Airtac SCJ40 Standard Cylinder SCJ40X90-20
The AirTAC Airtac SCJ40 Standard Cylinder SCJ40X90-20 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 SCJ40X90-20
The AirTAC SCJ40X90-20 is a double-acting, single-rod adjustable-stroke cylinder that lets you fine-tune the stroke end position by up to 20 mm via a rear-cap screw. With a 40 mm bore and 16 mm rod, it delivers 628 N of push force at 0.5 MPa, making it a versatile actuator for applications where the final stop needs to be dialed in during commissioning or after tooling wear.
The body length A is 185 mm, and it uses PT1/4 ports with an M12x1.25 rod thread. Its adjustable cushioning helps manage end-of-stroke impact, and the maximum standard stroke for this bore is 1200 mm, so the 90 mm stroke is well within the standard range.
Airtac SCJ40 Standard Cylinder SCJ40X90-20 Technical Specifications
| Model | Airtac SCJ40 Standard Cylinder SCJ40X90-20 |
|---|---|
| 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 SCJ40X90-20
| 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 SCJ40X90-20 Is Used
Commissioning & Setup
Dial in the exact stopping position during machine build without needing to shim or reposition the cylinder body.
Format Changeovers
Quickly adjust the stroke end for different product sizes on a packaging or sorting line, reducing downtime between batches.
Wear Compensation
Take up mechanical play or tooling wear over time by advancing the screw, maintaining consistent part contact.
Is the Airtac SCJ40 Standard Cylinder SCJ40X90-20 the Right Cylinder?
Choose the SCJ40X90-20 when you need to fine-tune the stroke end without swapping cylinders or adding external hard stops. If you require 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 adjustment, the standard SC40X90 fixed-stroke cylinder is a simpler, more cost-effective alternative. To replace this unit, match the 40 mm bore, 90 mm nominal stroke, 20 mm adjust range, PT ports, and basic mounting.
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 SCJ40X90-20 FAQ
At 0.5 MPa, the push force is 628 N and the pull force is 528 N due to the 16 mm rod reducing the piston area on the return stroke. The maximum push force at 0.9 MPa is 1130 N.
A screw in the rear cap sets the stroke end position within a 20 mm range. The 90 mm in the code is the nominal maximum stroke; the screw can shorten it to as little as 70 mm.
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