Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 120mm 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
- Stroke120 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20S
The AirTAC SAIJ125X120-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 100-120mm, letting you dial back the 120mm nominal stroke by up to 20mm during commissioning. This bore size generates 6136N of push force at 0.5MPa, making it well-suited for heavy-duty positioning tasks.
This variant includes a magnetic piston for position detection and uses a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance. The extruded aluminum barrel incorporates sensor grooves on both sides, supporting AirTAC CMSE reed and DMSE solid-state switches. It operates at speeds from 30-500mm/s and features adjustable air cushions at both ends to manage kinetic energy.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 120 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 SAIJ125AX120-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×120 | 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 SAIJ125AX120-20S Is Used
Product Changeovers
Quickly fine-tune the 100-120mm travel window to accommodate different product lengths on a packaging line without changing out the cylinder hardware.
Heavy Positioning
Leverage the 6136N push force to move substantial jigs or fixtures into exact working positions, dialing in the final 20mm of travel during machine setup.
Machine Setup
Use the rear stopper to set precise end-of-stroke limits during initial commissioning, ensuring heavy-duty actuators hit their marks perfectly.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX120-20S the Right Cylinder?
Select this 125mm bore cylinder when an application requires substantial thrust—6136N push and 5734N pull at 0.5MPa—combined with precise end-position tuning. If you need slightly less force, stepping down to a 100mm bore yields 3927N of push force. Choose the adjustable SAIJ over a fixed-stroke SAI when a machine requires variable end-stops for rapid product-size changeovers without physically swapping cylinders or adding external stops.
When matching this ISO 15552 cylinder for replacement, verify the 120mm stroke, 20mm adjustment range, PT tapered port threads, and the -S magnet option. Because the 120mm stroke is relatively short for this large bore, side-loading is less severe, but an external guide is still recommended for heavy loads. Remember that the rear adjuster acts only as a travel stop; it does not hold the load without live air pressure. For true load-holding without continuous air, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125AX120-20S FAQ
At a 0.5 MPa operating pressure, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjusting screw acts as an external stopper, allowing you to shorten the 120mm nominal stroke by up to 20mm. This creates a usable travel window of 100-120mm, which can be fine-tuned during commissioning without adding external stops.
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