The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X185-30 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 mm range without swapping the cylinder. Ø63mm bore, 185mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X185-30 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke shortening. This allows fine-tuning of the end position without swapping the cylinder. With a 63 mm bore, it delivers 1559 N of push force at 0.5 MPa, making it a strong mid-range actuator for tasks like clamping, pressing, or material transfer.
This model has a 20 mm diameter piston rod, PT1/4 ports, and a 28 mm air cushion for smooth deceleration. The body length A(SCJ) is 197 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism. The maximum standard stroke for this bore is 1500 mm, and this 185 mm unit is well within that range.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X185-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 185 mm |
| Stroke adjustment | Up to 30 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. |
| -30 | 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.
The 30 mm adjustment screw lets technicians precisely set the retract stroke end to compensate for tooling wear or slight variations in workpiece thickness, ensuring consistent clamping pressure without reprogramming a controller.
On a packaging line, quickly adjust the stroke to handle different box heights. The operator turns the rear screw to set the new end position for a pusher arm, minimizing downtime between product runs.
During machine setup, engineers can incrementally adjust the cylinder's stroke to find the optimal end point for a new process. Once the ideal position is found, the lock nut is tightened, and the setting is fixed for production.
Choose the SCJ63X185-30 when you need to dial in a precise stroke end during commissioning or for different product runs. If the 1559 N push force at 0.5 MPa is insufficient, stepping up to an 80 mm bore provides 2513 N. If a fixed stroke is acceptable, the standard SC63 is a simpler, more compact alternative. For a direct replacement, match the 63 mm bore, 185 mm nominal stroke, 30 mm adjust range, PT port thread, and basic mounting.
For this 185 mm stroke, side-loading is generally not a primary concern, but always ensure the load is guided and aligned with the rod axis to prevent premature seal and bearing wear. If the application involves significant off-axis forces, consider adding an external guide rail.
Adjustable-stroke checklist
At the standard operating pressure of 0.5 MPa, this cylinder generates 1559 N of push force and 1402 N of pull force. The push force is higher because the full bore area is used, while the pull force is reduced by the area of the 20 mm piston rod.
This is a genuine AirTAC SCJ63X185-30 tie-rod cylinder. It is a direct dimensional and performance replacement for another AirTAC SCJ63X185-30. For cross-brand compatibility, you must verify the bore, 185 mm nominal stroke, 30 mm adjustment range, PT1/4 port, 20 mm rod thread (M16x1.5), and mounting dimensions match your existing unit.
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