Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20 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 SAIJ125AX155-20
The AirTAC SAIJ125X155-20 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. It provides a usable travel window of 135 to 155 mm, allowing you to dial back the nominal 155 mm stroke by up to 20 mm during machine setup or product changeover. Delivering a robust 6136 N of push force at 0.5 MPa, it handles heavy actuation tasks with precision.
This model features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and the rear stopper functions purely as a travel end deceleration device rather than a load-holding lock. For applications requiring position retention without live air pressure, an external pilot-operated check valve or an AirTAC SAIL locking cylinder is necessary.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20 |
|---|---|
| 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 SAIJ125AX155-20
| 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 SAIJ125AX155-20 Is Used
Product Changeover
Dial in the 135-155 mm travel window on the rear adjuster to accommodate different package sizes on a packaging line without swapping out the entire cylinder assembly.
Commissioning Tuning
Fine-tune the end-of-stroke position during machine setup to perfectly time a heavy press operation, absorbing kinetic energy with the 40 mm cushion stroke.
Heavy Load Actuation
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or tooling, relying on the 32 mm rod to withstand high side loads during transit.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20 the Right Cylinder?
Choose this 125 mm bore when your application requires significant thrust—6136 N at 0.5 MPa or up to 1251 kgf at the 1.0 MPa maximum. If your process demands less force, stepping down to a 100 mm bore yields 3927 N at 0.5 MPa, which saves physical space and air consumption. The SAIJ adjustable design is selected over a fixed-stroke SAI cylinder when you need variable end-stops for product size changes, allowing fine-tuning at commissioning without adding bulky external stops.
When specifying this ISO 15552 interchangeable replacement, confirm the 155 mm stroke, 20 mm adjustment range, PT G1/2 port, and the reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2—omitting FB, CA, CB, CR). Because this unit lacks the -S magnet option, it cannot host 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 SAIJ125AX155-20 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 can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective travel from the 155 mm nominal stroke down to 135 mm. It only sets the deceleration end-point and does not lock the load without live air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125AX155-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.