Airtac SCJ40 Standard Cylinder SCJ40X250-75
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-75 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke250 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X250-75
The SCJ40X250-75 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, letting you fine-tune the piston stop position by up to 75 mm without swapping the unit. Its 40 mm bore delivers 628 N of push force at 0.5 MPa, dropping to 528 N on the pull stroke due to the 16 mm rod, making it a practical actuator for mid-range positioning tasks.
This tie-rod cylinder uses a rear-cap adjusting screw to shorten the nominal 250 mm stroke, and the built-in variable air cushion (21 mm length) decelerates the load smoothly. The body length A(SCJ) is 185 mm, and the rod end carries an M12x1.25 male thread for mounting tooling or a rod clevis.
Airtac SCJ40 Standard Cylinder SCJ40X250-75 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 75 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.
Theoretical Output Force (Ø40mm)
| 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.
Model Code: Airtac SCJ40 Standard Cylinder SCJ40X250-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -75 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X250-75 Is Used
Commissioning & Setup
Dial in the exact end-of-stroke position during machine commissioning without needing to machine custom stops or swap cylinders, saving hours of mechanical fitting time.
Product Changeover
Quickly adjust a pusher or diverter stroke when packaging lines switch between product sizes, eliminating the need for multiple fixed-stroke cylinders and reducing changeover downtime.
Wear Compensation
Take up mechanical play or seal wear in a clamping or pressing fixture over time by simply turning the rear adjusting screw to restore the original contact position.
Is the Airtac SCJ40 Standard Cylinder SCJ40X250-75 the Right Cylinder?
Step up to a 50 mm bore SCJ for 982 N of push force at the same 0.5 MPa if the 628 N from this 40 mm unit is marginal. For applications that never need stroke adjustment, a fixed-stroke SC40X250 cylinder is a simpler, lower-cost alternative. If you are replacing an existing SCJ, match the bore (40), nominal stroke (250), and the 75 mm adjust range, along with the PT port thread and basic mounting style.
At a 250 mm stroke, the rod is fully supported by the front bushing, but if the load applies a significant side force, add an external guide rail or switch to a guided cylinder to prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ Required force at your working pressure
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Set the rear adjusting screw, then lock it before running.
- check Adjust end cushion screws for smooth stops.
- check Use SCJ mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac SCJ40 Standard Cylinder SCJ40X250-75 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N. The pull force is always lower because the 16 mm piston rod reduces the effective area on the return stroke.
A screw in the rear cap acts as an internal stop for the piston, allowing you to shorten the stroke end by up to 75 mm from the nominal 250 mm. It adjusts the end position only and does not change the cylinder's force, speed, or the fact that it is a double-acting unit.
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