The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X30-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 mm range without swapping the cylinder. Ø63mm bore, 30mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ63X30-20S is a double-acting, single-rod cylinder that puts field-adjustable stroke control into a compact 63 mm bore package. Its rear adjusting screw lets you shorten the stroke end by up to 20 mm without removing the cylinder, making it ideal for commissioning trials and fine-tuning end positions on the fly. At 0.5 MPa it delivers 1559 N of push force and 1402 N on the pull stroke, with a 20 mm piston rod and PT1/4 ports.
This model includes a built-in magnet, so CMSG/DMSG/EMSG reed or solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The adjustable air cushion (28 mm long) decelerates the piston smoothly, and the TPU seals work across a standard -20 to +70 °C range. The body length A(SCJ) is 197 mm, slightly longer than a fixed-stroke SC of the same bore to house the adjusting mechanism.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X30-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 30 mm |
| Stroke adjustment | Up to 20 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. |
| ×30 | Nominal (maximum) stroke length in mm. |
| -20 | 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 20 mm rear screw adjustment lets operators dial in the exact stroke end position during machine setup, compensating for fixture tolerances without swapping cylinders.
With the built-in magnet, CMSG sensors confirm the clamp has reached its adjusted end position, providing closed-loop feedback for automated assembly fixtures.
As press tooling wears over time, the adjustable stroke can be shortened slightly to maintain consistent forming depth, extending tool life between rebuilds.
Choose this 63 mm bore when your application needs roughly 1560 N of push force at standard shop air. If you need more force, step up to the 80 mm bore which provides 2513 N push at 0.5 MPa; if you need less, the 50 mm bore delivers 982 N. The 20 mm adjustment range is perfect for taking up wear on tooling or accommodating minor format changes without re-plumbing the machine. For applications requiring a fixed, non-adjustable stroke, the standard SC series is a simpler choice. This model is a direct replacement for any AirTAC SCJ63X30-20S with PT ports and a magnet.
Adjustable-stroke checklist
At 0.5 MPa the push force is 1559 N and the pull force is 1402 N. The push force is higher because the single rod reduces the effective piston area on the pull side. At the maximum operating pressure of 1.0 MPa, the theoretical push force reaches 318 kgf.
The rear cap has an adjusting screw that sets the stroke end position. The -20 code means you can shorten the nominal 30 mm stroke by up to 20 mm, giving an effective adjustable range from 10 mm to 30 mm. It adjusts the end stop only, not the speed or force.
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