Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-100S 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 SAIJ125AX300-100S
The AirTAC SAIJ125X300-100-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the end position without swapping out the unit. Based on a 300 mm nominal stroke and a 100 mm adjustment code, it provides a usable travel window of 200-300 mm, making it highly effective for product-size changeovers on long-stroke lines. Delivering 6136 N of push force at 0.5 MPa, it carries heavy loads with precision.
This specific SKU is configured with a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic solid-state sensors. The extruded aluminum barrel features sensor grooves on both sides for flexible switch mounting. It operates at speeds between 30-500 mm/s and uses a G1/2 port with PT tapered threading for secure pneumatic connections.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-100S |
|---|---|
| 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 SAIJ125AX300-100S
| 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 SAIJ125AX300-100S Is Used
Variable End-Stop Positioning
Dial in the exact retraction point within the 200-300 mm window during machine setup, allowing precise positioning of large materials without physically remounting the cylinder.
Product-Size Changeover
Quickly adapt automated lines to different pallet or part heights by turning the rear adjuster, reducing downtime when switching between product runs.
Heavy-Duty Forming Stops
Leverage the 6136 N push force at 0.5 MPa to act as a robust, adjustable physical stop for heavy workpiece routing or bending operations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX300-100S the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application requires the 6136 N push thrust at 0.5 MPa, stepping up from a 100 mm bore that yields 3927 N, while avoiding the larger 160 mm frame that delivers 10053 N. The adjustable stroke is chosen over a fixed SAI model when you need commissioning flexibility to dial in exact end-stops across varying product sizes. Because the rear adjuster acts only as a travel stop and the air cushions handle deceleration, neither will hold a load without live air; for dead-load holding, consider an AirTAC SAIL locking cylinder or an external rod lock.
For an exact ISO 15552 replacement match, verify the 125 mm bore, 300 mm stroke, 100 mm adjustment range, G1/2 port with PT tapered threads, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Since the stroke is 300 mm, the M27x2 rod thread and 32 mm rod diameter provide substantial rigidity, but an external guide is still recommended to prevent excessive side-loading on long unsupported travels.
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 SAIJ125AX300-100S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides a push force of 6136 N and a pull force of 5734 N. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective travel from the 300 mm nominal stroke by up to 100 mm, creating a 200-300 mm usable window. It is a travel stop, not a lock, and the cylinder remains double-acting.
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