Airtac SCJ40 Standard Cylinder SCJ40X35-40
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X35-40 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, 35mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke35 mm
- Stroke adjust-40 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X35-40
The SCJ40X35-40 brings field-adjustable stroke control to the 40 mm bore class, letting you dial the stroke end back by up to 40 mm with the rear-cap adjusting screw. Its 16 mm piston rod and PT1/4 ports deliver 628 N of push force at 0.5 MPa, rising to 1130 N at the 0.9 MPa maximum operating pressure, making it a solid fit for clamping, ejecting, and light pressing tasks where the final stop position needs fine-tuning on the machine.
Built on the same tie-rod platform as the fixed-stroke SC series, this double-acting single-rod cylinder includes an adjustable air cushion (21 mm cushion length) and a compact body length A of 185 mm. The screw only sets the stroke end position—it does not alter the bore force or act as a speed controller—so you get repeatable, mechanical stroke adjustment without external hard stops or cylinder swaps.
Airtac SCJ40 Standard Cylinder SCJ40X35-40 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X35-40 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 35 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 SCJ40X35-40
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×35 | 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 SCJ40X35-40 Is Used
Commissioning & Setup Fine-Tuning
During machine bring-up, the 40 mm adjust range lets technicians quickly dial in the exact stroke end for a 40 mm bore actuator without fabricating custom stops, speeding up the debug cycle.
Wear Take-Up on Clamp Units
On a 40 mm bore clamping station, the screw compensates for jaw or pad wear over time. Operators can restore full clamping force by adjusting the stroke end in the field, extending service intervals.
Format Changeover on Packaging Lines
When a packaging machine switches between product sizes, the SCJ40X35-40 allows the stroke end to be reset for different box heights or seal-bar positions without swapping the cylinder, reducing downtime.
Is the Airtac SCJ40 Standard Cylinder SCJ40X35-40 the Right Cylinder?
Choose the SCJ40X35-40 when your application benefits from a 40 mm adjustable range on a 35 mm nominal stroke—ideal for commissioning trials or format changeovers where the exact stop point is still being dialled in. If you need more force, step up to the 50 mm bore SCJ50 family (982 N push at 0.5 MPa); if space is tight and force requirements are lower, the 32 mm bore SCJ32 series (402 N push at 0.5 MPa) may fit. For applications that do not require stroke adjustment, the fixed-stroke SC40 cylinder is a simpler, lighter alternative. A direct replacement must match the 40 mm bore, 35 mm nominal stroke, 40 mm adjust range, PT thread, and basic mounting style.
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 SCJ40X35-40 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N (the difference is due to the 16 mm single piston rod). At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N. The adjustable-stroke screw does not change these force values.
Only if you need the adjustable-stroke feature. The SCJ body is slightly longer to house the rear adjusting screw. You must match the 40 mm bore, PT1/4 ports, and mounting style. If stroke adjustment is not required, the standard SC40 is a direct dimensional match for existing fixed-stroke installations.
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