Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-100 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 SAIJ40BX850-100
The AirTAC SAIJ40X850-100 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 dialed back by up to 100 mm, yielding a usable travel window of 750-850 mm for precise end-position tuning at commissioning. Delivering 879 N of push force at 0.7 MPa, it features a SUS304 stainless steel rod for superior corrosion resistance and operates at speeds of 30-800 mm/s.
This extruded aluminum profile cylinder includes sensor grooves on both sides for flexible switch mounting. The rear screw acts purely as a travel stop to decelerate the piston alongside the standard air cushions, meaning it cannot hold a load without live air pressure. It supports a dedicated mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-100 |
|---|---|
| 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 SAIJ40BX850-100
| 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 SAIJ40BX850-100 Is Used
Machine Changeover
Dial in the 750-850 mm travel window during product size changes to set new end positions without physically swapping out the actuator.
End-Position Tuning
Fine-tune the retract stroke at commissioning using the rear adjuster to absorb mechanical tolerances and achieve exact positioning.
Variable Stops
Provide adjustable physical stops for long-stroke material handling tasks where the required travel distance varies between production runs.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX850-100 the Right Cylinder?
Choose this 40 mm bore cylinder when an application requires 879 N push force at 0.7 MPa with variable end-stops, stepping up from a 32 mm bore (563 N) or down from a 63 mm bore (2182 N). The 100 mm adjustment window is ideal for product changeovers, allowing you to fine-tune the 850 mm travel without swapping the cylinder or adding external stops. Because the stroke is 850 mm, an external guide is recommended to prevent excessive side-loading on the rod.
For a direct ISO 15552 replacement, match the 40 mm bore, 850 mm stroke, 100 mm adjustment, PT tapered port threads, and the specified mounting hardware. Note that this configuration uses a SUS304 stainless steel rod and lacks a magnet, so position sensing is not supported without adding an -S variant. If true load-holding is required without continuous air pressure, consider the SAIL or BSAI series instead of relying on the rear stopper.
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 SAIJ40BX850-100 FAQ
The rear adjuster allows you to shorten the effective travel by up to 100 mm, creating a usable stroke window of 750-850 mm. It acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
At an operating pressure of 0.7 MPa, the SAIJ40X850-100 provides 879 N of push force and 739 N of pull force. It can deliver up to 1130 N push force at 0.9 MPa.
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