Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 40mm 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
- Stroke40 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30S
The AirTAC SAIJ125X40-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 10-40 mm usable travel window from its 40 mm nominal stroke. Delivering 6136 N of push thrust at 0.5 MPa, it provides substantial force for heavy-duty positioning. The extruded aluminum barrel includes sensor grooves on both sides, and this variant includes a magnet for CMSE reed and DMSE electronic switches.
Instead of swapping cylinders during commissioning, the rear stopper screw lets you fine-tune the retract end position directly. The adjuster acts as a travel stop to set deceleration alongside the air cushions, but it will not hold a load without live air pressure. For dead-load holding, consider SAIL or BSAI series cylinders.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 40 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 SAIJ125X40-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×40 | 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 SAIJ125X40-30S Is Used
Product Changeover
Dial in the exact 10 to 40 mm retract position during format size changes without physically replacing the cylinder or adding external stopper blocks.
Commissioning Tuning
Fine-tune the end-of-stroke position during machine setup to absorb mechanical tolerance variations and achieve precise alignment.
Heavy Positioning
Leverage the 6136 N push thrust at 0.5 MPa to shift heavy fixtures into their exact final positions, using the rear screw for exact depth control.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X40-30S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (3927 N at 0.5 MPa) lacks the power to move your load, but a 160 mm bore (10053 N) would be excessive overkill. An adjustable stroke is selected over a fixed SAI cylinder when a machine requires variable end-stops for rapid product changeovers. To match this ISO 15552 footprint, specify the 125 mm bore, 40 mm stroke, 30 mm adjustment, PT port thread, and the -S magnet. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X40-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push thrust and 5734 N of pull thrust. It can deliver up to 1251 kgf at its maximum 1.0 MPa pressure.
The rear adjuster screw trims the effective stroke by up to 30 mm. For this 40 mm nominal stroke model, it creates a usable travel window between 10 and 40 mm, allowing you to set the exact retract position without altering the cylinder mounting.
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