Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-75
The AirTAC SAIJ40X350-75 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 350 mm stroke that can be fine-tuned backward by up to 75 mm, creating a precise 275-350 mm usable travel window. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads.
This model utilizes an extruded aluminum barrel with sensor grooves on both sides, accepting CMSE reed or DMSE electronic solid-state switches if a magnet is specified later. The rear adjuster acts purely as a mechanical stop to set the retraction end position during commissioning, while the standard air cushions handle deceleration. It supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 350 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 SAIJ40BX350-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×350 | 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 SAIJ40BX350-75 Is Used
Product Changeovers
Dial in the 275-350 mm travel window during line format changes to accommodate different package sizes without mechanical rebuilds.
End-Position Tuning
Fine-tune the exact retraction point at machine commissioning to perfect tooling alignment, avoiding the need to shim a fixed-stroke SAI cylinder.
Variable Stops
Act as an adjustable diverter or stop gate on a conveyor where the exact stopping distance needs occasional field adjustment.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX350-75 the Right Cylinder?
Choose this 40 mm bore when you need 628 N push force at 0.5 MPa, stepping down from a 50 mm bore (982 N) if your payload is lighter, or up from a 32 mm bore (402 N) when more thrust is required. The 75 mm adjustment range is ideal for product changeovers, allowing you to shift the end-stop without swapping the cylinder or adding external stops. To replace an ISO 15552 cylinder, match the 40 mm bore, 350 mm stroke, PT ports, and the chosen mounting hardware.
Because the stroke is 350 mm, the 16 mm rod and M12x1.25 rod thread will experience amplified side loads if the load is unsupported; an external guide rail is recommended to prevent binding. Remember that the rear adjuster is a travel stop, not a lock; the SAIJ cannot hold a load without live air pressure, so specify a SAIL or BSAI cylinder if true mechanical locking is required.
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 SAIJ40BX350-75 FAQ
It features a rear mechanical stopper that allows you to shorten the effective stroke by up to 75 mm. This provides a usable travel window of 275 to 350 mm, letting you set the exact end position without changing the cylinder.
At 0.5 MPa operating pressure, it generates 628 N of push force and 528 N of pull force. At a maximum 1.0 MPa, the push force increases to 1130 N.
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