Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 250mm 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
- Stroke250 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75S
The AirTAC SAIJ125X250-75-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that provides a usable travel window of 175-250 mm. Equipped with a SUS420J2 stainless steel rod and a magnetic piston for CMSE or DMSE sensors, it delivers 6136 N of push force at 0.5 MPa. The built-in adjuster allows precise end-position tuning during commissioning without adding external stops.
Because the 125 mm bore operates at 30-500 mm/s, the 40 mm cushion length effectively absorbs kinetic energy at travel ends. The rear screw mechanism acts purely as a travel stop to dial in the 75 mm variance, not as a lock. For load-holding without live air pressure, you must integrate an external rod lock or select an AirTAC SAIL or BSAI cylinder.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 250 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 SAIJ125AX250-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×250 | 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 SAIJ125AX250-75S Is Used
Product Changeover
Dial in the 175-250 mm travel window during format changes on packaging lines, setting new end positions without mechanical rework.
End-Position Tuning
Fine-tune the retract stop at commissioning to perfect alignment, using the rear adjuster rather than adding external stopper blocks.
Variable End Stops
Handle diverse part sizes on a single conveyor station by adjusting the stroke up to 75 mm to accommodate different material widths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-75S the Right Cylinder?
Choose this 125 mm bore if your application requires the 6136 N push force at 0.5 MPa; step down to an 80 mm bore (2513 N) if your load is lighter, or up to a 160 mm bore (10053 N) for heavier demands. The adjustable 175-250 mm travel window is ideal for machines running multiple product sizes, allowing rapid changeover without swapping the cylinder.
When replacing an ISO 15552 unit, match the 125 mm bore, 250 mm stroke, 75 mm adjustment range, PT tapered port threads, and the -S magnet. The 250 mm stroke is under the 1500 mm maximum, but you should still support long strokes with an external guide to prevent rod side-loading. SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ125AX250-75S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach up to 1251 kgf at 1.0 MPa.
The rear adjuster acts as a mechanical stop that lets you trim the effective travel back from the 250 mm nominal stroke, creating a 175-250 mm usable window. It decelerates the travel end but does not lock the load without live air.
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