Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20
The AirTAC SAIJ125X150-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136N of push force at 0.5 MPa and features a 130-150mm usable travel window, letting you trim the 150mm nominal stroke by up to 20mm during commissioning. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This model uses a PT tapered port thread and a robust 32mm carbon steel rod with an M27x2 thread, providing high rigidity against side loads. The rear adjuster acts purely as a mechanical stop to fine-tune the end position without needing external stops, while the standard variable air cushions handle end-of-stroke deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125X150-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SAIJ125X150-20 Is Used
Variable End Stops
Dial in the exact retraction point within the 130-150mm window for precision machining or clamping tasks without adding external mechanical stops.
Product Changeovers
Quickly adjust the stroke by up to 20mm on packaging lines when switching to different product sizes, minimizing downtime between runs.
Heavy Machine Setup
Leverage the 6136N thrust at 0.5MPa to move heavy fixtures during initial machine commissioning while fine-tuning the final resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20 the Right Cylinder?
Choose this 125mm bore when a 50mm cylinder (982N push at 0.5MPa) lacks thrust or an 80mm cylinder (2513N) is insufficient for heavy product changeovers. The adjustable 130-150mm travel window is perfect for dialing in exact end positions on the fly, avoiding the need to physically swap out a fixed-stroke SAI cylinder when product sizes change. For a direct ISO 15552 replacement, match the 125mm bore, 150mm stroke, PT port, and mounting style.
Because the 150mm stroke is relatively short for this large bore, side-load risks are minimal, but always ensure the load is guided to prevent rod binding. Remember that the rear adjuster is a travel stop, not a locking device; this cylinder cannot hold a load without live air pressure. For load-holding requirements, consider an AirTAC SAIL or BSAI cylinder 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 SAIJ125X150-20 FAQ
The rear adjuster screw allows you to shorten the effective stroke by up to 20mm, creating a usable travel window of 130-150mm. It acts as a mechanical stop to set the end position precisely without swapping cylinders.
At 0.5MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At the maximum 1.0MPa pressure, the push force reaches 1251kgf.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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