Airtac SCJ40 Standard Cylinder SCJ40X250-75S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-75S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 75 mm range without swapping the cylinder. Ø40mm bore, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke250 mm
- Stroke adjust-75 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X250-75S
The AirTAC SCJ40X250-75S is a double-acting, single-rod pneumatic cylinder featuring a rear-cap adjusting screw that provides up to 75 mm of field-adjustable stroke reduction. With a 40 mm bore and 16 mm diameter piston rod, this unit delivers 628 N of push force at 0.5 MPa, making it a versatile actuator for applications requiring fine-tuned end-position control without swapping the cylinder.
This model includes a built-in magnet (-S suffix), allowing CMSG/DMSG/EMSG reed or solid-state sensors to be clamped directly onto the tie-rod barrel for non-contact position sensing. The body length A(SCJ) is 185 mm, and the standard PT1/4 port and M12x1.25 rod thread ensure straightforward integration into existing pneumatic circuits. Its 21 mm air cushion decelerates the piston smoothly at the stroke end.
Airtac SCJ40 Standard Cylinder SCJ40X250-75S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-75S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 mm |
| Stroke adjustment | Up to 75 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 SCJ40X250-75S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | Nominal (maximum) stroke length in mm. |
| -75 | 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 SCJ40X250-75S Is Used
Commissioning & Process Tuning
The 75 mm adjustable stroke allows technicians to fine-tune the end-stop position on a new assembly line without removing the cylinder, speeding up initial setup and troubleshooting.
Product Changeover Stations
Quickly adapt the push stroke for different product sizes on a packaging line. The rear screw adjusts the final position, ensuring consistent placement without reprogramming a servo.
Wear Compensation in Clamping
In a clamping fixture, the stroke can be slightly extended over time to compensate for pad wear, maintaining consistent clamping force without mechanical shims.
Is the Airtac SCJ40 Standard Cylinder SCJ40X250-75S the Right Cylinder?
Choose the SCJ40X250-75S when you need to dial in a precise stroke end position during commissioning or format changes, with the flexibility of a 75 mm adjustment range. If your force requirement increases, stepping up to the 50 mm bore SCJ50 series provides 982 N of push force at the same 0.5 MPa pressure. For applications where the stroke is fixed and never needs field adjustment, the standard SC40 fixed-stroke cylinder offers a more economical solution.
This cylinder is a direct replacement for an existing AirTAC SCJ40X250-75S with a PT port and built-in magnet. For strokes of 250 mm, ensure the rod is adequately supported if significant side loads are present; an external guide rail or switching to a guided cylinder assembly will prevent rod bending and premature seal wear.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-75)
- ✓ 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 SCJ40X250-75S FAQ
At the standard operating pressure of 0.5 MPa, this cylinder generates 628 N of push force and 528 N of pull force. The maximum push force at 0.9 MPa is 1130 N. The adjustable stroke screw does not alter the cylinder's force output.
The rear-cap adjusting screw mechanically limits how far the piston can extend, shortening the stroke by up to 75 mm from its nominal 250 mm maximum. This is a mechanical end-stop, not a locking device. The cylinder will not hold its position if air pressure is lost; an external rod lock or pilot-operated check valve is required for load holding.
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