Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30 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 SAIJ125X450-30
The AirTAC SAIJ125X450-30 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, making it suited for heavy-duty positioning. The integrated adjuster allows you to trim the effective travel back by up to 30 mm, creating a precise 420-450 mm usable stroke window without needing external stops.
This model uses a carbon steel piston rod with an M27x2 thread and PT tapered ports. It features variable air cushions at both ends to manage kinetic energy, but note that the rear adjuster acts only as a travel stop and does not hold the load without live air. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to add CMSE reed or DMSE electronic sensors if position feedback is required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30 |
|---|---|
| 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 SAIJ125X450-30
| 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 SAIJ125X450-30 Is Used
Variable End-Stop Machining
Dial in the 420-450 mm retract position on the fly to accommodate different part lengths during short-run machining operations.
Product Changeover Diverter
Quickly adjust the stroke by up to 30 mm during line changeovers to handle varying package sizes without repositioning the cylinder.
Heavy-Duty Press Setup
Leverage the 6136N push force at 0.5 MPa for pressing tasks, using the rear screw to fine-tune the bottom dead center during commissioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X450-30 the Right Cylinder?
Choose this 125 mm bore cylinder when a 100 mm bore (offering 3927N push at 0.5 MPa) lacks the thrust for your process, but a 160 mm bore is physically oversized. The adjustable 420-450 mm travel window is ideal for product changeovers, letting you fine-tune the retract end-position at commissioning rather than swapping out a fixed-stroke SAI cylinder. Because the 450 mm stroke is substantial, an external guide is recommended to prevent excessive side-loading on the M27x2 rod.
For drop-in replacements, match the 125 mm bore, 450 mm stroke, PT port thread, and carbon steel rod. SAIJ supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. If your application requires true load-holding without continuous air pressure, a standard SAIJ will not suffice; consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
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 SAIJ125X450-30 FAQ
The rear adjuster screw acts as a mechanical stop that shortens the retract stroke by up to 30 mm. This gives you a usable travel window of 420-450 mm, allowing precise end-position tuning without changing the cylinder or adding external stops.
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
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