Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20S
The AirTAC SAIJ125X550-20-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 550 mm travel by up to 20 mm for a precise 530-550 mm usable window. It delivers substantial thrust, generating 8590 N of push force at 0.7 MPa, making it suitable for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a built-in magnet for CMSE and DMSE sensors. The extruded aluminum barrel incorporates sensor grooves on both sides, and the PT tapered port threads ensure a secure pneumatic connection.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125AX550-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125AX550-20S Is Used
Heavy-Duty Press Tuning
Dial in the exact 530-550 mm end-of-stroke position during machine setup to accommodate varying material thicknesses without swapping cylinders.
Product Changeover Stops
Adjust the rear stopper on the fly when a packaging line switches to a different pallet size, ensuring precise indexing every time.
Large Assembly Positioning
Leverage the 8590 N push force at 0.7 MPa to move heavy components into place, using the fine adjustment to perfect the final resting point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-20S the Right Cylinder?
Choose this 125 mm bore when you need significantly more force than a 100 mm cylinder (which provides 5497 N push at 0.7 MPa) but want to avoid the bulk of a 160 mm unit. The adjustable stroke is ideal for fine-tuning end positions during commissioning or product changeovers without adding external stops. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding, consider an external rod lock or the SAIL/BSAI series.
Because this model features a 550 mm stroke, the 32 mm rod diameter and M27x2 rod thread still require external guidance to prevent excessive side-loading on the piston. To match this ISO 15552 footprint exactly, ensure your replacement matches the 125 mm bore, 550 mm stroke, 20 mm adjustment, PT G1/2 port, and -S magnet requirement. The available 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 SAIJ125AX550-20S FAQ
At an operating pressure of 0.7 MPa, this 125 mm bore cylinder provides 8590 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel from the nominal 550 mm down to 530 mm. This creates a 530-550 mm usable window for fine-tuning the retract end position at commissioning without needing external stops.
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