Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-40
The AirTAC SAIJ40X145-40 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 145 mm nominal stroke that can be dialed back by up to 40 mm, giving you a precise 105-145 mm usable travel window for fine-tuning end positions at commissioning. In the 40 mm bore class, it delivers 879 N of push force at 0.7 MPa and features a G1/4 port.
This variant incorporates a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to easily mount CMSE or DMSE sensors if a magnet is added later. The rear adjuster acts purely as a travel stop for deceleration, meaning it will not hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 145 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 SAIJ40BX145-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×145 | 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 SAIJ40BX145-40 Is Used
Product Changeover
Quickly dial in the 105-145 mm travel window during format changes on a packaging line without replacing the cylinder or adding external shims.
End-Position Tuning
Fine-tune the retract end-stop during machine commissioning to achieve exact positioning, compensating for mechanical tolerances on the fly.
Variable End Stops
Ideal for automated assembly equipment where the rear stopper must be adjusted periodically to accommodate different part sizes.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX145-40 the Right Cylinder?
Select this 40 mm bore cylinder when an application requires 879 N of push force at 0.7 MPa; step down to a 32 mm bore for 563 N, or up to a 50 mm bore for 1374 N. An adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops or on-the-fly product changeovers without swapping hardware. Because this is a 145 mm stroke, side-load is moderate, but always ensure proper external guiding for optimal seal life.
To match this exact ISO 15552 replacement, specify: 40 mm bore, 145 mm stroke, 40 mm adjustment range, PT port threads, SUS304 (B) rod material, and no magnet. Remember that the rear adjuster is a stop, not a lock—use an external rod lock or a SAIL cylinder if you need to hold a load without continuous air pressure. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX145-40 FAQ
It features a rear adjusting screw that acts as a mechanical stop, allowing you to trim the 145 mm nominal stroke back by up to 40 mm. This creates a usable travel window of 105-145 mm, which can be set during commissioning without changing the cylinder itself.
At 0.7 MPa operating pressure, the SAIJ40X145-40 generates 879 N of push force and 528 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
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