Airtac SCJ40 Standard Cylinder SCJ40X40-30S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X40-30S 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, 40mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke40 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X40-30S
The SCJ40X40-30S is a double-acting, single-rod pneumatic cylinder that puts stroke-end fine-tuning directly on the machine. Its rear-cap adjusting screw lets you shorten the effective stroke by up to 30 mm without swapping the cylinder or adding external hard stops, making it ideal for commissioning trials and format changeovers. With a 16 mm piston rod and PT1/4 ports, this 40 mm bore unit delivers 628 N of push force at 0.5 MPa, scaling to 1130 N at the maximum operating pressure of 0.9 MPa.
This model includes a built-in magnet (-S suffix), so standard CMSG, DMSG, or EMSG reed and solid-state sensors clamp directly onto the tie-rod barrel for reliable end-of-stroke detection. The body length A(SCJ) is 185 mm, and the adjustable air cushion decelerates the piston smoothly at both ends. It is a genuine AirTAC component backed by full traceability, ready to drop into your existing SCJ setup.
Airtac SCJ40 Standard Cylinder SCJ40X40-30S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X40-30S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 40 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 SCJ40X40-30S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×40 | 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 SCJ40X40-30S Is Used
End-Stop Calibration
Fine-tune the retract stroke end position during machine commissioning without removing the cylinder. The 30 mm adjustment screw lets technicians dial in the exact stopping point for grippers or pushers.
Product Format Changeover
Quickly adapt a diverter or gate stroke for different box sizes on a packaging line. Operators adjust the rear screw in seconds, avoiding downtime for cylinder swaps.
Sensor-Ready Assembly
The integrated magnet allows CMSG/DMSG sensors to confirm the adjusted stroke end position, providing closed-loop feedback for pick-and-place or press-fit stations.
Is the Airtac SCJ40 Standard Cylinder SCJ40X40-30S the Right Cylinder?
Choose the SCJ40 when you need a compact, adjustable-stroke cylinder in the 40 mm bore class. If your application demands more force, stepping up to the 50 mm bore SCJ50 delivers 982 N of push at 0.5 MPa, while a step down to the 32 mm bore provides 402 N. If your stroke never needs field adjustment, the fixed-stroke SC series offers a simpler, lower-cost alternative with the same mounting footprint.
For a direct replacement, match the 40 mm bore, 40 mm nominal stroke, 30 mm adjustment range (-30), PT port thread, and the built-in magnet (-S). This SCJ uses the basic mounting style; if you later need a pivot mount, the F-SC40TC centre trunnion kit is available. Ensure the load is guided externally if side forces are present, as this is a single-rod cylinder.
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 SCJ40X40-30S 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 16 mm piston rod reduces the effective area on the return stroke.
Only if you do not need the adjustable stroke feature. An SC40X40 will fit the same mounting and port connections but has a fixed 40 mm stroke. To retain the field-adjustable stroke end, you must replace it with another SCJ40X40-30S or an SCJ with the same bore, nominal stroke, and adjustment range.
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