Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40
The AirTAC SAIJ125X45-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a usable travel window of 5 to 45 mm. Delivering 6136 N of push force at 0.5 MPa, it is designed for heavy-duty positioning tasks requiring exact end-stop tuning without external stops. The extruded aluminum barrel includes dual sensor grooves, allowing you to easily retrofit CMSE reed or DMSE electronic switches if position feedback is later required.
This model uses a robust 32 mm carbon steel rod with an M27x2 thread, paired with 40 mm air cushions at both ends to absorb kinetic energy. The PT tapered port threads ensure a tight pneumatic seal, while the rear stopper acts purely as a travel end-limit, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 45 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 SAIJ125X45-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | 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 SAIJ125 Adjustable Cylinder SAIJ125X45-40 Is Used
Product Changeovers
Dial in the 5 to 45 mm stroke window during format size changes on a packaging line without replacing the cylinder or adding external mechanical stops.
Heavy Clamping Setup
Leverage the 6136 N push force to secure dense workpieces, using the rear screw to fine-tune the clamping depth precisely at machine commissioning.
Variable End Stops
Adjust the retract position on the fly for automated assembly equipment, utilizing the 40 mm trim range to accommodate multiple part heights.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X45-40 the Right Cylinder?
Select this 125 mm bore cylinder when an application demands high thrust (6136 N at 0.5 MPa) alongside precise mechanical tuning. If your setup requires less force, stepping down to a 100 mm bore yields 3927 N of push force; stepping up to a 160 mm bore provides 10053 N. The 40 mm adjustment range is ideal for product-size changeovers, letting you dial in the exact 5-45 mm stroke on the fly instead of physically swapping cylinders. Because the stroke is under 300 mm, side-load risks are minimal, though the heavy 32 mm rod naturally handles greater bending loads than smaller bores.
For a direct ISO 15552 replacement, match the 125 mm bore, 45 mm nominal stroke, 40 mm adjustment code, PT port thread, and your required mounting bracket (choose from Basic, FA, LB, TC, FTC, TCM1, or TCM2). Note that this plain SAIJ variant lacks a magnet; if you need SAIL or BSAI variants for dead-end load holding without live air pressure, specify those separately, as this rear adjuster only sets the travel end.
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 SAIJ125X45-40 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf of push force.
The rear adjuster screw allows you to shorten the 45 mm nominal stroke by up to 40 mm, creating a usable travel window of 5 to 45 mm. This stopper only sets the end position and does not lock the load without live air pressure.
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