The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X120-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
The AirTAC SCJ40X120-100 is a double-acting, single-rod pneumatic cylinder with a 40 mm bore and a nominal 120 mm stroke, featuring a rear-cap adjusting screw that provides a full 100 mm of field-adjustable stroke-end reduction. This allows engineers to fine-tune the piston's end position without changing the cylinder, ideal for commissioning and format changeovers. The 16 mm diameter piston rod generates 628 N of push force and 528 N of pull force at 0.5 MPa, with a maximum push force of 1130 N at 0.9 MPa.
This tie-rod cylinder uses PT1/4 ports and an M12x1.25 rod thread, with an adjustable air cushion length of 21 mm for smooth deceleration. The SCJ body length A is 185 mm, slightly longer than the fixed-stroke SC version to accommodate the adjusting mechanism. Operating on filtered air from 0.15 to 1.0 MPa, it is suitable for applications where the end-of-stroke position must be dialed in precisely on the machine.
| Model | Airtac SCJ40 Standard Cylinder SCJ40X120-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 120 mm |
| Stroke adjustment | Up to 100 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. |
| ×120 | Nominal (maximum) stroke length in mm. |
| -100 | 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 100 mm adjustable range lets technicians dial in the exact stroke end position on a new machine without swapping cylinders or machining custom stops, speeding up factory acceptance testing.
On packaging or sorting lines, the stroke can be quickly re-adjusted to handle different product sizes, eliminating the need for multiple fixed-stroke cylinders and reducing changeover downtime.
In clamping or pressing fixtures, the rear screw can be advanced to take up mechanical wear in tooling or seals over time, maintaining consistent contact force without reprogramming the machine.
Choose the SCJ40X120-100 when you need to fine-tune the stroke end position by up to 100 mm during setup or after wear. If your application requires more push force, consider stepping up to the 50 mm bore SCJ50 series, which delivers 982 N of push force at 0.5 MPa. For a fixed, non-adjustable stroke, the standard SC40 cylinder is a simpler and more cost-effective alternative. If the load introduces significant side forces, an external guide rail or a guided cylinder should be used to prevent rod bending.
This model is a direct replacement for any AirTAC SCJ40X120-100 cylinder with PT ports and basic mounting. When ordering a replacement, ensure the bore (40 mm), nominal stroke (120 mm), and adjustable range (-100) all match. If your machine uses magnetic sensors, specify the -S suffix for a built-in magnet.
Adjustable-stroke checklist
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at the 0.9 MPa operating limit is 1130 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
A rear-cap screw limits the piston's forward travel by up to 100 mm, setting the stroke end position. Choose the SCJ when you need to fine-tune this position on the machine for setup, format changes, or wear take-up. If the stroke is permanently fixed, the standard SC cylinder is a more economical choice.
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