Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 35mm 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
- Stroke35 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20
The AirTAC SAIJ40X35-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 15 to 35 mm, allowing you to fine-tune the retract end position by up to 20 mm without adding external stops. Built with a SUS304 stainless steel rod (option B) and PT tapered ports, it delivers 628N of push thrust at 0.5 MPa.
This adjustable-stroke model shares the exact extruded aluminum barrel and mounting footprint of the standard SAI series. The rear adjuster acts purely as a mechanical stop to set the travel limit, meaning it will not hold the load without live air pressure. For position-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 35 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 SAIJ40BX35-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×35 | 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 SAIJ40BX35-20 Is Used
Machine Setup
Dial in the exact end position during initial commissioning without machining custom spacers or swapping cylinders.
Product Changeover
Quickly adapt the 15-35mm travel window on automated lines when handling slightly different product sizes.
Variable End Stops
Achieve precise retract limits for repetitive assembly tasks using the integrated rear adjustment screw.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX35-20 the Right Cylinder?
Choose this 40mm bore when you need slightly more force than the 32mm version (which provides 402N at 0.5 MPa) but want to keep the physical footprint compact. The adjustable stroke is highly beneficial during machine commissioning or product changeover, letting you dial in the exact 15-35mm travel on the fly rather than swapping out a fixed-stroke SAI cylinder.
When specifying this model, note that it uses PT tapered ports and omits the FB, CA, CB, and CR mounting accessories, supporting only the Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounting set. As with all pneumatic cylinders, the rear adjuster and variable air cushions manage deceleration but do not function as a lock.
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 SAIJ40BX35-20 FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw allows you to shorten the nominal 35mm stroke by up to 20mm, creating a usable travel window of 15 to 35mm. This lets you fine-tune the end position at commissioning without replacing the cylinder.
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