Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 135mm 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
- Stroke135 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-30S
The AirTAC SAIJ125X135-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 105-135 mm. The integrated -S magnet supports position detection via AirTAC CMSE reed and DMSE electronic sensors.
This unit features a SUS420J2 stainless steel rod for corrosion resistance and utilizes a PT tapered G1/2 port. The external rear stopper allows precise end-position tuning during commissioning without adding external stops. The adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 135 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 SAIJ125AX135-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×135 | 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 SAIJ125AX135-30S Is Used
Machine Changeover
Dial in the 105-135mm travel window during product size transitions without swapping the cylinder or bolting on external stops.
Variable End-Stop
Fine-tune the retract position at commissioning to dial out mechanical tolerance and achieve precise end-of-stroke positioning.
Heavy Forming Press
Leverage 6136N of thrust at 0.5 MPa for high-force clamping and forming operations requiring adjustable travel limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX135-30S the Right Cylinder?
Choose this 125mm bore when 80mm (2513N at 0.5 MPa) lacks thrust or 160mm (10053N) is oversized. The 30mm adjustment window is ideal for product changeovers requiring variable end-stops instead of fixed SAI cylinders. To match ISO 15552 dimensions, specify the 135mm stroke, 30mm adjust, PT G1/2 port, and -S magnet.
With a 135mm stroke, the 32mm rod diameter handles side loads well, but an external guide rail is recommended for heavy lateral loads. For load-holding without live air, select the SAIL or BSAI series, as the SAIJ rear adjuster is not a mechanical 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 SAIJ125AX135-30S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure rating.
The rear adjuster acts as a mechanical stop that trims the retract stroke. For this 135mm nominal stroke model, you can shorten the effective travel by up to 30mm, creating a 105-135mm usable window. The adjuster sets the travel end but does not lock the load without live air.
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