Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50S
The AirTAC SAIJ40X325-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 275-325 mm, allowing you to dial back the 325 mm nominal stroke by up to 50 mm during machine commissioning. Delivering 628 N of push force at 0.5 MPa, it suits medium-duty tasks. The extruded aluminum barrel integrates sensor grooves on both sides for flexible switch mounting.
This variant uses a SUS304 stainless steel rod (code B) for superior corrosion resistance. It includes a magnet for position detection, supporting AirTAC CMSE reed and DMSE solid-state sensors. The rear adjustment screw acts purely as a travel stop to fine-tune end positions without adding external physical stops.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 325 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 SAIJ40BX325-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×325 | 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 SAIJ40BX325-50S Is Used
Machine Commissioning
Dial in the exact end-stop during setup. The 50 mm adjustment window lets operators fine-tune the 325 mm stroke without machining external stopper blocks.
Product Changeover
Adjust the retract position on packaging lines when product sizes change. The rear screw allows quick travel modifications to handle varying package lengths.
Corrosive Environments
The SUS304 stainless steel rod withstands moisture and washdowns, making it suitable for food processing or light chemical handling tasks.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50S the Right Cylinder?
Choose this 40 mm bore when an application requires precise end-position tuning without swapping cylinders; it delivers 628 N push and 528 N pull at 0.5 MPa. If you need higher force, stepping up to the 50 mm bore yields 982 N. The adjustable stroke is ideal for product changeovers where the exact end-of-stroke varies by up to 50 mm.
Because the total stroke is 325 mm, an external guide is recommended to prevent excessive side-loading on the 16 mm rod and M12x1.25 thread. The SAIJ mounting set omits FB, CA, CB, and CR brackets, offering Basic, FA, LB, TC, FTC, TCM1, and TCM2 options. This cylinder uses PT tapered ports (G1/4). Note that the rear adjuster is a stop, not a lock; for load-holding without live air pressure, select an SAIL or BSAI cylinder.
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 SAIJ40BX325-50S FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N push force at 0.9 MPa.
The rear adjuster screw lets you shorten the effective stroke from 325 mm down to 275 mm. It acts as a mechanical stop to fine-tune the end position, but it does not lock or hold the load without continuous air pressure.
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