Airtac SCJ40 Standard Cylinder SCJ40X80-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X80-20S is a genuine double-acting SINGLE-ROD air cylinder with a rear-cap ADJUSTING SCREW: the stroke end is field-adjustable within a 20 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-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X80-20S
The SCJ40X80-20S is a double-acting, single-rod pneumatic cylinder that lets you fine-tune the stroke end position by up to 20 mm without swapping the unit. Its 40 mm bore delivers 628 N of push force at 0.5 MPa, making it a solid choice for light pressing, clamping, and ejection tasks where the final stop point needs on-machine adjustment.
A built-in magnet (the -S suffix) allows CMSG/DMSG/EMSG reed or solid-state sensors to clamp directly onto the tie-rod barrel for end-of-stroke detection. The cylinder uses a 16 mm diameter rod, PT1/4 ports, and an M12x1.25 rod thread, with a 21 mm air cushion at each end to decelerate the piston smoothly.
Airtac SCJ40 Standard Cylinder SCJ40X80-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X80-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 80 mm |
| Stroke adjustment | Up to 20 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 SCJ40X80-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×80 | Nominal (maximum) stroke length in mm. |
| -20 | 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 SCJ40X80-20S Is Used
Commissioning & Setup
Dial in the exact stroke end during machine commissioning without cutting guide rails or adding external hard stops. The 20 mm adjustment screw lets technicians quickly compensate for assembly tolerances.
Product Changeover
When a packaging line switches between box sizes, the adjustable stroke lets operators reset the pusher end position in seconds. The 80 mm nominal stroke covers a wide range, while the screw handles the final 20 mm of fine positioning.
Wear Compensation
In clamping fixtures, tooling wear gradually changes the clamp point. The rear adjusting screw provides 20 mm of take-up range to restore full clamping force without replacing the cylinder or machining new stops.
Is the Airtac SCJ40 Standard Cylinder SCJ40X80-20S the Right Cylinder?
Step up to the 50 mm bore SCJ if your application needs more push force (982 N at 0.5 MPa); step down to the 32 mm bore (402 N at 0.5 MPa) for lighter, more compact installations. If you never need to alter the stroke after installation, the fixed-stroke SC40 series is a simpler, cost-effective alternative.
For a direct replacement, match the 40 mm bore, 80 mm nominal stroke, 20 mm adjust range, PT port thread, basic mounting, and the -S magnet option on another AirTAC SCJ adjustable-stroke cylinder. This model is a tie-rod design, not an ISO 15552 cylinder, so dimensional interchangeability is limited to AirTAC SCJ units.
Adjustable-stroke checklist
- ✓ Need to fine-tune stroke on the line?
- ✓ Nominal stroke + adjust range (-20)
- ✓ 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 SCJ40X80-20S FAQ
At 0.5 MPa air pressure, it generates 628 N pushing and 528 N pulling (the pull force is lower because the 16 mm rod reduces the piston area on the return stroke). At the maximum operating pressure of 1.0 MPa, theoretical push force reaches 1280 N.
Only if you need the adjustable stroke feature. The SCJ40X80-20S has a longer body length (A=185 mm) than the fixed-stroke SC to house the adjusting screw. Mounting accessories from the SC series (Basic, FA, LB, TC) are compatible, but flange FB and clevis CA/CB are not available for SCJ.
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