stroke cylinder of the same 63 mm bore, 550 mm nominal stroke, and 50 mm adjustment range (-50). Ensure the port thread is PT, the mounting style is basic, and the magnet option (-S) is present. The SCJ mounting system accepts FA front flange, LB foot, or TC centre trunnion accessories (no FB or CA/CB), ordered with the F-SC63 prefix.
Adjustable-stroke checklist
At 0.5 MPa, push force is 1559 N and pull force is 1402 N. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N. The pull force is lower because the 20 mm piston rod reduces the effective area on the return stroke.
A rear-cap screw sets the stroke end position within a 50 mm range, shortening the 550 mm nominal stroke. It is a mechanical end-stop adjustment, not a locking device. The piston will drift if air pressure is lost; to hold a load without live pressure, you must add an external rod lock or pilot-operated check valve.
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