The AirTAC Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X80-50STC 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, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X80-50STC is a double-acting, single-rod pneumatic cylinder with a 63 mm bore and a nominal 80 mm stroke, equipped with a rear-cap adjusting screw that provides up to 50 mm of stroke-end shortening. This allows machine builders to fine-tune the piston stop position in the field without swapping the cylinder, which is ideal for commissioning trials or format changeovers. The built-in magnet and centre trunnion mount make it ready for sensor feedback and pivoting applications right out of the box.
At 0.5 MPa, this cylinder delivers 1559 N of push force and 1402 N of pull force, with a maximum push of 2805 N at 0.9 MPa. The 20 mm piston rod features an M16x1.5 male thread, and the unit uses PT1/4 ports. Its 28 mm air cushion decelerates the piston quietly at each end, and the body length A(SCJ) is 197 mm.
| Model | Airtac AIRTAC SCJ63 Standard Cylinder SCJ63X80-50STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 80 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. |
| ×80 | 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 adjust range lets technicians dial in the exact stroke end position during machine commissioning, accommodating stack-up tolerances without re-machining brackets or ordering new cylinders.
On packaging or sorting lines, quickly adjust the cylinder stroke to handle different product sizes. The centre trunnion mount allows the cylinder body to swing as it actuates a diverter gate.
In clamping or pressing fixtures, the stroke-end screw can be advanced over time to compensate for tooling wear or material compression, maintaining consistent clamp force without reprogramming a controller.
Choose the SCJ63 when you need the 1.5 kN push class (at 0.5 MPa) and the flexibility of a 50 mm adjustable stroke. If your force requirement is lower, the SCJ50 offers 982 N of push; for a significant step up, the SCJ80 provides 2513 N of push. This SCJ63X80-50STC is specifically configured with a built-in magnet for CMSG/DMSG sensors and a TC centre trunnion mount (supplied with the TCM1 bracket, order code F-SC63TC) for loads that need to pivot.
For a direct replacement, match an AirTAC SCJ cylinder with a 63 mm bore, 80 mm nominal stroke, a 50 mm adjust range, PT1/4 ports, a TC mount, and a magnet. If your application does not require stroke adjustability, a fixed-stroke SC cylinder is a simpler alternative. For strokes at or beyond 300 mm in this bore, evaluate the rod bearing load and consider an external guide or a guided cylinder to prevent rod buckling.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 1559 N and the pull force is 1402 N (the pull force is lower due to the single 20 mm rod area). The maximum push force at the 0.9 MPa operating limit is 2805 N. The theoretical force at 1.0 MPa is 318 kgf.
No, the SCJ63 is a standard double-acting cylinder and will not hold its position if air pressure is exhausted or lost. The adjustable screw only sets the stroke end position and the air cushion only decelerates the piston; neither acts as a lock. To hold a load without live pressure, you must add an external rod brake, a mechanical lock, or a pilot-operated check valve.
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