Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 90mm 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
- Stroke90 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20
The AirTAC SAIJ125X90-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 90 mm nominal travel to a precise 70-90 mm window during commissioning. Built with a SUS420J2 stainless steel rod (material code A) and PT tapered ports, it provides 6136 N push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
This adjustable-stroke design eliminates the need to swap cylinders or bolt on external stops when fine-tuning the retract end position. The rear screw acts purely as a travel stop and works in tandem with the standard air cushion to decelerate the load; it does not hold the load without live air pressure. For position holding without compressed air, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 90 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 SAIJ125AX90-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×90 | 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 SAIJ125AX90-20 Is Used
Heavy-Duty Forming
Dial in the exact 70-90 mm retract position for stamping or forming dies during setup, accommodating material thickness variations without changing the cylinder.
Product Diversion
Adjust the end stop on the fly for different package sizes on a packaging line, ensuring precise physical contact without reprogramming machine logic.
Machine Commissioning
Fine-tune the final resting position of heavy actuators during initial machine build, absorbing mechanical tolerances by trimming up to 20 mm off the stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX90-20 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) is insufficient, but a 160 mm bore is too large. The SAIJ125X90-20 is ideal for applications requiring exact end-position tuning on product changeovers, whereas a fixed-stroke SAI cylinder lacks this commissioning flexibility. To match this ISO 15552 footprint exactly, specify the 125 mm bore, 90 mm stroke, 20 mm adjustment, PT ports, and your required mounting option.
Although the 90 mm stroke is relatively short, the 32 mm rod diameter handles substantial side loads. However, any long unsupported tooling mounted on the rod should still use an external guide. Note that SAIJ supports a specific mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options found on some other series.
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 SAIJ125AX90-20 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver up to 11045 N push force at 0.7 MPa.
The rear adjuster screw allows you to shorten the 90 mm nominal stroke by up to 20 mm, creating a usable travel window of 70-90 mm. The adjuster acts as a mechanical stop to set the end position and does not lock the load without continuous air pressure.
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