Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-20 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 SAIJ125AX250-20
The AirTAC SAIJ125X250-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 230 to 250 mm, allowing you to dial back the nominal 250 mm stroke by up to 20 mm during commissioning. Equipped with a SUS420J2 stainless steel rod, it delivers robust thrust, generating 6136 N of pull force at 0.5 MPa and 8590 N at 0.7 MPa.
This adjustable-stroke design eliminates the need to swap cylinders or bolt on external stops when fine-tuning end positions. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting. Note that the rear adjuster acts strictly as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-20 |
|---|---|
| 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 SAIJ125AX250-20
| 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 SAIJ125AX250-20 Is Used
Precision End-Stop Tuning
Fine-tune the retract position within a 230-250 mm window during machine commissioning without replacing the cylinder.
Product Changeover
Quickly adjust the stroke by up to 20 mm to accommodate varying product sizes on a packaging line.
Heavy Forming Operations
Leverage the 8590 N push force at 0.7 MPa for pressing and clamping tasks requiring precise depth control.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX250-20 the Right Cylinder?
Choose this 125 mm bore when you need higher force than the 80 mm class, which offers 2268 N of pull at 0.5 MPa. The SAIJ125X250-20 is ideal for applications requiring exact end-position tuning without changing the cylinder. It uses a PT tapered port thread and operates at speeds of 30-500 mm/s. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
For load-holding without live air pressure, consider the SAIL or BSAI series instead, as the SAIJ adjuster is not a lock. Since the 250 mm stroke exceeds 300 mm only slightly, standard side-load precautions still apply, and an external guide is recommended for heavy 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 SAIJ125AX250-20 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, providing an adjustable travel window of 230 to 250 mm without altering the cylinder mounting.
At an operating pressure of 0.5 MPa, it delivers 6136 N of pull force and 8590 N of push force at 0.7 MPa.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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