The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X125-30TC 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, 125mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X125-30TC is a double-acting, single-rod pneumatic cylinder that puts fine stroke-end tuning directly on the machine. Its rear-cap adjusting screw provides up to 30 mm of retraction from the 125 mm nominal stroke, letting you dial in the exact stop position during commissioning or format changes without swapping the cylinder. The 63 mm bore delivers 1559 N of push force at 0.5 MPa, making it a capable mid-range actuator for positioning and pressing tasks.
This model ships with a TC centre trunnion mount and the matching TCM1 bracket, allowing the cylinder to pivot as it strokes—ideal for swinging or articulating loads. The 20 mm piston rod and PT1/4 ports are standard for the 63 mm bore, and the 28 mm air cushion at each end decelerates the piston smoothly. The body length A(SCJ) is 197 mm, slightly longer than a fixed-stroke SC of the same bore to accommodate the adjusting mechanism.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X125-30TC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 125 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. |
| ×125 | 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.
Fine-tune the retracted end position during machine bring-up without removing the cylinder. The 30 mm adjustment range lets technicians quickly dial in the exact stop point for grippers, clamps, or stops.
Adjust the stroke end to accommodate different product sizes on packaging or assembly lines. The rear screw makes it fast to switch between formats without mechanical rework or external hard stops.
Take up mechanical play in linkages or tooling over time by slightly retracting the stroke end. The SCJ63X125-30TC lets you restore precise positioning without replacing wear parts or reprogramming controllers.
Choose the SCJ63X125-30TC when your application needs a 125 mm maximum stroke with the ability to shorten the end position by up to 30 mm in the field. If you need more force, step up to the 80 mm bore, which provides 2513 N of push at 0.5 MPa. For a lighter, more compact solution, the 50 mm bore offers 982 N. If your stroke is fixed and you don't need adjustability, the standard SC63X125 is a simpler, more economical choice. For a direct replacement, match the 63 mm bore, 125 mm nominal stroke, 30 mm adjustment range, PT port thread, and TC centre trunnion mounting.
Adjustable-stroke checklist
At 0.5 MPa, the cylinder generates 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 pull side. At the maximum operating pressure of 0.9 MPa, push force reaches 2805 N.
A screw in the rear cap sets the retracted end position. Turning the screw shortens the stroke by up to 30 mm from the nominal 125 mm. It only adjusts the stroke end stop—it does not change the cylinder's force, speed, or the extended position.
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