Airtac SCJ40 Standard Cylinder SCJ40X400-30S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X400-30S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 30 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-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X400-30S
The SCJ40X400-30S is a double-acting, single-rod pneumatic cylinder that puts field-adjustable stroke control directly into a 40 mm bore package. Its rear-cap adjusting screw lets you shorten the stroke end by up to 30 mm without removing the cylinder, delivering a push force of 628 N at 0.5 MPa and 1130 N at the 0.9 MPa maximum operating pressure. The built-in magnet (-S suffix) allows CMSG/DMSG/EMSG sensors to clamp directly onto the tie-rod barrel for reliable end-of-stroke sensing.
With a 16 mm diameter piston rod, PT1/4 ports, and a 21 mm air cushion, this model handles a 400 mm nominal stroke while staying within the bore's 1200 mm maximum standard stroke. The adjustable-stroke design is ideal for commissioning fine-tuning, format changeovers, and applications where the exact stop position must be dialled in on the machine. Body length A is 185 mm plus stroke, making it a compact choice for space-constrained setups.
Airtac SCJ40 Standard Cylinder SCJ40X400-30S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X400-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 400 mm |
| Stroke adjustment | Up to 30 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 SCJ40X400-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×400 | Nominal (maximum) stroke length in mm. |
| -30 | 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 SCJ40X400-30S Is Used
Commissioning & Setup
Dial in the exact stroke end position during machine commissioning. The 30 mm adjustment range lets technicians fine-tune the stop point without swapping cylinders or machining external hard stops.
Format Changeovers
On packaging or sorting lines, quickly adjust the cylinder stroke to handle different product sizes. The rear screw makes format changes a quick, tool-free operation that minimises downtime.
Wear Compensation
In clamping or pressing fixtures, use the adjustable stroke to take up mechanical wear over time. The 30 mm range provides ample compensation, and the built-in magnet confirms full clamp position with a sensor.
Is the Airtac SCJ40 Standard Cylinder SCJ40X400-30S the Right Cylinder?
Choose the SCJ40X400-30S when you need to adjust the stroke end position by up to 30 mm on a 40 mm bore platform. If your force requirement grows, stepping up to the SCJ50 series provides 982 N of push at 0.5 MPa; for a lighter load, the SCJ32 delivers 402 N. The built-in magnet makes sensor mounting tool-free, so if your application does not require position feedback, the non-magnet SCJ40X400-30 saves cost while keeping the same mechanical performance.
For a 400 mm stroke, always assess side-loading. At this extended length, the 16 mm rod can deflect under off-centre loads. If your load is not guided externally, consider pairing this cylinder with a linear guide or switching to a guided cylinder to protect the rod bearing and seal. This model is a direct replacement for any AirTAC SCJ40X400-30S with PT ports and basic mounting.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-30)
- ✓ 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 SCJ40X400-30S FAQ
At 0.5 MPa, the cylinder provides 628 N of push force and 528 N of pull force. The push force is higher because the single-rod design means air pressure acts on the full bore area during extension. At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N.
A rear-cap adjusting screw lets you shorten the stroke end by up to 30 mm. This is a mechanical stop adjustment, not a force or speed control. Choose the SCJ when you need to fine-tune the stroke position on the machine—for commissioning, format changes, or wear take-up. If your stroke length is fixed and never needs field adjustment, the standard SC series is a more economical choice.
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