Airtac SCJ40 Standard Cylinder SCJ40X275-75
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X275-75 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke275 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X275-75
The SCJ40X275-75 is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. A rear-cap adjusting screw provides up to 75 mm of retraction from the 275 mm nominal maximum, so commissioning engineers and maintenance teams can dial in the exact stopping position without swapping cylinders or adding external hard stops. The 40 mm bore delivers 628 N of push force at 0.5 MPa and 1130 N at the maximum operating pressure of 0.9 MPa, driven by a 16 mm diameter piston rod.
This model belongs to the AirTAC SCJ adjustable-stroke family, a tie-rod cylinder built for flexible automation. It uses a PT1/4 port, an M12x1.25 rod thread, and a 21 mm air cushion to decelerate the piston quietly. The body length A(SCJ) is 185 mm, slightly longer than the fixed-stroke SC version to accommodate the adjusting mechanism. Standard TPU seals suit ambient temperatures from -20 to +70 °C, and the cylinder is rated for filtered air at 0.15–1.0 MPa with a proof pressure of 1.5 MPa.
Airtac SCJ40 Standard Cylinder SCJ40X275-75 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X275-75 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 275 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 SCJ40X275-75
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×275 | 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 SCJ40X275-75 Is Used
Commissioning & Setup Trials
During machine bring-up, engineers can back out the 75 mm adjusting screw to experimentally find the optimal stroke end for a gripper or pusher, then lock it in place without any mechanical rework.
Multi-Format Packaging Lines
When a packaging line switches between product sizes, the SCJ40X275-75 lets operators quickly reset the cylinder’s end-stop to match a new box depth or tray width, minimizing changeover downtime.
Wear Compensation in Clamping
In clamping or pressing fixtures where tooling surfaces gradually wear, the rear adjuster can be advanced periodically to take up the slack and maintain consistent clamping force without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X275-75 the Right Cylinder?
Choose the SCJ40X275-75 when you need to commission a stroke precisely or accommodate format changes within a 75 mm window. If your application demands higher force, stepping up to the 50 mm bore delivers 982 N of push at 0.5 MPa; for a lighter, more compact solution, the 32 mm bore provides 402 N. This adjustable-stroke cylinder is ideal where the stroke end must be field-tuned, but if your stroke is permanently fixed, the standard SC series offers a simpler, cost-effective alternative. For direct replacement, match the 40 mm bore, 275 mm nominal stroke, 75 mm adjust range, PT1/4 ports, and basic mounting configuration.
With a 275 mm stroke, consider the potential for side loading on the 16 mm rod. If the load is not guided externally, rod deflection can accelerate seal wear. Adding an external guide rail or switching to a guided cylinder assembly is recommended when the piston rod must support off-axis forces or moments.
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 SCJ40X275-75 FAQ
The cylinder generates 628 N pushing and 528 N pulling at 0.5 MPa. At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The rear adjusting screw only changes the stroke end position within a 75 mm range; it does not alter the bore area, operating pressure, or output force.
Yes, provided the bore (40 mm), nominal stroke (275 mm), port size (PT1/4), and mounting style match. The SCJ body is slightly longer (185 mm A-length) to house the rear adjuster, so verify the available envelope space. The adjustable stroke adds field-tuning capability that the fixed-stroke SC does not have.
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