Airtac SCJ40 Standard Cylinder SCJ40X120-50S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X120-50S 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, 120mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke120 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X120-50S
The SCJ40X120-50S is a double-acting, single-rod cylinder that puts stroke-end fine-tuning directly in your hands. With a 50 mm adjustment range on the rear screw, you can dial in the exact 120 mm nominal stroke position without swapping the cylinder or adding hard stops. Its 16 mm rod and PT1/4 port deliver 628 N of push force at a standard 0.5 MPa, scaling up to 1130 N at 0.9 MPa.
A built-in magnet is factory-installed, letting you clamp CMSG/DMSG/EMSG sensors directly onto the tie-rod barrel for reliable end-of-stroke or mid-stroke position feedback. The 185 mm body length keeps the assembly compact for its 40 mm bore class, and the adjustable air cushion decelerates the piston smoothly across the 30-800 mm/s speed range.
Airtac SCJ40 Standard Cylinder SCJ40X120-50S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X120-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 120 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 SCJ40X120-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×120 | 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 SCJ40X120-50S Is Used
Commissioning & Setup
Speed up machine commissioning by adjusting the stroke end on the fly to match mating tooling, eliminating the need to shim or reposition hard stops during initial runoff.
Format Changeover
Quickly adapt the cylinder stroke for different product sizes on a packaging or sorting line. The 50 mm range handles multiple formats without mechanical changes.
Wear Compensation
Take up mechanical play or seal wear over time by slightly extending the effective stroke, maintaining consistent clamp or press force without replacing the actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X120-50S the Right Cylinder?
Choose the SCJ40X120-50S when your application needs a 40 mm bore with field-tunable stroke. If you need more force, stepping up to the 50 mm bore provides 982 N of push at 0.5 MPa. For applications where the stroke is fixed and never needs field changes, the standard SC series offers a simpler, lower-cost alternative. This model is a direct replacement for any AirTAC SCJ40X120-50S with a PT port and magnet, matching bore, nominal stroke, and the 50 mm adjust range exactly.
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 SCJ40X120-50S FAQ
At 0.5 MPa, this cylinder produces 628 N of push force and 528 N of pull force due to the 16 mm rod area. At the maximum operating pressure of 0.9 MPa, push force reaches 1130 N.
A rear-cap adjusting screw limits the piston's retract stroke end. Turning the screw changes the end position within a 50 mm range, allowing you to fine-tune the stroke without altering the 120 mm nominal rating or cylinder mounting.
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