The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-40STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 40 mm range without swapping the cylinder. Ø63mm bore, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X50-40STC is a double-acting, single-rod pneumatic cylinder with a 40 mm rear stroke-adjustment screw, letting you fine-tune the end position on the fly without swapping the unit. With a 63 mm bore and 20 mm rod, it delivers 1559 N of push force at 0.5 MPa, making it a robust choice for clamping, pressing, or ejector stations where the stroke must be dialled in precisely during commissioning or format changes.
This model comes factory-equipped with a built-in magnet (-S) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion mount (TC) supplied with the TCM1 bracket (order code F-SC63TC) for pivoting applications. The body length A(SCJ) is 197 mm, and the adjustable air cushion decelerates the piston smoothly over the final 28 mm of travel.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-40STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 50 mm |
| Stroke adjustment | Up to 40 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. |
| ×50 | Nominal (maximum) stroke length in mm. |
| -40 | 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.
Engineers can micro-adjust the stroke end by up to 40 mm during initial machine runoff, eliminating the need to stock multiple fixed-stroke cylinders for trial-and-error positioning of stops or tooling.
On packaging lines handling different box heights, the rear screw allows operators to quickly reset the pusher stroke without tools, minimizing downtime between batches.
In high-cycle clamping fixtures, the adjustable stroke can be extended slightly over time to compensate for pad wear, maintaining consistent clamping force without replacing the cylinder.
Choose this SCJ63 when you need more force than the 40 mm bore (628 N push) but a smaller footprint than the 80 mm bore (2513 N push). The 40 mm adjustment range is ideal for processes that require frequent end-stop changes. If your application demands a fixed, non-adjustable stroke, the standard SC63 is a simpler alternative. For side-loads on strokes of 300 mm or more, add an external guide rail to prevent rod bending.
As a direct replacement, match the 63 mm bore, 50 mm nominal stroke, 40 mm adjust range, PT port thread, TC trunnion mount, and the integrated magnet. This ensures drop-in compatibility with your existing AirTAC SCJ setup.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The maximum push force at the 0.9 MPa operating limit is 2805 N. Because it is a single-rod cylinder, the push force is greater than the pull force due to the area of the 20 mm rod.
No. The SCJ63 is a double-acting cylinder and does not lock or hold its position when air pressure is exhausted or the valve is centered. The piston will drift or drop under load. You must add a pilot-operated check valve or an external mechanical rod brake if load holding is a safety requirement.
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