Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40 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 a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke85 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40
The AirTAC SAIJ40X85-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 45 to 85 mm, allowing you to dial back the nominal 85 mm stroke by up to 40 mm during machine commissioning. In the 40 mm bore class, it generates 879 N of push force and 528 N of pull force at 0.7 MPa.
This variant uses a SUS304 stainless steel rod for superior corrosion resistance in washdown or chemically active environments. It features PT tapered port threads (G1/4) and relies on a variable air cushion at both ends to decelerate the load. Note that the rear adjuster acts only as a travel stop; it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40 |
|---|---|
| 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 | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40
| 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 SAIJ40BX85-40 Is Used
Machine Changeover
Quickly dial in the 45-85 mm travel window during product size transitions without disassembling tooling or adding external stops.
Variable End-Stop
Set the precise retract position for delicate picking and placing operations, using the 40 mm adjustment range to absorb mechanical tolerances.
Corrosive Assembly
The SUS304 stainless steel rod handles minor splashes and harsh factory atmospheres while providing stable actuation forces.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-40 the Right Cylinder?
Choose this 40 mm bore adjustable cylinder when your application requires fine end-position tuning without swapping out physical components. If you need higher force, stepping up to the 50 mm bore yields 1374 N of push force at 0.7 MPa, while dropping down to the 32 mm bore provides 563 N.
An adjustable stroke is ideal for product-size changeovers on a production line, acting as a variable end-stop rather than requiring a fixed-stroke SAI cylinder. Because the plain SAIJ design lacks a locking mechanism, you must maintain live air pressure to hold a load; for fail-safe holding, consider the SAIL or BSAI series. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX85-40 FAQ
At a 0.7 MPa operating pressure, this 40 mm bore cylinder provides 879 N of push force and 528 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster screw lets you shorten the 85 mm nominal stroke by up to 40 mm, creating a usable travel window of 45 to 85 mm. This allows fine-tuning of the end position at commissioning without changing the cylinder.
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