Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20
The AirTAC SAIJ40X45-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 16mm SUS304 stainless steel rod for superior corrosion resistance. By turning the rear screw, you can trim the 45mm nominal stroke back by up to 20mm, creating a precise 25-45mm usable travel window for exact end-position tuning.
This adjustable stopper allows you to fine-tune the retract position at commissioning without swapping the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and fluid is supplied via PT G1/4 tapered ports. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 45 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 SAIJ40BX45-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×45 | 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 SAIJ40BX45-20 Is Used
Machine Changeover
Dial in the 25-45mm travel window during product size changes to set exact retract positions without replacing hardware.
End-Position Tuning
Fine-tune the final retract stop at commissioning to dial out mechanical slack or meet precise sensor targets.
Corrosive Environments
Leverage the SUS304 stainless steel rod for reliable actuation in packaging or food-grade areas prone to moisture.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-20 the Right Cylinder?
Choose this 40mm bore when you need 628N push force at 0.5 MPa, stepping up from a 32mm bore that provides 402N. The adjustable stroke is ideal for machine setups requiring variable end-stops or product-size changeovers, saving the effort of machining custom spacers compared to a fixed SAI cylinder. For a true dimensionally interchangeable ISO 15552 replacement, match the 40mm bore, 45mm stroke, 20mm adjustment, PT G1/4 port, and SUS304 (B) rod material. Note that this SKU does not include a magnet; add the -S suffix if you require CMSE reed or DMSE electronic sensors. Mounting options are limited to 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 SAIJ40BX45-20 FAQ
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 45mm nominal stroke by up to 20mm. This provides a usable travel window of 25-45mm for fine-tuning the end position at commissioning.
At 0.5 MPa operating pressure, the 40mm bore provides 628N of push force and 528N of pull force. It can deliver up to 1130N push force at 0.9 MPa.
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