Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-30
The AirTAC SAIJ125X150-30 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. By integrating a 30mm adjustment mechanism, this unit enables a usable travel window between 120 and 150mm, allowing technicians to dial in the exact retract end-position during commissioning. It features a carbon steel piston rod and PT tapered port threads.
Because the adjuster functions strictly as a mechanical stop to set the travel limit, it does not hold the load without live air pressure. For load-holding requirements without continuous pneumatic supply, an external rod lock or related AirTAC types like SAIL or BSAI are required. This cylinder uses an extruded aluminum barrel with sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE electronic sensors when a magnet is specified.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125X150-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SAIJ125X150-30 Is Used
Product Changeovers
Quickly adapt machinery for varying product sizes by dialing the rear adjuster to shift the 120-150mm travel window, avoiding complete cylinder replacement.
End-Position Tuning
Fine-tune the retract stroke during initial machine commissioning to achieve precise mechanical stops without adding external bumpers.
Heavy-Duty Forming
Leverage the 6136N push force at 0.5 MPa for pressing or forming tasks that require both high power and adjustable travel limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-30 the Right Cylinder?
Selecting this 125mm bore cylinder makes sense when an application requires substantial thrust—such as 6136N push or 5734N pull at 0.5 MPa—but still demands exact end-position tuning. If a smaller force class is acceptable, stepping down to a 100mm bore provides 3927N push force, whereas moving up to a 160mm bore yields 10053N. The adjustable stroke is specifically valuable for product changeovers on a line, as it eliminates the need to physically swap cylinders or bolt on external stoppers to achieve a 120-150mm travel window.
When replacing an ISO 15552 cylinder, verify the 125mm bore, 150mm nominal stroke, 30mm adjustment range, PT port threads, and the lack of a magnet. Mounting options for this SAIJ series include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Since the 150mm stroke is relatively short for this large bore, side-load stress is minimal, but the 32mm rod diameter still requires proper alignment to prevent premature seal wear.
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 SAIJ125X150-30 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 a mechanical stop that lets you shorten the 150mm nominal stroke by up to 30mm, creating a usable travel window of 120-150mm. It only sets the travel end and does not lock or hold the load without live air pressure.
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