The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-40STC 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. Ø40mm bore, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The SCJ40X80-40STC is a tie-rod, double-acting single-rod cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw lets you shorten the effective stroke by up to 40 mm without removing the cylinder, which is a real time-saver during commissioning or when a fixture wears in. The 40 mm bore delivers 628 N of push force at 0.5 MPa, and the 16 mm rod diameter keeps the assembly stiff for pick-and-place or clamping tasks.
This particular model ships with a built-in magnet (-S) so CMSG/DMSG/EMSG sensors can clamp straight onto the barrel for end-of-stroke sensing, and it includes the TC centre trunnion mount with the TCM1 bracket (order code F-SC40TC) for pivoting applications. The port is PT1/4, the cushion length is 21 mm, and the body length A(SCJ) is 185 mm. Operating pressure runs from 0.15 to 1.0 MPa with filtered air, and the standard TPU seal works from -20 to +70 °C.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-40STC |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 40 mm (rear adjusting screw) |
| Acting type | Double acting (single rod) |
| Port size | PT1/4 |
| Rod thread | M12×1.25 |
| 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, 21 mm |
| Max stroke | Up to 1200 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 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. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | 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.
Dial in the exact end position on a new assembly line without swapping hard stops. The 40 mm adjustment screw lets technicians fine-tune the stroke while the machine is at rest, cutting setup time.
When a packaging line switches between box sizes, the operator can quickly reset the cylinder stroke to match the new case dimension. The centre trunnion mount allows the cylinder to pivot as the linkage moves.
On a clamping fixture where pads compress over time, the stroke can be extended slightly via the rear screw to restore full clamping force without replacing the cylinder or adding shims.
Choose this 40 mm bore when your load needs around 628 N push at standard plant pressure; if you can drop to 402 N, the 32 mm bore (SCJ32) saves space and air, while stepping up to the 50 mm bore (SCJ50) gives you 982 N push at the same 0.5 MPa. The 40 mm adjustable range is generous for format changeovers or taking up stack-up tolerances, but if you only need a fixed stroke, the SC series removes the adjusting screw and shortens the overall length slightly.
For a direct replacement, match the SCJ40 bore, 80 mm nominal stroke, 40 mm adjust range, PT1/4 port, TC centre trunnion mount, and the -S magnet. SCJ mounting accessories are a subset of the SC range—this model uses the TC trunnion, not the FB flange or CA/CB clevis. At 80 mm stroke, rod bending is not a concern under normal axial loads, but always align the rod with the load path to avoid side-loading the bearing.
Adjustable-stroke checklist
At 0.5 MPa the push force is 628 N and the pull force is 528 N (the difference is due to the 16 mm rod area). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The adjustable stroke screw does not change the force output.
The SCJ body is slightly longer to house the adjusting mechanism (A dimension 185 mm), so check your space envelope. The port (PT1/4), rod thread (M12x1.25), and mounting footprint are otherwise compatible if you are already using a basic or TC mount. You must also account for the -S magnet and TCM1 bracket if your original cylinder lacked them.
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