Airtac SCJ40 Standard Cylinder SCJ40X275-40
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X275-40 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, 275mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke275 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X275-40
The SCJ40X275-40 is a double-acting, single-rod pneumatic cylinder that integrates a rear-cap adjusting screw, giving you a 40 mm field-adjustable stroke range without removing the unit from the machine. With a 40 mm bore and a 16 mm piston rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a capable mid-range actuator for tasks that need fine end-position tuning.
This tie-rod cylinder uses a PT1/4 port and has a 21 mm air cushion at each end to decelerate the piston quietly. The body length A(SCJ) is 185 mm, and the standard TPU seals keep it running from -20 to +70 °C. Because the adjusting screw only sets the stroke end, the cylinder does not hold a load if air pressure is lost—an external lock or pilot-operated check valve is required for static holding.
Airtac SCJ40 Standard Cylinder SCJ40X275-40 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X275-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 275 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.
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 SCJ40X275-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×275 | 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.
Where the Airtac SCJ40 Standard Cylinder SCJ40X275-40 Is Used
Commissioning & Setup Trials
The 40 mm adjustment screw lets technicians dial in the exact stroke end during machine commissioning without cutting brackets or adding external hard stops, speeding up the runoff phase.
Wear Compensation
In clamping or pressing fixtures, the stroke can be extended slightly over time to compensate for pad or tooling wear, maintaining consistent contact force without replacing the cylinder.
Format Changeover
On packaging or sorting lines that handle different product sizes, operators can quickly adjust the pusher stroke by up to 40 mm to match a new box or tray dimension.
Is the Airtac SCJ40 Standard Cylinder SCJ40X275-40 the Right Cylinder?
Step up to the SCJ50 bore if you need more force; at 0.5 MPa it provides 982 N of push, a 56 % increase over this model’s 628 N. If your application does not require on-machine stroke changes, the fixed-stroke SC40 series offers the same bore and mounting footprint without the rear adjustment mechanism. For a direct replacement, match the 40 mm bore, 275 mm nominal stroke, 40 mm adjust range, PT thread, and basic mounting. At 275 mm of stroke, the rod is well-supported by the bore’s guide bush, but if the load applies a side force, consider an external guide rail or switch to a guided cylinder to protect the rod bearing from premature wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-40)
- ✓ 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 SCJ40X275-40 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, push force reaches 1130 N. The pull force is lower because the rod reduces the effective piston area on the return stroke.
Yes, provided the mounting and porting match. The SCJ40X275-40 has the same bore, rod size, and PT1/4 port as an SC40, but the body is slightly longer to house the rear adjusting screw. Ensure you have clearance behind the rear cap for the screw and lock nut.
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