Airtac SCJ40 Standard Cylinder SCJ40X250-50S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X250-50S 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, 250mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke250 mm
- Stroke adjust-50 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X250-50S
The SCJ40X250-50S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, offering a 50 mm adjustment range on its 250 mm nominal stroke. The rear-cap screw allows precise end-position tuning without removing the cylinder, making it ideal for commissioning and format changeovers. With a 16 mm piston rod and PT1/4 ports, this 40 mm bore unit delivers 628 N of push force at 0.5 MPa and up to 1130 N at 0.9 MPa.
This model includes a built-in magnet (-S suffix), enabling direct mounting of CMSG/DMSG/EMSG reed or solid-state sensors along the tie-rod barrel for reliable end-of-stroke detection. The adjustable air cushion decelerates the piston smoothly, and the TPU seal ensures consistent operation from -20 to +70 °C. The body length A(SCJ) is 185 mm, providing a compact yet robust solution for medium-force industrial tasks.
Airtac SCJ40 Standard Cylinder SCJ40X250-50S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X250-50S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 250 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 SCJ40X250-50S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×250 | 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 SCJ40X250-50S Is Used
Commissioning & Setup
The 50 mm rear adjustment screw allows engineers to dial in the exact stroke end position on a new machine without fabricating custom stops, accelerating the commissioning of packaging or assembly stations.
Format Changeovers
Quickly adapt the cylinder's end-stop for different product sizes on a conveyor diverter or labeling machine. The magnetic piston provides sensor feedback to the PLC for each new format position.
Wear Compensation
In clamping or pressing applications, the stroke can be incrementally extended over time to compensate for tooling or pad wear, maintaining consistent contact force without replacing the actuator.
Is the Airtac SCJ40 Standard Cylinder SCJ40X250-50S the Right Cylinder?
Choose the SCJ40X250-50S when you need to fine-tune the stroke end position within a 50 mm window during setup or product changeovers. If your force requirement is lower, the 32 mm bore SCJ series provides 402 N of push force at 0.5 MPa; for higher demands, stepping up to the 50 mm bore delivers 982 N. This adjustable-stroke unit is the right choice over a fixed-stroke SC cylinder when the exact stroke length is not finalized or may need periodic adjustment.
For a direct replacement, match an AirTAC SCJ cylinder with a 40 mm bore, 250 mm nominal stroke, a 50 mm adjustment range, PT ports, and a magnetic piston. At this 250 mm stroke, ensure the rod is not subjected to significant side loads; if lateral forces are present, integrate an external linear guide. The basic mounting style requires a rigid, aligned support structure for the cylinder body.
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 SCJ40X250-50S FAQ
At 0.5 MPa, the cylinder provides 628 N of push force and 528 N of pull force. The maximum push force at the 0.9 MPa operating limit is 1130 N. The pull force is lower due to the area of the 16 mm piston rod.
A screw in the rear cap acts as an adjustable end-stop for the piston, allowing you to shorten the stroke end by up to 50 mm from the nominal 250 mm. It sets the physical stopping point and does not regulate air pressure, speed, or force.
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