Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30 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 SAIJ40BX850-30
The AirTAC SAIJ40X850-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 820 to 850 mm without adding external stops. Delivering 628 N of push force at 0.5 MPa, it uses a 16 mm SUS304 stainless steel rod with an M12x1.25 thread to handle moderate side loads. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches.
This model is configured with PT tapered port threads and omits the FB, CA, CB, and CR mounting options found on some standard variants, utilizing a focused set of Basic, FA, LB, TC, FTC, TCM1, and TCM2 accessories. The rear adjuster acts purely as a travel stop to set deceleration and end-positions, meaning it will not hold the load dynamically without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30 |
|---|---|
| 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 SAIJ40BX850-30
| 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 SAIJ40BX850-30 Is Used
Machine Changeovers
Dial in the 820-850 mm travel window during product size transitions to set exact end-stops without physically swapping cylinders.
End-Position Tuning
Fine-tune the retract end-position at commissioning using the rear screw, absorbing mechanical tolerances without external spacers.
Long-Stroke Assembly
Drive carriage mechanisms over a long travel distance while relying on the built-in air cushion and rear stopper for controlled deceleration.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-30 the Right Cylinder?
Choose this 40 mm bore when an application requires 628 N of push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) or down from a 63 mm bore (1559 N) to match your exact load requirements. An adjustable stroke is ideal for machine changeovers, allowing you to dial in the exact end-position at commissioning rather than swapping a fixed-stroke SAI cylinder.
Because the 850 mm stroke is relatively long, an external guide is recommended to prevent rod bending and premature seal wear. For applications requiring true load-holding without live air pressure, this cylinder is not a lock; consider the SAIL or BSAI series instead. This SKU maps to an ISO 15552 interchangeable replacement with a 40 mm bore, 850 mm stroke, 30 mm adjustment, PT port threads, and no magnet.
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 SAIJ40BX850-30 FAQ
It provides 628 N of push force and 528 N of pull force at 0.5 MPa, reaching up to 1130 N push at 0.9 MPa. The operating speed range is 30-800 mm/s, regulated by the G1/4 port and variable air cushions at both ends.
The rear adjuster lets you shorten the nominal 850 mm stroke by up to 30 mm, creating an effective 820-850 mm travel window. It functions as a mechanical stop for end-position tuning, not a lock, and does not hold the load without continuous air pressure.
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