The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X300-30 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, 300mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X300-30 is a double-acting, single-rod pneumatic cylinder with a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. This allows fine-tuning of the piston stop position without removing the cylinder or adding external hard stops, making it ideal for applications requiring precise end-position setup during commissioning or format changes. With a 63 mm bore, it delivers a push force of 1559 N at 0.5 MPa and 2805 N at the maximum operating pressure of 0.9 MPa.
The cylinder features a 20 mm diameter piston rod with an M16x1.5 male thread and PT1/4 pneumatic ports. Its tie-rod construction provides a robust, serviceable design. The adjustable air cushion, with a 28 mm cushion length, decelerates the piston smoothly at the end of its travel. The body length A for this SCJ series is 197 mm, making it slightly longer than a fixed-stroke SC of the same bore.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X300-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 300 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. |
| ×300 | 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 adjustable stroke allows integrators to precisely dial in the end-of-stroke position during machine commissioning, compensating for mechanical stack-up tolerances without needing custom spacer blocks.
In packaging or sorting lines, operators can quickly re-set the cylinder's stop position for different product sizes. The rear screw adjustment is faster and more repeatable than loosening and re-tightening external mechanical stops.
On clamping or pressing fixtures, the stroke can be slightly extended over time to compensate for wear on tooling or contact surfaces, maintaining consistent clamping force without replacing the actuator.
Select the SCJ63X300-30 when you need a robust 63 mm bore cylinder with the flexibility to adjust the stroke end by up to 30 mm in the field. If the application requires a higher force, consider stepping up to the 80 mm bore (2513 N push at 0.5 MPa). For a lower force profile, the 50 mm bore offers 982 N. If the stroke must be fixed and non-adjustable, the standard SC63X300 is a direct dimensional match. For applications with significant side loads on the 300 mm stroke, an external guide rail or a guided cylinder is strongly recommended to prevent rod bending and premature seal wear. A genuine AirTAC replacement must match the SCJ series, 63 mm bore, 300 mm nominal stroke, 30 mm adjust range, and PT port thread.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, the push force is 1559 N and the pull force is 1402 N. At the maximum operating pressure of 0.9 MPa, the push force increases to 2805 N. The push force is always greater due to the single-rod design, where pressure acts on the full bore area during extension.
Yes, the SCJ63X300-30 is dimensionally compatible with the SC series for the same bore and stroke, but the body is slightly longer to accommodate the adjusting screw. Ensure the extra length fits your machine envelope. The port size (PT1/4), rod thread (M16x1.5), and mounting accessories are identical, making it a direct functional upgrade when adjustability is needed.
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.