Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 105mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ125 mm
- Stroke105 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40
The AirTAC SAIJ125X105-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a robust 6136N push force at 0.5MPa and uses a 32mm carbon steel rod with M27x2 threading. By turning the rear stopper screw, you can trim the effective travel down by up to 40mm, creating a precise 65-105mm usable stroke window without needing external stops.
This model is built with PT tapered ports and operates at speeds of 30-500mm/s. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. If you require load-holding without live air pressure, note that the rear adjuster functions strictly as a travel stop, not a brake, and you should look toward the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 105 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M27×2 |
| 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 – 500 mm/s |
| Cushion | Adjustable, 40 mm |
| Max stroke | Up to 1500 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 (Ø125mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 6136 N | 5734 N |
| 0.7 MPa | 8590 N | — |
| Max (@1.0 MPa) | 1251 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | 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 SAIJ125 Adjustable Cylinder SAIJ125X105-40 Is Used
Variable End-Stop Positioning
Dial in the exact retraction point within the 65-105mm window to accommodate different material thicknesses without physically remounting the cylinder.
Machine Commissioning Tuning
Fine-tune the final end position during initial setup to prevent mechanical interference, using the rear screw rather than adding external spacers.
Product Size Changeover
Quickly adjust the stroke length by up to 40mm on packaging lines when switching between different product dimensions.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X105-40 the Right Cylinder?
Select this 125mm bore cylinder when a 100mm bore (providing 3927N push at 0.5MPa) lacks the necessary thrust, but you also need the flexibility to dial in the exact end position during machine commissioning. The adjustable 65-105mm travel window is ideal for product changeovers, whereas a fixed-stroke SAI cylinder would require physical shimming or swapping to achieve different end stops.
To match this exact configuration for an ISO 15552 replacement, verify the 125mm bore, 105mm nominal stroke, 40mm adjustment range, PT port threads, and standard carbon steel rod. Mounting options are limited to the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Since this SKU lacks the -S magnet option, it will not work with AirTAC CMSE reed or DMSE electronic sensors without modification.
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 SAIJ125 Adjustable Cylinder SAIJ125X105-40 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides a push force of 6136N and a pull force of 5734N. At its maximum 1.0 MPa pressure, it can deliver up to 1251 kgf of push force.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 105mm nominal stroke by up to 40mm, resulting in a usable travel range of 65 to 105mm. It only sets the travel end and does not lock or hold the load without continuous air pressure.
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