Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 450mm 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
- Stroke450 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30
The AirTAC SAIJ125X450-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 420-450 mm usable travel window, allowing you to dial back the nominal 450 mm stroke by up to 30 mm during commissioning. In this configuration, the rod is manufactured from SUS420J2 stainless steel (code A) for enhanced corrosion resistance, and the fluid ports utilize a PT tapered thread type.
Delivering 6136 N of push force and 5734 N of pull force at 0.5 MPa, this bore size is built for heavy-duty handling. The rear adjuster functions purely as a travel stop to fine-tune the end position; it is not a locking mechanism and will not hold a load without continuous air pressure. For position-holding requirements without live pressure, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 450 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 SAIJ125AX450-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×450 | 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 SAIJ125AX450-30 Is Used
Machine Setup Changeover
Fine-tune the 420-450 mm travel window during product line changeovers to accommodate varying part sizes without replacing the cylinder.
Heavy-Duty Variable End Stops
Dial in the exact retraction point for heavy 6136 N push-force operations, ensuring precise positioning without adding external mechanical stops.
Long-Stroke Positioning
Utilize the 450 mm stroke for long-travel material handling, relying on the rear adjuster to trim the final 30 mm of movement for safe docking.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-30 the Right Cylinder?
Select this 125 mm bore cylinder when your application requires substantial thrust but demands precise end-position tuning without swapping out physical components. If you need less force, stepping down to an 80 mm bore yields 2513 N of push force at 0.5 MPa, whereas stepping up to a 160 mm bore provides 10053 N for heavier loads. The adjustable stroke is ideal for machine setups requiring variable end stops or product-size changeovers.
Because the stroke is 450 mm, you must account for potential side-loading forces; an external guide is recommended to prevent premature wear on the M27x2 rod thread and seals. To replace an existing ISO 15552 cylinder, match the 125 mm bore, 450 mm stroke, 30 mm adjustment, PT ports, and mounting choice (Basic, FA, LB, TC, FTC, TCM1, or TCM2). Note that this unit lacks a magnet, so it will not work with CMSE or DMSE sensors.
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 SAIJ125AX450-30 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 11045 N of push force at 0.9 MPa.
The rear adjuster acts as a stopper that lets you shorten the effective stroke from 450 mm down to a minimum of 420 mm. This allows precise end-position tuning at commissioning without swapping the cylinder.
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