Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-20S 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 SAIJ125AX250-20S
The AirTAC SAIJ125X250-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 250 mm travel by up to 20 mm. This creates a precise 230-250 mm usable window for fine-tuning the retract end position at commissioning without swapping hardware. Delivering 6136 N push force at 0.5 MPa, it handles heavy loads with a 32 mm SUS420J2 stainless steel rod and PT tapered port.
This variant includes a magnet for CMSE reed and DMSE electronic sensors, fitting neatly into the extruded aluminum barrel grooves. The rear adjuster acts purely as a mechanical stop for end-position tuning, not a lock, meaning live air is required to hold the load. It supports a 30-500 mm/s speed range and uses adjustable air cushions at both ends to manage kinetic energy.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-20S |
|---|---|
| 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 SAIJ125AX250-20S
| 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 SAIJ125AX250-20S Is Used
Product Changeover
Dial in the 230-250 mm retract position during format size changes on packaging lines without replacing the cylinder.
End-Stop Calibration
Fine-tune the final resting position of heavy 6136 N press tools during machine commissioning.
Heavy Material Handling
Move substantial workpieces at 30-500 mm/s, relying on the 32 mm SUS420J2 rod for durability.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-20S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (3927 N at 0.5 MPa) lacks thrust but a 160 mm bore is physically too large. The adjustable 230-250 mm window is ideal for product changeovers where exact end-stops vary, saving the cost of adding external stops. For any load-holding requirements without continuous air pressure, this cylinder is insufficient as the adjuster is only a stop; an external rod lock or a SAIL/BSAI locking cylinder is required.
Since the 250 mm stroke is below the 300 mm side-load threshold, the robust 32 mm rod handles standard guiding well, though external guides are recommended for heavy offset loads. To match this ISO 15552 dimensionally interchangeable cylinder, specify the 125 mm bore, 250 mm stroke, PT port thread, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, 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 SAIJ125AX250-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder 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 allows you to shorten the 250 mm nominal stroke by up to 20 mm, providing a usable travel window of 230 to 250 mm. It functions as a mechanical stop for position tuning and does not lock the load without live air.
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