The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X185-20 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. Ø63mm bore, 185mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X185-20 brings 1559 N of push force at 0.5 MPa to applications needing on-the-fly stroke trimming. Its rear-cap adjusting screw provides up to 20 mm of stroke-end reduction, letting you dial in the exact stop position without swapping the cylinder or adding external hard stops.
Built on the rugged SC tie-rod platform, this 63 mm bore unit uses a 20 mm piston rod and PT1/4 ports. The 28 mm air cushion at each end decelerates the piston smoothly, and the 197 mm body length (A dimension) keeps the package compact for a 185 mm nominal stroke cylinder.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X185-20 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 185 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, 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. |
| ×185 | 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.
Dial in the exact push-stroke endpoint during machine setup without machining hard stops. The 20 mm screw adjustment lets technicians compensate for stack-up tolerances on the spot.
Quickly adapt the cylinder stroke for different product sizes on a packaging or sorting line. Operators can shorten the stroke end by up to 20 mm in seconds with a simple screw adjustment.
Take up mechanical play or seal wear over time in clamping and pressing fixtures. The adjustable stroke end maintains consistent contact without reprogramming the PLC or changing the cylinder.
Step up to the SCJ80 if you need 2513 N of push force at 0.5 MPa; step down to the SCJ50 for 982 N when space is tighter. This model is the right choice when the machine needs frequent stroke-end tweaks—commissioning trials, format changeovers, or wear take-up—that a fixed-stroke SC cannot provide. For a direct replacement, match an AirTAC SCJ63 with a 185 mm nominal stroke, 20 mm adjust range, PT thread, and basic mounting. At this stroke length, avoid off-centre loads or use an external guide to protect the rod from bending.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder delivers 1559 N pushing and 1402 N pulling. At the maximum 0.9 MPa, push force reaches 2805 N. The pull force is lower because the 20 mm rod reduces the effective piston area on the return stroke.
Yes, if you need field-adjustable stroke end control. The SCJ63X185-20 shares the same bore, rod, port, and mounting interfaces as the SC series. Just ensure your application can accommodate the slightly longer rear cap that houses the adjusting screw.
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