Airtac SCJ40 Standard Cylinder SCJ40X135-30
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X135-30 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, 135mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke135 mm
- Stroke adjust-30 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X135-30
The SCJ40X135-30 is a 40 mm bore double-acting single-rod cylinder with a rear-cap adjusting screw that provides up to 30 mm of field-adjustable stroke-end reduction. At 0.5 MPa the piston rod delivers 628 N of push force and 528 N of pull force, making it suitable for light clamping, sorting, and assembly tasks where the final stop position needs on-machine fine-tuning.
This tie-rod cylinder uses a 16 mm diameter rod with an M12x1.25 rod thread and PT1/4 ports. The body length A(SCJ) is 185 mm, and the adjustable air cushion is 21 mm long. Its maximum standard stroke is 1200 mm, so the 135 mm nominal stroke is well within the standard range.
Airtac SCJ40 Standard Cylinder SCJ40X135-30 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X135-30 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 135 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 SCJ40X135-30
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×135 | 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 SCJ40X135-30 Is Used
Commissioning Fine-Tuning
The 30 mm adjust range lets technicians dial in the exact stroke end during machine setup without swapping cylinders or machining external hard stops, speeding up line commissioning.
Product Changeover
On packaging or sorting conveyors, the adjustable stroke allows operators to quickly reset the pusher end position for different box or product sizes, reducing changeover downtime.
Wear Compensation
In repetitive pressing or clamping fixtures, the stroke can be extended slightly over time to compensate for pad or tooling wear, maintaining consistent contact force without replacing parts.
Is the Airtac SCJ40 Standard Cylinder SCJ40X135-30 the Right Cylinder?
Choose this 40 mm bore when your application needs around 628 N of push force at standard plant air. If you need more force, stepping up to the 50 mm bore (SCJ50) provides 982 N of push at 0.5 MPa. For a simpler, fixed-stroke solution where no adjustment is needed, the standard SC series is a more economical choice. An exact replacement must match the SCJ40 bore, 135 mm nominal stroke, 30 mm adjustment range, PT port thread, and basic mounting style.
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 SCJ40X135-30 FAQ
The push force is 628 N at 0.5 MPa and 1130 N at the maximum operating pressure of 0.9 MPa. The pull force is lower due to the single rod's area, producing 528 N at 0.5 MPa. The adjusting screw does not alter the cylinder's force output.
A screw in the rear cap limits how far the piston can retract. Turning the screw changes the stroke end position by up to 30 mm, giving you a field-adjustable stroke without changing the cylinder's nominal 135 mm rating. It adjusts the end position only, not the speed or force.
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