Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20S
The AirTAC SAIJ125X115-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position. With a 115 mm nominal stroke and a 20 mm adjustment range, it provides a usable travel window of 95-115 mm. It delivers a robust 6136 N push force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This variant includes a SUS420J2 stainless steel rod (code A) for improved corrosion resistance and uses PT tapered ports. The extruded aluminum barrel features sensor grooves on both sides, and the integrated magnet (-S) enables position detection with CMSE reed or DMSE electronic sensors. The rear adjuster acts purely as a mechanical stop for deceleration and positioning, meaning it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 115 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 SAIJ125AX115-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×115 | 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 SAIJ125AX115-20S Is Used
Machine Changeover
Quickly reconfigure the end-stop position when switching product sizes on a packaging line, utilizing the 95-115 mm adjustable travel window.
Heavy-Duty Positioning
Leverage the 6136 N push force to move substantial jigs or fixtures into exact alignment during machining or assembly processes.
Commissioning Calibration
Fine-tune the retract end position during initial setup to compensate for mechanical tolerances without disassembling the fixture.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX115-20S the Right Cylinder?
Choose this 125 mm bore when your application requires higher thrust than the 100 mm bore (which provides 3927 N at 0.5 MPa) but does not need the full 15708 N force of the 200 mm version. An adjustable stroke is highly beneficial during machine commissioning or product changeovers, allowing you to dial in the exact end-stop without physically swapping the cylinder or adding external spacers.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 115 mm stroke, 20 mm adjustment, PT port thread, and -S magnet. SAIJ supports a specific mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. Because the rear screw is a travel stop and not a locking device, applications requiring true load-holding without continuous air pressure should utilize an external rod lock or explore the SAIL or BSAI series 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 SAIJ125AX115-20S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates a push force of 6136 N and a pull force of 5734 N. At the maximum rated pressure of 1.0 MPa, it can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, creating a usable travel window of 95-115 mm from the 115 mm nominal stroke. This mechanical stop fine-tunes the end position but does not lock the load without live air pressure.
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