Airtac SAIJ40 Adjustable Cylinder SAIJ40AX85-20
The AirTAC SAIJ40 Adjustable Cylinder SAIJ40AX85-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 85mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ40 mm
- Stroke85 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX85-20
The AirTAC SAIJ40X85-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel back by up to 20 mm. This creates a precise 65-85 mm usable stroke window, giving you flexibility at commissioning without needing to swap the barrel or add external stops.
This specific configuration uses a SUS420J2 stainless steel rod (option A) for improved corrosion resistance over standard carbon steel. It features PT tapered port threads (G1/4) and lacks a standard piston magnet, meaning electronic position sensing is not factory-equipped. The rear adjuster acts purely as a mechanical travel stop to fine-tune the retract position, and it will not hold the load dynamically without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX85-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40AX85-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 85 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| 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, 30 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SAI series datasheet and ISO 15552 dimensions. Confirm against the product label before installation. Port options: G (BSPP) / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 528 N | 528 N |
| 0.7 MPa | 739 N | — |
| Max (@1.0 MPa) | 108 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40AX85-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×85 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related SAI-family variants: SAID (double rod), SAIJ (adjustable stroke), SAIL (with lock), SAIF (with valve), BSAI (enclasp / clamp-lock), and SAI-S with built-in magnet. Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B); seals: TPU (blank) / Viton H / NBR N.
Where the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX85-20 Is Used
Machine Setup Fine-Tuning
Dial in the exact 65-85 mm retract position during initial commissioning without machining custom spacers or swapping cylinders.
Product Size Changeover
Quickly adjust the end-stop to accommodate varying package lengths on a packaging line, utilizing the 20 mm adjustment window.
Variable End-Stop Positioning
Set precise retract distances for light-assembly tooling where the fixed stop point needs to adapt to different fixture heights.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40AX85-20 the Right Cylinder?
If your process demands less force, stepping down to a 32 mm bore yields 402 N; if you need significantly more push, stepping up to a 50 mm bore provides 982 N. The adjustable 65-85 mm travel window is perfect for product changeovers or setup fine-tuning, replacing the need for a fixed-stroke SAI cylinder when the exact end-stop distance varies slightly.
To match this cylinder for an ISO 15552 interchange, specify the 40 mm bore, 85 mm nominal stroke, 20 mm adjustment range, PT port threads, and no magnet. Mounting options are limited to the Basic, FA, LB, TC, FTC, TCM1, and TCM2 subsets (omitting FB, CA, CB, and CR). Because the stroke is under 300 mm, side-loading is less of a concern than on longer strokes, but the 16 mm rod and M12x1.25 thread still require standard alignment practices. Remember that the rear adjuster is a stop, not a lock; for true load-holding without live air, consider the SAIL or BSAI series instead.
Quick checklist
- ✓ Required force at your working pressure
- ✓ Stroke and mounting space
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
- ✓ Side load — consider a guided cylinder
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Avoid side load on the piston rod.
- check Adjust end cushion screws for smooth stops.
- check Use correct mounting accessory (FA/FB/CA/CB/LB/TC).
- check Installation by qualified personnel per AirTAC docs.
Airtac SAIJ40 Adjustable Cylinder SAIJ40AX85-20 FAQ
At 0.7 MPa, the push force increases to 879 N.
A rear mechanical screw stopper lets you shorten the 85 mm nominal stroke by up to 20 mm, creating a usable 65-85 mm travel window. This allows you to fine-tune the retract end-position at commissioning without adding external stops, though it acts only as a stop and does not lock the load without air pressure.
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