Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75 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 SAIJ40BX85-75
The AirTAC SAIJ40X85-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 85 mm travel back by up to 75 mm. This creates a highly versatile 10-85 mm usable travel window, letting you dial in the exact end position during commissioning without swapping out the cylinder. It delivers 628 N of push force at 0.5 MPa and 879 N at 0.7 MPa, making it a solid choice for mid-range actuation.
This specific SKU is configured with a SUS304 stainless steel rod (code B) for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches. The rear adjuster functions purely as a mechanical stop to set the travel end and relies on the standard air cushions for deceleration; it does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75 |
|---|---|
| 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 SAIJ40BX85-75
| 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 SAIJ40BX85-75 Is Used
Machine Changeover
Quickly adapt the stroke length from 10 to 85 mm when switching product sizes on a packaging line, using the rear stopper instead of physically swapping cylinders.
Prototyping Setup
Fine-tune the exact end-position during equipment commissioning, allowing the 40 mm bore to deliver its 879 N thrust at exactly the right contact point.
Variable End-Stop
Use the 75 mm adjustment window to dial in the retract distance for delicate pressing or clamping tasks where the material thickness varies slightly between runs.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-75 the Right Cylinder?
Choose this 40 mm bore adjustable cylinder when your application requires variable end-stops or frequent product-size changeovers on a line. If you need slightly less force, stepping down to a 32 mm bore yields 402 N of push force at 0.5 MPa. If your setup demands higher thrust, moving up to a 50 mm bore provides 982 N. Because this model features a generous 75 mm adjustment range on an 85 mm stroke, it is particularly useful for prototyping or machinery where the exact stopping distance is determined empirically at startup.
When replacing an ISO 15552 cylinder, match these exact attributes: 40 mm bore, 85 mm stroke, 75 mm adjustment, PT G1/4 ports, and the SAIJ mounting subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the SAIJ series omits the FB, CA, CB, and CR mounts. If your process requires the load to be held in place without continuous air pressure, this cylinder is not a lock; you should consider the AirTAC SAIL (pneumatic lock) or BSAI (clamp-lock) 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 SAIJ40BX85-75 FAQ
At a 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. If you increase the pressure to 0.7 MPa, the push force rises to 879 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 85 mm nominal stroke by up to 75 mm, creating a usable travel window of 10 to 85 mm. It sets the end position and relies on the air cushions for deceleration, but it does not lock the load without live air pressure.
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