Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-50S 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 SAIJ125AX450-50S
The AirTAC SAIJ125X450-50-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 400 to 450 mm usable travel window, allowing you to dial back the nominal 450 mm stroke by up to 50 mm during machine commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy positioning tasks. The -S magnet enables position sensing with AirTAC CMSE reed and DMSE electronic switches.
This model uses a SUS420J2 stainless steel rod for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides. The rear adjuster acts purely as a travel stop for end-position tuning; it does not lock or hold the load pneumatically. For load-holding without live air pressure, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-50S |
|---|---|
| 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 SAIJ125AX450-50S
| 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 SAIJ125AX450-50S Is Used
Product Changeovers
Dial in the 400-450 mm travel window on the fly to accommodate varying package sizes without physically replacing the actuator.
Commissioning Tuning
Fine-tune the retract end-position during initial setup to perfect timing and avoid mechanical crashes without external stoppers.
Heavy Assembly Pressing
Leverage 6136 N of push force at 0.5 MPa for heavy-duty component seating while relying on the rear screw for precise positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX450-50S the Right Cylinder?
Select this 125 mm bore when 0.5 MPa thrust is insufficient for your application but a smaller 100 mm bore (3927 N) is undersized. An adjustable stroke is ideal for product changeovers on automated lines, letting you fine-tune the end stop without adding external physical stops or swapping cylinders. Because the nominal stroke is 450 mm, an external guide is recommended to prevent side-load damage to the 32 mm rod during extended travel.
When matching this ISO 15552 cylinder for a replacement, confirm the 125 mm bore, 450 mm stroke, 50 mm adjustment range, PT port threads, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
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 SAIJ125AX450-50S FAQ
The rear adjuster lets you shorten the effective travel from 450 mm down to 400 mm. It acts as a mechanical stop to fine-tune the end position at commissioning; it is not a lock and will not hold the load without live air pressure.
At 0.5 MPa it provides 6136 N of push force and 5734 N of pull force. The operating speed range for the 125 mm bore is 30-500 mm/s, supported by variable air cushions at both ends.
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