The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X25-20TC 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, 25mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X25-20TC is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end tuning directly on the machine. A rear-cap adjusting screw lets you shorten the stroke by up to 20 mm without removing the cylinder or adding external hard stops, which is ideal for commissioning trials and format changeovers. The 63 mm bore generates 1559 N of push force at 0.5 MPa and 2805 N at the maximum 0.9 MPa operating pressure.
This model ships with a centre trunnion (TC) mount, allowing the cylinder to pivot as it strokes—perfect for swinging or articulating loads. The trunnion bracket (TCM1) is included, and the complete assembly is ordered under the part code F-SC63TC. With a 20 mm piston rod, PT1/4 ports, and a 28 mm air cushion, it delivers controlled deceleration in a compact tie-rod body that is slightly longer than the fixed-stroke SC version.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X25-20TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 25 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. |
| ×25 | 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.
Fine-tune the end-of-stroke position during initial machine setup. The 20 mm adjustment range lets technicians dial in the exact stopping point for grippers, clamps, or pushers without re-plumbing or swapping cylinders.
Quickly adapt to different product sizes on packaging or assembly lines. The rear screw adjusts the stroke end in seconds, allowing a single cylinder to handle multiple formats where the stroke length varies by up to 20 mm.
Compensate for mechanical wear in linkages, tooling, or seals over time. As components bed in, the adjustable stroke screw can be turned to restore the original stopping position without replacing the cylinder or adding shims.
Choose the 63 mm bore when your application needs a push force between the 40 mm bore (628 N at 0.5 MPa) and the 80 mm bore (2513 N at 0.5 MPa). The SCJ63X25-20TC is the right pick when you need a pivoting motion from the centre trunnion; if the load is guided and does not pivot, a basic or foot-mounted SCJ63 would be simpler. For a direct replacement, match the 63 mm bore, 25 mm nominal stroke, 20 mm adjustment range, PT port thread, and TC mount with the F-SC63TC bracket. If your stroke is fixed and never needs field adjustment, the standard SC63 is a more economical choice.
Adjustable-stroke checklist
At 0.5 MPa, this 63 mm bore cylinder delivers 1559 N of push force and 1402 N of pull force. The push force is higher because the single rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N.
Yes, provided the mounting and porting match. The SCJ63 body is slightly longer than a fixed-stroke SC63 of the same nominal stroke to house the adjusting screw. You must also account for the 20 mm adjustment range: the SCJ63X25-20TC can have its stroke shortened from 25 mm down to 5 mm, so ensure your machine layout can accept the longer body and the reduced minimum stroke.
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