The AirTAC Airtac SCJ63 Standard Cylinder SCJ63X120-40S 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, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
This SCJ63X120-40S is a double-acting, single-rod pneumatic cylinder that puts 1559 N of push force at 0.5 MPa into a compact, field-adjustable package. The rear-cap adjusting screw lets you fine-tune the stroke end by up to 40 mm without removing the cylinder, which is invaluable during commissioning or when a machine needs to handle slight variations in part size. The 20 mm rod and 28 mm air cushion work together to provide smooth, controlled motion.
The built-in magnet (denoted by the -S suffix) allows CMSG, DMSG, or EMSG sensors to be clamped directly onto the tie-rod barrel for reliable, non-contact position sensing. With a body length A of 197 mm and a PT1/4 port, it's a direct dimensional replacement for another AirTAC SCJ of the same bore and stroke configuration.
| Model | Airtac SCJ63 Standard Cylinder SCJ63X120-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø63 mm |
| Nominal stroke | 120 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. |
| ×120 | 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.
Fine-tune the final stop position of a clamping or pressing tool during initial machine build-out, eliminating the need for shims or custom end stops.
Quickly adjust the stroke end to accommodate a new product size on a packaging or sorting line, reducing downtime between batches.
Periodically adjust the screw to take up mechanical play or tooling wear in a high-cycle assembly fixture, maintaining consistent process quality.
Choose the SCJ63 bore when the 50 mm bore's 982 N push force at 0.5 MPa is marginal for your load. If you need more power, stepping up to the 80 mm bore provides 2513 N. This adjustable-stroke model is the right choice over a fixed-stroke SC when the exact end position needs to be dialed in on the machine. For a direct replacement, match the 63 mm bore, 120 mm nominal stroke, 40 mm adjust range, PT ports, and the -S magnet option. If your application involves significant side loads on the 120 mm stroke, an external guide rail or switching to a guided cylinder is recommended to prevent rod bending.
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 rod reduces the effective piston area on the retract side. At the maximum 0.9 MPa pressure, the push force reaches 2805 N.
A rear-cap screw mechanically limits the piston's outward travel, letting you shorten the effective stroke by up to 40 mm from the 120 mm nominal maximum. It is a direct, form-fit replacement for any AirTAC SCJ63 cylinder with a 120 mm stroke and 40 mm adjust range, provided the port thread (PT) and magnet option match.
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