Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 125mm 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
- Stroke125 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20
The AirTAC SAIJ125X125-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 105-125 mm, allowing you to dial back the nominal 125 mm stroke by up to 20 mm during commissioning. This bore size generates a substantial 6136 N push force at 0.5 MPa, making it suitable for heavy-duty positioning tasks.
The rear adjustment screw acts purely as a travel stop to set the retract end-position accurately without swapping cylinders or adding external stopper blocks. It relies on the standard PT tapered G1/2 port and operates at speeds of 30-500 mm/s. Remember that the adjuster and the variable air cushions decelerate the load but do not hold it without live air pressure; for true load-holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 125 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 SAIJ125X125-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×125 | 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 SAIJ125X125-20 Is Used
Variable End-Stop Tuning
Dial in the retract stroke from 105 to 125 mm to accommodate varying material thicknesses without installing external physical stops on the machine frame.
Heavy-Duty Changeover
Leverage the 6136 N push force at 0.5 MPa to shift heavy pallets or fixtures, adjusting the end-position mechanically during production line format changes.
Press Fit Calibration
Fine-tune the pressing depth of large components at commissioning, using the rear screw to set the exact 105-125 mm travel window required for delicate assembly operations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X125-20 the Right Cylinder?
Select this 125 mm bore adjustable cylinder when a machine requires precise end-stop tuning during product changeovers, delivering 6136 N of thrust at 0.5 MPa (or 8590 N at 0.7 MPa). If your application needs less force, stepping down to the 100 mm bore yields 3927 N at 0.5 MPa, whereas stepping up to the 160 mm bore provides 10053 N. Choose this SAIJ model over a fixed-stroke SAI when you need on-the-fly mechanical fine-tuning of the retract position.
For a seamless ISO 15552 replacement, match the 125 mm bore, 125 mm stroke, 20 mm adjustment range, PT G1/2 port, and the required mounting accessory. The SAIJ series supports a specific mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). The carbon steel rod and M27x2 thread are robust, but because this cylinder lacks a -S magnet, it cannot host AirTAC CMSE or DMSE sensors without modification.
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 SAIJ125X125-20 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, creating a usable travel window of 105 to 125 mm. It acts as a mechanical stop to fine-tune the end position at commissioning without changing the cylinder itself.
At 0.5 MPa, the SAIJ125X125-20 provides 6136 N of push force and 5734 N of pull force. If higher pressure is available, it can deliver up to 8590 N of push force at 0.7 MPa.
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