Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50 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 SAIJ40BX325-50
The AirTAC SAIJ40X325-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the effective travel. With a nominal 325 mm stroke and a 50 mm adjustment range, it provides a usable 275-325 mm travel window for precise commissioning without adding external stops. It delivers a robust 879 N push force at 0.7 MPa, making it well-suited for moderate-load positioning tasks.
This variant is configured with a SUS304 stainless steel rod (option B) for superior corrosion resistance in demanding environments. It uses PT tapered port threads and operates at speeds of 30-800 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to directly mount CMSE reed or DMSE electronic solid-state switches if needed. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50 |
|---|---|
| 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 SAIJ40BX325-50
| 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 SAIJ40BX325-50 Is Used
Machine Changeover
Quickly dial in the 275-325 mm travel window during product size changes on a packaging line, eliminating the need to physically swap out cylinders for different formats.
End-Position Tuning
Fine-tune the exact retract stop during commissioning to perfect a pressing or clamping operation, absorbing mechanical tolerances without adding external stopper blocks.
Variable Stops
Adjust the rear screw to set custom reject positions on a conveyor diverter, providing flexible routing logic without modifying the machine's core framework.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-50 the Right Cylinder?
Choose this 40 mm bore cylinder when your application requires 879 N of push force at 0.7 MPa and a highly adjustable end-position. The 50 mm rear adjuster is perfect for machine changeovers, letting you dial in the exact stroke without swapping the cylinder. If you need less force, a 32 mm bore provides 563 N; if you need more, a 50 mm bore offers 1374 N. Because the 325 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the 16 mm rod and M12x1.25 rod thread.
The rear adjuster and the variable air cushions at both ends only decelerate the travel end; they do not hold the load without live air. For true fail-safe load holding, select a SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead. This model is dimensionally interchangeable per ISO 15552, featuring a PT port, SUS304 rod, and no standard magnet.
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 SAIJ40BX325-50 FAQ
This 40 mm bore cylinder provides 628 N of push force and 528 N of pull force at 0.5 MPa. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 325 mm nominal stroke by up to 50 mm. This creates a usable travel window of 275-325 mm. Note that this stopper only sets the end position; it does not lock the load without live air pressure.
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