Airtac SCJ40 Standard Cylinder SCJ40X400-40S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-40S 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, 400mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke400 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X400-40S
The SCJ40X400-40S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering a 40 mm adjustment range via a rear-cap screw. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it suitable for mid-range linear tasks where the final stopping position must be dialed in during commissioning or changeover.
A built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors along the tie-rod barrel for reliable end-of-stroke detection. The body length A(SCJ) is 185 mm, and the cylinder uses PT1/4 ports with an M12x1.25 rod thread. Its adjustable air cushion decelerates the piston smoothly at both ends, protecting the end caps during high-cycle operation.
Airtac SCJ40 Standard Cylinder SCJ40X400-40S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-40S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 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 SCJ40X400-40S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | 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 SCJ40X400-40S Is Used
Commissioning & Setup
The 40 mm adjustment screw lets technicians fine-tune the actuator's end position during machine bring-up, eliminating the need to machine custom stops or swap fixed-stroke cylinders.
Format Changeovers
On packaging lines, quickly adjust the push stroke for different box sizes or product widths. The SCJ40X400-40S provides 628 N of force to handle mid-weight pusher arms.
Wear Compensation
In clamping or pressing fixtures, the adjustable stroke can be periodically advanced to take up wear on tooling or workpieces, maintaining consistent contact pressure without replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-40S the Right Cylinder?
Choose the SCJ40 when you need to fine-tune the stroke end position without swapping the cylinder or adding external hard stops. If 628 N of push force is insufficient, stepping up to the SCJ50 bore provides 982 N at the same 0.5 MPa. For applications requiring a fixed, repeatable stroke with no adjustment, the standard SC series is a simpler alternative. This model matches any SCJ40 with a 400 mm nominal stroke, 40 mm adjust range, PT ports, and a magnet, using basic mounting. For strokes of 300 mm or more, evaluate side-load conditions; an external guide rail or a guided cylinder will protect the rod bearing from bending moments.
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 SCJ40X400-40S FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N. The maximum push force at 0.9 MPa operating pressure is 1130 N. The theoretical maximum at 1.0 MPa is 128 kgf.
A rear adjusting screw sets the stroke end position within a 40 mm range, shortening the nominal 400 mm stroke. Pick the SCJ when you need to fine-tune the stopping point on the machine, such as during setup or format changes. Choose a fixed-stroke SC if the stroke length is permanently fixed.
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