Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20S
The AirTAC SAIJ125X650-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 630 to 650 mm. It delivers 6133 N of push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa, making it suited for heavy-duty positioning. The integrated -S magnet enables position sensing via CMSE reed or DMSE electronic switches.
This model features a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and uses PT tapered port threads. Because the 650 mm stroke is substantial, the 32 mm rod diameter and M27x2 rod thread handle significant loads, though an external guide is recommended to manage side-load on long travels. The rear adjuster acts solely as a travel stop for end-position tuning, not a load-holding lock.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 SAIJ125AX650-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAIJ125AX650-20S Is Used
Heavy Press Tuning
Dial in the exact 630-650 mm end-stop during heavy press commissioning to accommodate material thickness variations without re-mounting the actuator.
Product Changeover Stops
Adjust the retract position on the fly when switching between product sizes on a packaging line, using the rear screw to set a new physical travel limit.
Large Fixture Positioning
Move heavy industrial fixtures with 11045 N of force at 0.9 MPa while fine-tuning the final resting position to match fixture tolerances.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-20S the Right Cylinder?
Select this 125 mm bore when an application requires high thrust combined with exact end-position tuning at commissioning; if you need less force, stepping down to a 100 mm bore yields 3927 N push at 0.5 MPa. The 20 mm adjustable window allows precise variable end-stops during machine changeover without swapping cylinders or adding external stops. For matching an ISO 15552 replacement, verify the 125 mm bore, 650 mm stroke, 20 mm adjustment, PT G1/2 port, and the -S magnet.
Because the stroke is 650 mm, an external guide should support the load to prevent excessive side-loading on the rod. Remember that the rear adjuster and air cushions only decelerate the travel end; this plain SAIJ does not hold the load without live air. For true fail-safe load holding, consider an AirTAC SAIL or BSAI 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 SAIJ125AX650-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6133 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjusting screw allows you to shorten the 650 mm nominal stroke by up to 20 mm, creating a 630 to 650 mm usable travel window. This stop fine-tunes the end position but does not lock the load without live air pressure.
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