Airtac SCJ40 Standard Cylinder SCJ40X50-50FA
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X50-50FA 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, 50mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke50 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X50-50FA
The SCJ40X50-50FA is a 40 mm bore double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end. A rear-cap adjusting screw provides up to 50 mm of stroke shortening, enabling fine-tuning of the end position without swapping the cylinder. This model is configured with a front rectangular flange (FA) for direct panel mounting and uses standard PT ports.
At 0.5 MPa, it delivers 628 N of push force and 528 N on the pull stroke, driven by a 16 mm diameter piston rod. The cylinder body length A is 185 mm, and it features an adjustable air cushion of 21 mm for smooth deceleration. The operating range spans 0.15–1.0 MPa, with a proof pressure of 1.5 MPa.
Airtac SCJ40 Standard Cylinder SCJ40X50-50FA Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X50-50FA |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 50 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 SCJ40X50-50FA
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×50 | 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 SCJ40X50-50FA Is Used
Commissioning & Setup
The 50 mm adjustment range allows technicians to precisely set the actuator end-stop during initial machine setup without needing to fabricate custom shims or external hard stops.
Format Changeovers
On packaging or assembly lines, quickly adjust the stroke to accommodate different product sizes or pallet dimensions, reducing downtime between production runs.
Wear Compensation
In clamping or pressing fixtures, the adjustable screw can be advanced to take up mechanical wear on tooling or contact surfaces, maintaining consistent process force and position over time.
Is the Airtac SCJ40 Standard Cylinder SCJ40X50-50FA the Right Cylinder?
Choose the SCJ40X50-50FA when you need to dial in a precise end-stop position during commissioning or changeovers, with the convenience of a front flange mount. If your application requires more force, stepping up to the 50 mm bore SCJ series provides 982 N of push force at the same 0.5 MPa pressure. For a simpler, fixed-stroke solution where adjustment is not needed, the standard SC40X50 cylinder is a direct alternative.
This unit is a direct replacement for another AirTAC SCJ40 cylinder with a 50 mm nominal stroke, 50 mm adjustable range, PT ports, and FA front flange mounting. For strokes of 300 mm or more, consider an external guide or a guided cylinder to protect the 16 mm rod from side-load bending.
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 SCJ40X50-50FA 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 design, providing 528 N at 0.5 MPa. The theoretical maximum force at 1.0 MPa is 128 kgf.
This specific model, SCJ40X50-50FA, comes with a front flange (FA) for panel mounting. The SCJ series does not support clevis mounts (CA/CB), but an LB foot mount is available as an alternative accessory if you order the SCJ40X50-50LB model instead.
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