Airtac SAIJ40 Adjustable Cylinder SAIJ40BX105-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX105-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 105mm 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
- Stroke105 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX105-20
The AirTAC SAIJ40X105-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 85-105 mm, allowing you to dial back the nominal 105 mm stroke by up to 20 mm during commissioning. In this B-rod configuration, the piston rod is crafted from SUS304 stainless steel, offering superior corrosion resistance for harsh environments.
Delivering 628 N of push force and 528 N of pull force at 0.5 MPa, it integrates a G1/4 PT port and a 12 mm rod thread. The extruded aluminum barrel includes sensor grooves on both sides, and the unit relies on variable air cushions at both ends to decelerate the load. The rear adjuster acts strictly as a travel stop, so it will not hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX105-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX105-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 105 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 SAIJ40BX105-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×105 | 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 SAIJ40BX105-20 Is Used
Machine Setup Tuning
Dial in the exact 85-105 mm end position during initial machine commissioning without machining new hard stops.
Product Changeover
Quickly adjust the stroke length on a packaging line when switching to a different product size.
Variable End Stops
Fine-tune the retract distance to accommodate varying material thicknesses in a clamping fixture.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX105-20 the Right Cylinder?
Choose this 40 mm bore when an application requires precise end-position tuning without swapping cylinders or adding external stops. If you need less force, the 32 mm bore provides 402 N of push at 0.5 MPa; if your load demands more, stepping up to the 50 mm bore yields 982 N. Because this is a 105 mm stroke, side-loading is less of a concern, but always ensure the load is guided on longer strokes. To replace an ISO 15552 cylinder, match the 40 mm bore, 105 mm stroke, 20 mm adjustment, G1/4 PT port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this non-magnet version omits the -S suffix, so position sensing via CMSE or DMSE electronic switches requires a magnet-equipped variant.
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 SAIJ40BX105-20 FAQ
The usable travel window is 85-105 mm, adjustable via the rear screw. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa.
No, the rear adjuster and air cushions only set and decelerate the travel end. To hold a load without live air pressure, use a SAIL lock, BSAI clamp-lock, or an external rod lock.
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