Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40
The AirTAC SAIJ125X135-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and uses a PT tapered G1/2 port. The integrated rear stopper screw allows you to trim the nominal 135mm travel back by up to 40mm, creating a precise 95-135mm usable stroke window for product changeovers.
This model features a carbon steel piston rod and a 32mm rod thread, providing high rigidity against side loads. It uses variable air cushions at both ends to decelerate the moving mass, but the rear adjuster acts only as a travel stop, not a lock. For applications requiring position holding without live air pressure, you must use a related type like the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125X135-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125X135-40 Is Used
Variable End-Stop Tuning
Dial in the exact retract distance from 95 to 135mm during machine setup to accommodate different material thicknesses without changing the cylinder.
Product Changeover Lines
Quickly readjust the rear stopper screw on automated lines when switching between product sizes, saving downtime on mechanical modifications.
High-Force Positioning
Leverage the 6136N thrust at 0.5MPa to push heavy workpieces into a precise end-position while using the 40mm adjustment window for final calibration.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X135-40 the Right Cylinder?
Choose this 125mm bore when a 100mm bore (offering 3927N push at 0.5MPa) lacks the thrust to move your load, but you want to avoid stepping up to a 160mm bore. The 40mm adjustment range lets you fine-tune the retract end-position at commissioning without physically swapping the cylinder or machining external stopper blocks, which is highly beneficial on machines processing varying product sizes.
When replacing an ISO 15552 cylinder, match the 125mm bore, 135mm stroke, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the nominal stroke is under 300mm, external side-load guides are less critical than on longer strokes, but the heavy 125mm mass still benefits from the robust 32mm rod thread. Note that without a -S magnet option specified, this unit cannot host CMSE or DMSE sensors.
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 SAIJ125X135-40 FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the 135mm nominal stroke by up to 40mm, providing a usable travel window of 95-135mm. It only sets the end position and does not lock the load without live air.
At a 0.5MPa operating pressure, it provides 6136N of push force and 5734N of pull force. The maximum thrust is 1251kgf at 1.0MPa.
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