Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 155mm 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
- Stroke155 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75
The AirTAC SAIJ125X155-75 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a substantial 6136N pull force at 0.5 MPa and features a usable travel window of 80-155mm, letting you shorten the effective stroke by up to 75mm during machine commissioning. The carbon steel piston rod utilizes an M27x2 thread, while fluid is supplied via a PT tapered G1/2 port.
This adjustable-stroke design eliminates the need to swap cylinders or add external stops when tuning end positions. The extruded aluminum barrel includes dual sensor grooves for CMSE reed or DMSE solid-state switches. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles found on some fixed-stroke variants.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 155 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 SAIJ125X155-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×155 | 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 SAIJ125X155-75 Is Used
Press Stroke Tuning
Dial in the exact 80-155mm pressing distance during setup without disassembling the tooling or changing the cylinder.
Product Changeover
Quickly adapt the end-of-stroke position on a production line when switching to a different product size.
Variable End Stops
Set a precise retract position for a heavy fixture, leveraging the 6136N pull force at 0.5 MPa.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X155-75 the Right Cylinder?
Select this 125mm bore when a smaller 100mm bore falls short of the required thrust, as the step up from 100mm increases the 0.5 MPa pull force from 3681N to 5734N. The 75mm adjustment range is chosen for applications needing a wide variable end-stop, unlike a fixed SAI cylinder which locks you into a single 155mm travel. For any load-holding requirements without live air pressure, use a SAIL or BSAI cylinder, as the rear adjuster here is only a travel stop.
When specifying an ISO 15552 replacement, match the 125mm bore, 155mm nominal stroke, 75mm adjustment, PT G1/2 port, and the desired mounting and magnet options. The standard speed range is 30-500mm/s. Because this unit features a 155mm stroke, side-load is minimal, but the robust 32mm rod still handles standard guide loads effectively.
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 SAIJ125X155-75 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster acts as an external stopper that lets you trim the effective stroke back by up to 75mm. This creates a usable travel window of 80-155mm, allowing fine-tuning of the retract end position without replacing the cylinder.
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