Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-10 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
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-10
The AirTAC SAIJ125X250-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 240-250 mm usable travel window, allowing you to dial back the 250 mm nominal stroke by up to 10 mm during machine setup. Equipped with a SUS304 stainless steel rod and a PT tapered port, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting.
This adjustable model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting the FB, CA, CB, and CR options. The rear adjuster acts purely as a mechanical stop to fine-tune the retract end position without adding external stops; it does not hold the load without live air pressure. For load-holding requirements without continuous air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-10 |
|---|---|
| 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 SAIJ125BX250-10
| 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 SAIJ125BX250-10 Is Used
Machine Changeover
Dial in the 240-250 mm travel window precisely when switching product sizes on a packaging line, avoiding the need to swap out the entire cylinder.
Assembly Positioning
Leverage the 6136 N push force to press components, using the 10 mm rear stopper to fine-tune the final seating depth during commissioning.
End-Stop Calibration
Set exact retract positions on automated conveyors, using the standard ISO 15552 footprint to ensure seamless integration into existing machinery.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125BX250-10 the Right Cylinder?
Choose this 125 mm bore when your application requires the 6136 N push force at 0.5 MPa, which is a significant step up from the 80 mm bore's 2513 N. The 10 mm adjustable window is ideal for product changeovers where exact end-position tuning is needed without physically swapping the cylinder. Since the stroke is 250 mm, the 32 mm diameter rod provides robust resistance to side loads, though an external guide is still recommended for heavy offset loads. To match an ISO 15552 replacement, verify the 250 mm stroke, 10 mm adjustment, PT port, and desired mounting style.
If your process demands holding the load statically without live air pressure, do not rely on this cylinder's rear stopper or air cushions. You must specify an external rod lock or pilot-operated check valve, or switch to the AirTAC SAIL or BSAI clamping series for true mechanical holding power.
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 SAIJ125BX250-10 FAQ
At 0.5 MPa, this cylinder provides 6136 N of push force and 5734 N of pull force. At 1.0 MPa, the maximum push force is 11045 N. The operating speed range for this 125 mm bore is 30-500 mm/s.
The rear adjuster screw lets you mechanically shorten the 250 mm nominal stroke by up to 10 mm, creating a 240-250 mm usable travel window. It functions as an end-position stop for fine-tuning at commissioning and does not lock or hold the load without continuous air pressure.
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