The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-50STC is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø63mm bore, 75mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X75-50STC is a 63 mm bore double-acting single-rod cylinder with a field-adjustable stroke end, giving you a 50 mm adjustment range on the nominal 75 mm stroke. Its rear-cap screw lets you fine-tune the retract end position without swapping the cylinder or adding external hard stops—ideal for commissioning trials and format changeovers. At 0.5 MPa it delivers 1559 N push and 1402 N pull, with a 20 mm diameter piston rod and PT1/4 ports.
This model comes factory-equipped with a built-in magnet (S suffix) for direct mounting of CMSG/DMSG/EMSG sensors, and a centre trunnion pivot (TC suffix) supplied with the TCM1 bracket (order code F-SC63TC) for applications where the cylinder body must swing. The body length A(SCJ) is 197 mm, and the standard TPU seals suit operating temperatures from -20 to +70 °C.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X75-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 75 mm |
| Stroke adjustment | Up to 50 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. |
| ×75 | Nominal (maximum) stroke length in mm. |
| -50 | 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 50 mm rear adjustment screw allows technicians to dial in the exact retract stop position during machine commissioning without swapping shims or hard stops, cutting setup time.
On packaging or sorting lines, operators can quickly adjust the stroke end to accommodate different product sizes, eliminating the need to stock multiple fixed-stroke cylinders.
In clamping or pressing fixtures, the adjustable stroke can be periodically tweaked to compensate for tooling or pad wear, maintaining consistent clamp force without replacing the actuator.
Choose the SCJ63 when your application needs push force around 1559 N at 0.5 MPa. If you require more force, step up to the 80 mm bore SCJ80 which provides 2513 N push at the same pressure; if you need less, the 50 mm bore SCJ50 delivers 982 N. The 50 mm adjustment range on this model makes it a strong candidate for processes where the stroke end must be dialled in precisely after installation. For fixed-stroke applications without adjustment, the standard SC63 cylinder is a simpler alternative.
To replace this unit, match a genuine AirTAC SCJ63 with 75 mm nominal stroke, a 50 mm adjust range, PT ports, centre trunnion (TC) mounting, and a built-in magnet. At 75 mm stroke, rod bending from side loads is minimal, but if your load is not guided, consider adding an external linear guide or switching to a guided cylinder to protect the rod and bearing.
Adjustable-stroke checklist
At 0.5 MPa air pressure, this 63 mm bore 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 return stroke. Maximum push force at 0.9 MPa is 2805 N.
Yes, provided the fixed-stroke SC63 you are replacing has a stroke within the adjustable range of this model. The SCJ63X75-50 has a nominal 75 mm stroke adjustable down by 50 mm, so it can cover any fixed stroke between 25 mm and 75 mm. Ensure your mounting matches the TC centre trunnion style and that you use the magnet if your existing setup has sensors.
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