Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50S
The AirTAC SAIJ40X800-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 800 mm stroke that can be fine-tuned backward by up to 50 mm, yielding a usable travel window of 750-800 mm. This built-in adjustability allows you to dial in the exact retract end-position during commissioning without swapping out the cylinder or adding external stops. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and includes a magnetic piston for position sensing.
This model features a tapered PT port thread and operates at speeds between 30-800 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, seamlessly accepting AirTAC CMSE reed and DMSE electronic solid-state switches. The rear adjuster functions purely as a mechanical stop to set the travel end and relies on the integrated air cushions for deceleration; it does not lock or hold the load without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 800 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 SAIJ40BX800-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×800 | 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 SAIJ40BX800-50S Is Used
Variable Length Push-off
Dial in the exact 750-800 mm retract position to push varying carton widths off a conveyor without changing out the entire actuator assembly.
Machine Changeover
Quickly fine-tune the end-stop during product family transitions on the line, using the 50 mm adjustment window to set new datum points rapidly.
Long-Travel Forming Stop
Use the rear stopper to precisely set the retract position for a long-travel forming or press operation, relying on the SUS304 rod in mildly corrosive environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX800-50S the Right Cylinder?
Choose this SAIJ40X800-50-S when an application requires precise end-stop tuning over a long 800 mm travel, such as varying product sizes on a conveyor line. If your setup needs less push force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa. Conversely, stepping up to a 50 mm bore provides 982 N for heavier payloads. Because this cylinder features an 800 mm stroke, the unsupported piston rod is highly susceptible to side-loading and bending; an external guide rail is strongly recommended to prevent premature seal wear and rod damage.
The adjustable rear stop is ideal for machine changeovers, letting you trim the stroke by up to 50 mm on the fly instead of installing a fixed-stroke SAI cylinder. Remember that the rear adjuster and air cushions only set the travel end and do not function as a brake; for true load-holding without live air pressure, select an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder. This SAIJ configuration is dimensionally interchangeable per ISO 15552, uses a PT port, and supports the Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounting set.
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 SAIJ40BX800-50S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 128 kgf.
The rear adjuster screw allows you to shorten the effective stroke by up to 50 mm from the 800 mm nominal length, creating a 750-800 mm travel window. It acts as a mechanical stop to fine-tune the end position at commissioning but does not hold the load without live air pressure.
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