Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-30S
The AirTAC SAIJ125X125-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 95-125 mm, allowing you to dial back the nominal 125 mm stroke by up to 30 mm during machine commissioning. Delivering 6136 N push force at 0.5 MPa, it handles heavy loads. The extruded aluminum barrel includes sensor grooves on both sides, and the -S magnet supports AirTAC CMSE reed and DMSE solid-state switches for precise position feedback.
This model uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance. It features PT tapered port threads (G1/2) and operates at speeds of 30-500 mm/s. The rear adjuster acts purely as a travel stop for end-position tuning; it does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125AX125-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125AX125-30S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 95-125 mm window during machine setup, avoiding the need to physically swap out the entire cylinder for minor position changes.
Product Size Changeover
Quickly adapt automated line tooling to accommodate different product lengths by adjusting the rear stopper screw on the fly during production transitions.
Heavy-Duty Forming Tuning
Leverage the 6136 N push force at 0.5 MPa for pressing or forming tasks, using the 30 mm adjustment to fine-tune the end position without re-engineering the fixture.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX125-30S the Right Cylinder?
Select this 125 mm bore when an application requires high thrust (6136 N at 0.5 MPa) alongside variable end-stop positioning. The adjustable stroke is ideal for product changeovers on a line, letting you fine-tune the retract position without swapping cylinders or adding external stops. If your force requirements are lower, stepping down to the 100 mm bore yields 3927 N push force at 0.5 MPa.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 125 mm stroke, 30 mm adjustment, PT port threads, and -S magnet. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2—omitting FB, CA, CB, and CR. Because the stroke is under 300 mm, side-load risks are moderate, but an external guide is still recommended for heavy lateral loads.
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 SAIJ125AX125-30S FAQ
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At the maximum operating pressure of 1.0 MPa, the maximum push force is 1251 kgf.
The rear adjuster screw allows you to shorten the effective travel from the nominal 125 mm down to 95 mm. This creates a 95-125 mm adjustable window for fine-tuning the retract end position at commissioning. The adjuster is a stop, not a lock, and requires live air to hold the load.
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