The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-40S 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 SCJ63X50-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, providing 1559 N of push force at 0.5 MPa. Its rear-cap adjusting screw allows the effective stroke to be shortened by up to 40 mm from the nominal 50 mm maximum, making it invaluable for fine-tuning end positions during commissioning or format changes without replacing the cylinder. The 20 mm rod and 28 mm air cushion ensure robust, decelerated end-of-stroke performance.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for precise, non-contact position feedback. The standard TPU seal operates from -20 to +70 °C with PT ports. The body length A(SCJ) is 197 mm, and it delivers up to 2805 N of push force at the maximum operating pressure of 0.9 MPa.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X50-40S |
|---|---|
| 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.
Speed up machine commissioning by fine-tuning the cylinder's end-stop position on the fly. The 40 mm adjust range allows engineers to dial in the exact stroke needed without swapping cylinders or machining external hard stops.
Quickly adapt a packaging or sorting line to a new product size. The adjustable stroke lets operators change the pusher or stopper cylinder's travel in minutes, minimizing downtime during batch changes.
In clamping or pressing fixtures, use the stroke adjustment screw to take up mechanical wear on tooling or contact surfaces over time, maintaining consistent clamping force and position without replacing parts.
Choose the SCJ63 bore for applications needing 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 40 mm stroke adjustment range is ideal for processes requiring frequent end-stop tweaks. If your application does not require stroke adjustability, a fixed-stroke SC63 cylinder is a simpler, more cost-effective alternative. For guided loads, pair this with an external guide or consider a guided cylinder.
A direct replacement must match the 63 mm bore, 50 mm nominal stroke, 40 mm adjustment range, PT port thread, and the built-in magnet. This SCJ cylinder uses the basic mounting style; for a pivoting mount, select the TC centre trunnion (F-SC63TC) with a TCM1 bracket. Note that the single-rod design means pull force is lower (1402 N at 0.5 MPa) due to the rod area.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N. The force increases with pressure, reaching a maximum push force of 2805 N at the 0.9 MPa operating limit. The pull force is lower because the 20 mm piston rod reduces the effective piston area on the return stroke.
A rear-cap screw sets the stroke end position, shortening the nominal 50 mm stroke by up to 40 mm. It is a direct dimensional match for an SC63 fixed-stroke cylinder of the same bore and nominal stroke, but adds field adjustability. Ensure your replacement matches the port thread (PT), magnet option (S), and mounting style.
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