Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20S 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 SAIJ40BX325-20S
The AirTAC SAIJ40X325-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force and 528N of pull force at 0.5 MPa, utilizing a 16mm piston rod. The integrated -20 mm adjustment screw allows you to fine-tune the effective travel within a 305-325 mm window, providing precise end-position calibration without needing external stops.
This variant features a SUS304 stainless steel rod (code B) for superior corrosion resistance and includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic sensors. It uses a PT G1/4 port and achieves speeds of 30-800 mm/s. Because the stroke exceeds 300 mm, the unsupported load should be guided externally to prevent side-load wear on the rod seals.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20S |
|---|---|
| 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 SAIJ40BX325-20S
| 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 SAIJ40BX325-20S Is Used
Product Changeover
Dial in the 305-325mm travel window during format changes on packaging lines, avoiding the need to physically swap cylinders for different package sizes.
Machine Setup
Fine-tune the retract end-position at commissioning to perfectly seat parts, using the rear stopper to dial out mechanical lash without adding external hard stops.
Variable End Stops
Accommodate varying material lengths on a conveyor by adjusting the stroke by up to 20mm, ensuring precise positioning without reprogramming the motion controller.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20S the Right Cylinder?
Select this 40mm bore when an application requires moderate force (628N push at 0.5 MPa) but demands exact end-position tuning during commissioning or product changeovers. If your setup requires less force, stepping down to a 32mm bore yields 402N; if you need significantly more thrust, a 50mm bore provides 982N. The adjustable rear stopper acts solely as a travel limit and does not hold the load without live air—use an AirTAC SAIL or BSAI cylinder for pneumatic locking. To replace an ISO 15552 cylinder, match the 40mm bore, 325mm stroke, -20mm adjustment, PT G1/4 port, and -S magnet, ensuring your mounting choice falls within the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, 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 SAIJ40BX325-20S FAQ
The rear adjuster screw allows you to shorten the nominal 325mm stroke by up to 20mm, creating a usable travel window of 305-325mm. This stopper sets the retract end position but does not lock the load without continuous air pressure.
At 0.5 MPa, the SAIJ40X325-20-S generates 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40BX325-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.