Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-10S 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 SAIJ125AX650-10S
The AirTAC SAIJ125X650-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to fine-tune the travel end during commissioning. It provides a usable stroke window of 640 to 650 mm, giving you a 10 mm trim range to dial in the exact retract position without adding external stops. Driven by a 32 mm SUS420J2 stainless steel rod, it delivers 6136 N of pull force at 0.5 MPa and handles speeds of 30-500 mm/s.
This variant includes a piston magnet for position sensing with AirTAC CMSE reed or DMSE electronic switches. It uses a PT tapered G1/2 port and relies on a 40 mm variable air cushion at both ends to decelerate the load. The rear adjuster acts purely as a mechanical stop and does not hold the load without live air pressure; for true load-holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-10S |
|---|---|
| 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 SAIJ125AX650-10S
| 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 SAIJ125AX650-10S Is Used
Machine Changeover
Dial in the 640-650 mm retract position during product size changeovers without physically swapping out the entire cylinder.
End-Position Tuning
Fine-tune the final retract stop during machine commissioning to absorb mechanical tolerances and achieve exact positioning.
Heavy Assembly Pressing
Leverage the 6136 N pull force at 0.5 MPa to securely seat heavy components, using the adjustable stop to prevent over-travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX650-10S the Right Cylinder?
Choose this 125 mm bore when you need substantial thrust that exceeds the 3927 N push force of a 100 mm cylinder but want to avoid the bulk of a 160 mm bore. The 10 mm adjustment window is ideal for applications requiring minor end-position corrections at setup or during product changeovers, offering flexibility a fixed-stroke SAI cylinder cannot match.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 650 mm stroke, 10 mm adjustment range, PT G1/2 port, and the -S magnet requirement. Because the stroke is 650 mm, the long unsupported piston rod is susceptible to side-loading; always use an external guide to prevent premature seal wear and binding.
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 SAIJ125AX650-10S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder generates 6136 N of pull force and 8590 N of push force. It can deliver up to 11045 N of push force at 0.9 MPa.
A rear external screw stopper lets you shorten the nominal 650 mm stroke by up to 10 mm, creating a 640-650 mm usable travel window. This allows precise end-position tuning without swapping the cylinder.
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