Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20S
The AirTAC SAIJ125X55-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 35 to 55 mm, allowing you to dial back the 55 mm nominal stroke by up to 20 mm during commissioning. Belonging to the 125 mm bore class, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa.
This variant includes a -S magnet for position sensing with CMSE reed or DMSE solid-state switches. It uses a SUS420J2 stainless steel rod (option A) for improved corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAIJ125AX55-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAIJ125AX55-20S Is Used
Product Changeover Dials
Quickly fine-tune the 35-55 mm end-stop during packaging line format changes to accommodate varying carton sizes without replacing the cylinder.
Machine Setup Calibration
Dial in the exact retract position during initial commissioning, using the 20 mm adjustment range to absorb mechanical tolerances without external shims.
Heavy-Duty Clamping
Leverage the 6136 N push force at 0.5 MPa to securely hold heavy workpieces, relying on the rear stopper to set the precise clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20S the Right Cylinder?
Select this 125 mm bore cylinder when an 80 mm bore (delivering 2513 N push at 0.5 MPa) lacks sufficient thrust, but you want to avoid stepping up to a 160 mm unit. The adjustable 35-55 mm travel window is ideal for product changeovers, letting you fine-tune the retract end position without adding external stops or swapping the cylinder for a fixed-stroke SAI.
For ISO 15552 replacement matching, ensure you specify the 125 mm bore, 55 mm stroke, 20 mm adjustment range, PT ports, and the -S magnet. Remember that the rear adjuster is a travel stop, not a lock; it will not hold a load without live air. For true fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder instead.
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 SAIJ125AX55-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 55 mm nominal stroke by up to 20 mm, creating a 35-55 mm usable travel window. It only sets the end position and does not lock the load without live air pressure.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-20S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.