Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50
The AirTAC SAIJ125X425-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, allowing you to fine-tune the travel window from 375 to 425 mm without swapping the barrel. Built with a SUS420J2 stainless steel rod (code A) and PT tapered port threads, it delivers a robust 6136 N push force at 0.5 MPa. This makes it highly effective for heavy machinery requiring precise end-position calibration during commissioning or product changeover.
The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches if a magnet is added later. It uses a reduced mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. The rear screw acts purely as a travel stop to set deceleration limits and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125AX425-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125AX425-50 Is Used
Product Changeover
Dial in the 375-425 mm travel window during line changeovers to accommodate different product sizes without physically replacing the cylinder.
End-Stop Calibration
Fine-tune the final retract position at commissioning using the rear screw, avoiding the need to bolt on external stops or shims.
Heavy Pressing
Leverage the 6136 N push force at 0.5 MPa for heavy-duty pressing and forming tasks that require exact end-position tuning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX425-50 the Right Cylinder?
Choose this 125 mm bore over the smaller 100 mm version when you need more power, as the step up increases push force from 3927 N to 6136 N at 0.5 MPa. Step down to an 80 mm bore (2513 N at 0.5 MPa) if your load is lighter and you want to save space. The adjustable 375-425 mm window is ideal for variable end stops and machine setup, whereas a fixed SAI cylinder locks you into a single 425 mm dimension. Since the stroke is 425 mm, an external guide is recommended to prevent side-load damage on the 32 mm rod.
For an exact ISO 15552 replacement match, specify a 125 mm bore, 425 mm stroke, 50 mm adjustment range, PT port threads, and your required mounting style. Remember that a plain SAIJ does not hold its position without live air; the rear adjuster is a stop, not a lock. For true load-holding without air pressure, use an SAIL (air-released lock), BSAI (clamp-lock), or an external rod lock.
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 SAIJ125AX425-50 FAQ
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw lets you trim the effective travel back by up to 50 mm, creating a usable stroke window of 375 to 425 mm. The adjuster acts as a mechanical stop to set the travel end and does not lock the load without live air.
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