Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-100S 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 SAIJ125X300-100S
The AirTAC SAIJ125X300-100-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5MPa and features a 300mm nominal stroke that can be dialed back by up to 100mm, yielding a precise 200-300mm usable travel window. This wide adjustment range is ideal for accommodating multiple product sizes on a single line without swapping hardware.
This bore utilizes a 32mm carbon steel rod with an M27x2 thread and a G1/2 port. It includes a magnetic piston (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic sensors, which seat cleanly into the dual sensor grooves on the extruded aluminum barrel. The 125mm bore operates at a maximum speed of 30-500mm/s and relies on 40mm variable air cushions at both ends to decelerate heavy loads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-100S |
|---|---|
| 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 SAIJ125X300-100S
| 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 SAIJ125X300-100S Is Used
Multi-Product Forming Lines
Leverage the 200-300mm travel window to switch between forming different part lengths on the same fixture, using the rear screw to set the exact bottoming depth without changing cylinders.
Automated Machine Setup
Dial in the precise end-of-stroke position during initial commissioning, absorbing mechanical tolerances by adjusting the rear stopper rather than adding shims.
Variable Stop Positioning
Provide a mechanical fallback for positioning heavy loads, using the 100mm adjustment range to alter the retract distance on the fly for varying package sizes.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-100S the Right Cylinder?
Choose this 125mm bore when an application requires substantial thrust—stepping up from a 100mm bore increases push force from 3927N to 6136N at 0.5MPa. The 100mm adjustment window is the primary draw here, allowing operators to fine-tune end positions during commissioning or product changeovers rather than machining external stops. Because the nominal stroke is 300mm, the 32mm rod will experience leverage forces under load; an external guide is recommended to prevent excessive side-loading and premature seal wear.
When specifying a replacement, ensure the configuration matches this exact SKU: 125mm bore, 300mm stroke, 100mm adjustment, PT tapered port thread, carbon steel rod, and a magnetic piston for position sensing. Remember that the rear adjuster is a travel stop, not a locking device. The SAIJ relies on live air to maintain position; for true load-holding without pressure, select an AirTAC SAIL or BSAI cylinder. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X300-100S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At its maximum 1.0MPa pressure, it can deliver up to 1251kgf.
The rear adjuster acts as an external stop that shortens the effective travel. For this 300mm stroke model, you can trim the retract distance by up to 100mm, creating a usable travel window between 200mm and 300mm to fine-tune the end position without live air locking.
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