Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50 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 SAIJ40BX85-50
The AirTAC SAIJ40X85-50 is a double-acting ISO 15552 profile cylinder featuring a rear stopper screw that allows you to fine-tune the end position. It provides a usable travel window of 35 to 85 mm, letting you dial back the nominal stroke by up to 50 mm during commissioning. This bore delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it well-suited for medium-duty handling tasks.
This configuration uses a SUS304 stainless steel rod (option B) for superior corrosion resistance. It features PT tapered port threads and lacks a piston magnet. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on some standard variants.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50 |
|---|---|
| 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 SAIJ40BX85-50
| 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 SAIJ40BX85-50 Is Used
Machine Changeover
Quickly adjust the retract end-stop from 35 to 85 mm when switching product sizes on a packaging line, eliminating the need for external stopper hardware.
End-Position Tuning
Fine-tune the final resting position during commissioning to achieve precise alignment without physically remounting the actuator.
Variable End Stops
Set different stroke lengths on the fly for sorting or diverting items of varying widths along a conveyor belt.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50 the Right Cylinder?
Choose this 40 mm bore when your application requires around 628 N push force at 0.5 MPa, sitting neatly between the 32 mm bore (402 N) and the 50 mm bore (982 N). The 50 mm adjustment range is ideal for machine changeovers where product sizes vary, allowing you to reposition the retract end-stop without swapping the cylinder or adding external stops.
For ISO 15552 replacement, match the 40 mm bore, 85 mm stroke, PT G1/4 port, and the SUS304 rod material. Note that the rear adjuster acts only as a travel stop, not a lock; it will not hold the load without live air. For secure load-holding without pressure, consider an AirTAC SAIL or BSAI cylinder 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 SAIJ40BX85-50 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 85 mm nominal stroke by up to 50 mm, giving an adjustable travel window of 35 to 85 mm. It only sets the end position and does not lock the load.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40BX85-50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.