Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30S
The AirTAC SAIJ40X850-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of pull force at 0.5 MPa and features a built-in magnet for position sensing. The SUS304 stainless steel rod provides excellent corrosion resistance for demanding environments.
With a nominal 850mm stroke and a 30mm adjustment range, you can fine-tune the effective travel to anywhere within an 820-850mm window directly at commissioning. This eliminates the need to swap cylinders or bolt on external stops during product changeovers, while the extruded aluminum barrel retains standard ISO 15552 mounting dimensions.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 850 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 SAIJ40BX850-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×850 | 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 SAIJ40BX850-30S Is Used
Product Changeover
Dial in the 820-850mm travel window during format changes on packaging lines without swapping out the entire actuator.
End-Stop Tuning
Fine-tune the retract position precisely during machine commissioning to avoid costly mechanical hard stops.
Extended Reach Sorting
Use the long 850mm stroke with adjustable end-positioning to push varying product sizes off a conveyor belt.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30S the Right Cylinder?
Choose this 40mm bore when you need more force than a 32mm cylinder (345N pull at 0.5MPa) but want a smaller footprint than a 50mm option (825N pull). The adjustable 820-850mm travel window is perfect for applications requiring precise end-position tuning without external hardware. Because the stroke is 850mm, the 16mm rod needs external guidance to prevent excessive side-loading on the seals.
To match this ISO 15552 interchangeable cylinder, specify a 40mm bore, 850mm stroke, 30mm adjustment, PT tapered port thread, and the -S magnet for CMSE or DMSE sensors. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider an external rod lock or the AirTAC SAIL series.
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 SAIJ40BX850-30S FAQ
The rear adjuster screw allows you to shorten the effective travel by up to 30mm. This creates an adjustable 820-850mm window, letting you set the exact retract end-position at commissioning without adding external stops.
At 0.5 MPa operating pressure, it provides 628N of pull force and 879N of push force. It can reach a maximum push force of 1130N at 0.7 MPa.
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