Airtac SCJ40 Standard Cylinder SCJ40X80-50
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-50 is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 50 mm range without swapping the cylinder. Ø40mm bore, 80mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke80 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X80-50
The AirTAC SCJ40X80-50 is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. Its rear-cap screw provides a 50 mm adjustment range, letting you fine-tune the end position from 30 mm to the full 80 mm nominal stroke without swapping the cylinder. This model delivers 628 N of push force and 528 N of pull force at 0.5 MPa, with a 16 mm diameter piston rod and PT1/4 ports.
Built on a proven tie-rod design, the SCJ40X80-50 features an adjustable air cushion for smooth deceleration and a durable TPU seal as standard. The body length (A dimension) is 185 mm, making it a compact solution for applications where the stroke needs to be dialed in during commissioning or changed for different product formats.
Airtac SCJ40 Standard Cylinder SCJ40X80-50 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-50 |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 50 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 SCJ40X80-50
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | Nominal (maximum) stroke length in mm. |
| -50 | 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 SCJ40X80-50 Is Used
Format Changeovers
Quickly adjust the end stop for different box or product sizes on a packaging line without mechanical modifications, reducing downtime between batches.
Commissioning & Setup
Dial in the exact actuator stroke required during machine commissioning to compensate for assembly tolerances or fine-tune the motion profile.
Wear Compensation
Extend the effective stroke slightly over time to compensate for mechanical wear in grippers or linkages, maintaining consistent clamping or pressing force.
Is the Airtac SCJ40 Standard Cylinder SCJ40X80-50 the Right Cylinder?
Choose the SCJ40X80-50 when you need to precisely set a stroke end position within a 50 mm window on a 40 mm bore platform. If your force requirements are lower, the smaller SCJ32 series provides 402 N of push force at 0.5 MPa. For higher force, step up to the SCJ50, which delivers 982 N at the same pressure. If your application requires a fixed, non-adjustable stroke, the standard SC series is a more economical choice. For a direct replacement, match the 40 mm bore, 80 mm nominal stroke, 50 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 (-50)
- ✓ 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 SCJ40X80-50 FAQ
At the standard 0.5 MPa operating pressure, this 40 mm bore cylinder generates 628 N of push force and 528 N of pull force. The push force is higher because the rod reduces the effective piston area on the return stroke. At the maximum operating pressure of 1.0 MPa, the theoretical push force is 128 kgf.
The rear adjusting screw physically limits the piston's travel at the retract end, letting you shorten the stroke by up to 50 mm from the 80 mm nominal maximum. It is a mechanical end-stop, not a position lock. 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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