Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20
The AirTAC SAIJ125X300-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 280-300mm usable travel window. Delivering 6136N of push force at 0.5 MPa, it handles heavy-duty positioning with precision. The PT G1/2 port and M27x2 rod thread provide robust pneumatic and mechanical interfaces for high-load cycles.
This SKU omits the FB, CA, CB, and CR mountings, offering the reduced SAIJ set of Basic, FA, LB, TC, FTC, TCM1, and TCM2. The rod is constructed from SUS420J2 stainless steel for enhanced corrosion resistance. Because the 300mm stroke is substantial, an external guide is recommended to manage side loads and prevent rod bending.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125AX300-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125AX300-20 Is Used
Heavy Fixture Alignment
Fine-tune the 280-300mm retract position to align large machining fixtures perfectly during setup, eliminating the need for external shims.
Product Changeover
Quickly adjust the end-stop by up to 20mm on a packaging line when switching to a different product size, minimizing downtime.
Press Assembly
Leverage the 6136N push force to seat heavy components, using the rear adjuster to precisely control the pressing depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20 the Right Cylinder?
Choose this 125mm bore when a 100mm bore (3927N push at 0.5MPa) lacks the thrust for your heavy fixtures, or step up to a 160mm bore (10053N) for extreme loads. The 20mm rear adjuster allows you to dial in the exact retract position during commissioning or product changeover without swapping cylinders or adding external stops. Remember that the rear adjuster is a travel stop, not a lock; it will not hold the load without live air. For dead-stop load holding, consider an AirTAC SAIL or BSAI cylinder.
To match this ISO 15552 interchangeable cylinder, verify the 125mm bore, 300mm nominal stroke, 20mm adjustment range, PT G1/2 port, and the required mounting bracket. No magnet is specified for this configuration, so position sensing via CMSE or DMSE switches is not supported without modification.
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 SAIJ125AX300-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.9 MPa, the push force increases to 11045N.
The rear adjuster acts as an external stopper, allowing you to shorten the effective stroke from 300mm down to 280mm. This enables fine end-position tuning during commissioning without replacing the cylinder, though it does not lock the load without live air.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-20
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.