The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X175-50S 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, 175mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X175-50S delivers a robust 1559 N of push force at 0.5 MPa, making it a solid choice for mid-range automation tasks that demand field-tunable stroke length. Its rear-cap adjusting screw provides a full 50 mm of stroke-end adjustment, letting you dial in the exact stopping position without swapping the cylinder or adding external hard stops.
This 63 mm bore model uses a 20 mm diameter piston rod and PT1/4 ports, with an adjustable air cushion that absorbs 28 mm of travel at each end for smooth deceleration. The built-in magnet (denoted by the -S suffix) allows CMSG, DMSG, or EMSG sensors to clamp directly onto the tie-rod barrel for reliable, non-contact position sensing.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X175-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 175 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. |
| ×175 | 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 adjustment range lets technicians fine-tune the actuator's end-stop during machine commissioning, perfectly aligning the stroke with tooling or fixtures without mechanical rework.
On packaging or sorting lines, quickly re-adjust the cylinder's stroke end to accommodate different product sizes or box dimensions, minimizing downtime between production runs.
In clamping or pressing operations, the adjustable stroke can be periodically tweaked to compensate for gradual wear on gripper pads or tooling surfaces, maintaining consistent clamping force.
Step up to the SCJ80 series if your application requires more force; the 80 mm bore provides 2513 N of push at the same 0.5 MPa pressure. If your stroke length is fixed and never needs field adjustment, the standard SC63 fixed-stroke cylinder offers a simpler, more cost-effective solution. For a direct replacement, match this model's 63 mm bore, 175 mm nominal stroke, 50 mm adjust range, PT ports, basic mounting, and built-in magnet. At this 175 mm stroke, rod bending is typically not a concern for purely axial loads, but always ensure the load is guided if any side forces are present.
Adjustable-stroke checklist
At the standard 0.5 MPa operating pressure, this cylinder generates 1559 N of push force and 1402 N of pull force. The push force is higher because the single piston rod reduces the effective area on the return stroke. The maximum theoretical force at 1.0 MPa is 318 kgf.
Only if you no longer need the adjustable stroke feature. The SCJ63X175-50S has a rear adjusting screw that provides up to 50 mm of stroke-end adjustment. A fixed-stroke SC63 will fit the same mounting and port connections, but its stroke is not field-adjustable. For a true drop-in replacement, you must use another SCJ63 with the same 175 mm nominal stroke and 50 mm adjust range.
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