Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40S 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 SAIJ40BX850-40S
The AirTAC SAIJ40X850-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 850 mm stroke that can be fine-tuned backward by up to 40 mm, yielding an effective travel window of 810 to 850 mm. Delivering 879 N of push force at 0.7 MPa, it is tailored for long-travel tasks requiring exact end-position calibration. This variant features a SUS304 stainless steel rod (code B) for corrosion resistance and includes a magnet for CMSE reed and DMSE electronic sensors.
Instead of fabricating external stopper blocks to dial in a long travel distance, mechanics can simply turn the rear adjusting screw during commissioning. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Note that the adjuster acts purely as a travel stop alongside the standard air cushions; it does not lock the load, so a SAIL or BSAI cylinder is required for position holding without live air.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40S |
|---|---|
| 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 SAIJ40BX850-40S
| 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 SAIJ40BX850-40S Is Used
Product Changeover
Dial in the 810 to 850 mm travel window via the rear screw to accommodate different package lengths on a packaging line without changing hardware.
Long-Travel Sorting
Pushes items across a wide conveyor belt, using the adjustable end-stop to precisely set the final position based on the sorting bin size.
Machine Commissioning
Fine-tune the exact retracted end position during initial machine setup, absorbing mechanical tolerances over the 850 mm stroke without adding external stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-40S the Right Cylinder?
Select this 40 mm bore unit when an application demands 628 N of push force at 0.5 MPa alongside a highly specific long travel distance. If you need more thrust, stepping up to the 50 mm bore yields 982 N at 0.5 MPa, while dropping to the 32 mm bore provides 402 N. The adjustable stroke is chosen over a fixed SAI cylinder when you need to trim the end position for product changeovers without physically swapping the cylinder. Because the stroke is 850 mm, an external guide rail is strongly recommended to prevent excessive side-loading on the 16 mm rod.
For a true ISO 15552 replacement match, verify the 40 mm bore, 850 mm stroke, up to 40 mm adjustment range, PT tapered port threads, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Operating speed spans 30 to 800 mm/s.
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 SAIJ40BX850-40S FAQ
At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the 850 mm nominal stroke by up to 40 mm, creating a usable travel window of 810 to 850 mm. It functions as a stop, not a lock, so the load is only held while live air pressure is applied.
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