Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 300mm 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
- Stroke300 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50S
The AirTAC SAIJ125X300-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. It provides a usable travel window of 250 to 300 mm, allowing you to dial back the nominal 300 mm stroke by up to 50 mm without adding external stops. It delivers a robust 6136 N push force at 0.5 MPa, utilizing a PT tapered port and a 32 mm SUS420J2 stainless steel rod for high rigidity and corrosion resistance.
This model includes a magnet for position sensing and supports speeds of 30-500 mm/s. The extruded aluminum barrel features sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR to streamline setup.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 300 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 SAIJ125AX300-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×300 | 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 SAIJ125AX300-50S Is Used
Product Size Changeovers
Quickly fine-tune the end-of-stroke position from 250 to 300 mm when adapting machinery to run different product dimensions on the same line.
Machine Commissioning
Dial in the exact travel distance during initial setup without disassembling the fixture or installing physical spacer blocks on the tooling.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or transfer large workpieces while retaining the flexibility to trim the stroke.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-50S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust that exceeds the 3927 N push force of a 100 mm bore at 0.5 MPa, but does not warrant the extreme 10053 N output of a 160 mm unit. The adjustable 250-300 mm travel window is highly advantageous during machine commissioning or product size changeovers, enabling precise end-position tuning without physically swapping out the cylinder for a different fixed-stroke SAI variant.
Because the 300 mm stroke is substantial, the 32 mm rod provides excellent structural support, yet an external guide is still recommended to prevent excessive side-loading on the piston. Remember that the rear adjuster acts strictly as a travel stop to work alongside the variable air cushions; it does not lock or hold the load pneumatically. For secure load-holding without live air pressure, utilize an external rod lock or pilot-operated check valve, or select an AirTAC SAIL or BSAI cylinder instead. Dimensionally interchangeable per ISO 15552, this model requires a PT port, the specified mounting style, and a -S magnet for exact replacement.
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 SAIJ125AX300-50S FAQ
The rear adjuster screw acts as a mechanical stop that allows you to shorten the effective stroke by up to 50 mm. This creates a usable travel window of 250 to 300 mm, providing fine end-position tuning at commissioning without swapping the cylinder.
At a 0.5 MPa operating pressure, the SAIJ125X300-50-S generates a push force of 6136 N and a pull force of 5734 N. It can achieve a maximum push force of 11045 N at 0.9 MPa.
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