Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 200mm 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
- Stroke200 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-40S
The AirTAC SAIJ125X200-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 160 to 200 mm. Fitted with a PT tapered G1/2 port and a 32 mm carbon steel rod, it delivers a robust 6136 N push force at 0.5 MPa. The extruded aluminum barrel features sensor grooves on both sides, and the integrated -S magnet supports position detection.
This adjustable-stroke design allows you to fine-tune the retract end-position during commissioning without swapping the cylinder or adding external stops. The rear adjuster functions strictly as a travel stop for deceleration, not a lock, meaning live air is required to hold the load. For position holding without air pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 200 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 SAIJ125X200-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×200 | 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 SAIJ125X200-40S Is Used
Machine Changeover
Dial in the 160-200 mm travel window during product size changes without physically swapping the cylinder or adding external stopper blocks.
End-Position Tuning
Fine-tune the retract stroke at commissioning to perfectly align tooling, using the rear screw to set the exact 40 mm trim window.
Variable Diverting
Adjust the diverting stroke on the fly to handle different package sizes on a packaging line, ensuring precise end-stop positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X200-40S the Right Cylinder?
Choose this 125 mm bore when you need higher force than the 100 mm option (3927 N at 0.5 MPa) but want to avoid the bulk of a 160 mm cylinder. The 40 mm adjustment range is ideal for product changeovers on a line, letting you dial in the exact end-stop without hardware changes. Unlike a fixed-stroke SAI, this cylinder lets you trim the travel window on the fly.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 200 mm stroke, 40 mm adjustment, PT port thread, and the -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 200 mm, side-load is moderate, but an external guide is 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 SAIJ125X200-40S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. The maximum thrust is 1251 kgf at 1.0 MPa.
The rear adjuster acts as a stop that lets you shorten the effective stroke by up to 40 mm, creating a usable travel window of 160 to 200 mm. It only sets the travel end and does not lock the load without live air.
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