Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40 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 SAIJ125X300-40
The AirTAC SAIJ125X300-40 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 260 to 300 mm, allowing you to dial back the 300 mm nominal stroke by up to 40 mm during commissioning without adding external stops. Built with a 125 mm bore, it generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This model incorporates a 32 mm carbon steel piston rod with an M27x2 thread, designed to handle substantial side loads, though the 300 mm stroke still necessitates an external guide for optimal stability. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40 |
|---|---|
| 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 SAIJ125X300-40
| 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 SAIJ125X300-40 Is Used
Machine Setup & Changeover
Fine-tune the 260-300 mm travel window during line changeovers to accommodate different product sizes without physically swapping the cylinder.
Heavy Material Handling
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or chassis components, using the rear stopper to set exact resting positions.
Variable End-Stop Positioning
Dial in the exact retraction point during initial commissioning, utilizing the 40 mm adjustment range to compensate for mechanical tolerance stack-ups.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X300-40 the Right Cylinder?
Select this 125 mm bore adjustable-stroke cylinder when your application requires heavy force output—stepping up from a 100 mm bore yields 3927 N push at 0.5 MPa, while this model provides 6136 N. The rear adjuster allows precise end-position tuning for product changeovers, functioning purely as a travel stop rather than a load-holding lock. If you need to hold a load without live air pressure, consider the SAIL or BSAI series instead.
When specifying an ISO 15552 replacement, match the 125 mm bore, 300 mm stroke, 40 mm adjustment range, PT tapered port thread, and carbon steel rod material. Because this unit lacks the -S magnet suffix, it will not trigger position sensors out of the box. Furthermore, the 300 mm stroke demands attention to side-loading; always pair it with an external linear guide to prevent rod binding and premature seal wear.
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 SAIJ125X300-40 FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from 300 mm down to 260 mm. This provides a 40 mm tuning window for exact end-positioning without needing external stops or a different cylinder.
At a 0.5 MPa operating pressure, the SAIJ125X300-40 delivers 6136 N of push force and 5734 N of pull force. It can achieve a maximum push force of 11045 N at 0.9 MPa.
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