Airtac SCJ40 Standard Cylinder SCJ40X235-100
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X235-100 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 100 mm range without swapping the cylinder. Ø40mm bore, 235mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke235 mm
- Stroke adjust-100 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X235-100
The SCJ40X235-100 is a 40 mm bore double-acting single-rod air cylinder with a field-adjustable stroke end, letting you fine-tune the stop position by up to 100 mm without swapping the unit. Its 16 mm diameter rod delivers 628 N of push force at 0.5 MPa and 528 N on the pull stroke, suiting mid-force positioning and clamping tasks where the final stroke length must be dialled in precisely during commissioning or format changes.
A rear-cap adjusting screw sets the stroke end within the 100 mm range, while the nominal 235 mm stroke defines the maximum extension. The body length A(SCJ) is 185 mm plus the stroke, and the integrated air cushion (21 mm) decelerates the piston smoothly. The cylinder uses a PT1/4 port and M12x1.25 rod thread, and operates on filtered air from 0.15 to 1.0 MPa across a -20 to +70 °C temperature band.
Airtac SCJ40 Standard Cylinder SCJ40X235-100 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X235-100 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 235 mm |
| Stroke adjustment | Up to 100 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 SCJ40X235-100
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×235 | Nominal (maximum) stroke length in mm. |
| -100 | 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 SCJ40X235-100 Is Used
Commissioning & Setup Fine-Tuning
During machine bring-up, the 100 mm adjustment range lets technicians dial in the exact push stroke for part contact without iterative cylinder swaps, cutting setup time on assembly stations.
Product Changeover on Packaging Lines
When carton sizes or product heights change, operators can quickly reset the cylinder stroke end to match the new format, keeping a single actuator for multiple SKUs on case sealers or labellers.
Wear Compensation in Clamping
In fixtures where jaw pads or tooling wear over time, the adjustable stroke end takes up the lost travel, maintaining consistent clamp force without shimming or replacing the cylinder.
Is the Airtac SCJ40 Standard Cylinder SCJ40X235-100 the Right Cylinder?
Choose the SCJ40X235-100 when you need a mid-range force actuator whose end position must be tuned on the machine. If 628 N push is marginal, stepping up to the 50 mm bore (SCJ50, 982 N push at 0.5 MPa) adds force without a large footprint increase; if space is tight and less force is acceptable, the 32 mm bore (402 N push) is the next size down. For a fixed-stroke application where no field adjustment is required, the standard SC40 cylinder is a simpler, lower-cost alternative.
This 235 mm stroke is well within the 1200 mm maximum for the 40 mm bore. For a direct replacement, match the 40 mm bore, 235 mm nominal stroke, 100 mm adjust range, PT port thread, and the same mounting style. If you later add a magnet, order the SCJ40X235-100S variant to accept CMSG/DMSG sensors. At this stroke length, ensure the rod is not subjected to significant side loads; an external guide rail or a guided cylinder is recommended if lateral forces are present.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-100)
- ✓ 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 SCJ40X235-100 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 theoretical maximum at 1.0 MPa is 128 kgf.
A rear-cap screw sets the stroke end position anywhere within a 100 mm range from the nominal 235 mm maximum. It adjusts the mechanical stop, not the air pressure or speed. It can replace an SC40 of the same bore and port thread if you need field adjustability, but the SCJ body is slightly longer and the mounting accessories are a subset (no FB flange or CA/CB clevis).
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