Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-75S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-75S
The AirTAC SAIJ125X800-75-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5 MPa and utilizes a 32mm SUS420J2 stainless steel rod with an M27x2 thread. The built-in -S magnet enables position sensing with AirTAC CMSE reed or DMSE electronic switches fitted into the dual-side barrel grooves.
This specific SKU provides an 800mm nominal stroke that can be mechanically dialed back by up to 75mm, yielding a 725-800mm usable travel window. The rear adjuster acts purely as a physical stop to fine-tune the retract end position during commissioning or product changeover, meaning it does not lock or hold the load without continuous live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-75S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAIJ125AX800-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SAIJ125AX800-75S Is Used
Variable End-Stop Positioning
Dial in the exact retract position within a 725-800mm window to accommodate varying product lengths without changing the cylinder.
Heavy-Duty Changeover
Rapidly adjust the stroke stop during machine format changeovers, leveraging the 6136N thrust capacity for large actuation tasks.
Long-Stroke Assembly Press
Utilize the 800mm travel for extended reach operations while relying on the rear screw to fine-tune the final end-position precisely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-75S the Right Cylinder?
Choose this 125mm bore model when a process requires heavy thrust (6136N at 0.5MPa) alongside variable end-stop positioning, stepping up from a 100mm bore that provides 3927N. The 75mm adjustment window is ideal for accommodating multiple product sizes on a single line without swapping the cylinder. For position holding without live air, select the SAIL or BSAI series instead, as the SAIJ adjuster is strictly a travel stop.
When replacing an ISO 15552 cylinder, match the 125mm bore, 800mm stroke, 75mm adjustment range, PT tapered port thread, and the -S magnet requirement. Given the 800mm stroke, an external guide is strongly recommended to prevent excessive side-loading on the M27x2 rod. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125AX800-75S FAQ
At 0.5 MPa it provides 6136N push and 5734N pull force, scaling up to 11045N push at 0.9 MPa. The operational speed range for this 125mm bore is 30-500 mm/s.
The rear adjuster acts as a mechanical stop that trims the 800mm nominal stroke back by up to 75mm, creating a 725-800mm usable travel window. It sets the end position but does not lock the load without live air.
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