Airtac SCJ40 Standard Cylinder SCJ40X90-20S
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X90-20S 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, 90mm nominal stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Nominal stroke90 mm
- Stroke adjust-20 mm
- Port sizePT1/4
- Rod threadM12×1.25
- CushionAdjustable, 21 mm
About the Airtac SCJ40 Standard Cylinder SCJ40X90-20S
The AirTAC SCJ40X90-20S is a double-acting, single-rod pneumatic cylinder with a field-adjustable stroke end, delivering 628 N of push force at 0.5 MPa. Its rear-cap adjusting screw provides a 20 mm range to fine-tune the stroke end position, making it ideal for commissioning adjustments and format changeovers without swapping the cylinder. The built-in magnet allows direct mounting of CMSG/DMSG/EMSG sensors for reliable end-of-stroke detection.
With a 16 mm diameter piston rod and PT1/4 ports, this tie-rod cylinder is rated for operating pressures from 0.15 to 1.0 MPa and speeds of 30-800 mm/s. The body length (A dimension) is 185 mm, and the adjustable air cushion decelerates the piston smoothly at the end of travel. This genuine AirTAC unit is a practical choice for applications where the stroke length needs to be dialed in precisely on the machine.
Airtac SCJ40 Standard Cylinder SCJ40X90-20S Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X90-20S |
|---|---|
| Series | SCJ adjustable-stroke tie-rod cylinder |
| Bore size | Ø40 mm |
| Nominal stroke | 90 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 SCJ40X90-20S
| SCJ | Adjustable-stroke tie-rod cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×90 | 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 SCJ40X90-20S Is Used
Commissioning & Setup
The 20 mm adjustment range allows technicians to dial in the exact stroke end position during initial machine setup, compensating for minor variations in tooling or workpiece placement without needing to re-machine mounting brackets.
Wear Compensation
In applications like press-fitting or clamping, the stroke end can be adjusted over time to compensate for wear on contact surfaces, maintaining consistent process quality without replacing the cylinder.
Product Changeover
For packaging or sorting lines running different product sizes, the adjustable stroke allows operators to quickly change the stop position of a diverter gate or pusher arm, significantly reducing changeover time between batches.
Is the Airtac SCJ40 Standard Cylinder SCJ40X90-20S the Right Cylinder?
Choose this 40 mm bore SCJ when you need around 628 N of push force and the ability to tweak the stroke end by up to 20 mm in the field. If your force requirement is lower, the 32 mm bore SCJ provides 402 N of push force at 0.5 MPa. For higher force, the 50 mm bore offers a substantial jump to 982 N. If you do not need the adjustable stroke feature, the fixed-stroke SC series is a simpler, cost-effective alternative.
As a direct replacement, match this to another AirTAC SCJ adjustable-stroke cylinder with a 40 mm bore, 90 mm nominal stroke, and a -20 adjustment range. Ensure the replacement has the same PT port thread, basic mounting, and the -S magnet option for sensor compatibility. For strokes of 90 mm, the rod is well-supported, but always ensure the load is guided to prevent side-loading on the rod bearing.
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 SCJ40X90-20S FAQ
At the standard 0.5 MPa operating pressure, the push force is 628 N and the pull force is 528 N. The force is lower on the pull stroke because the 16 mm piston rod reduces the effective piston area. At the maximum operating pressure of 0.9 MPa, the push force reaches 1130 N.
Yes, if you need the added 20 mm of stroke-end adjustability. The SCJ40X90-20S shares the same mounting footprint and port size as a standard SC40, but the body is slightly longer to accommodate the adjusting screw mechanism. Ensure your application has the extra clearance for the longer body length.
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