Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20S 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 SAIJ125X150-20S
The AirTAC SAIJ125X150-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136 N of push force at 0.5 MPa and features a carbon steel rod with an M27x2 thread. The integrated -S magnet enables position detection with AirTAC CMSE reed or DMSE electronic sensors housed in the dual-side extruded barrel grooves.
This specific SKU provides a 150 mm nominal stroke that can be fine-tuned down by up to 20 mm, creating a precise 130-150 mm usable travel window. The rear adjuster acts purely as a mechanical stop to set the retract end position during commissioning; it does not lock the load without live air pressure. It supports a speed range of 30-500 mm/s and uses PT (tapered) G1/2 ports.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20S |
|---|---|
| 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 SAIJ125X150-20S
| 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 SAIJ125X150-20S Is Used
Variable End-Stop Forming
Dial in the exact 130-150 mm retract depth for heavy-duty forming or clamping operations where material thickness varies, using the rear screw to tune the end position without external stops.
Machine Changeover Setup
Quickly adjust the stroke window during product size changeovers on a packaging line, leveraging the 6136 N thrust to handle substantial payloads while fine-tuning the travel limit at commissioning.
Heavy Assembly Positioning
Position large components accurately using the -S magnet and DMSE electronic sensors to confirm stroke ends, relying on the robust M27x2 carbon steel rod to manage significant side loads.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-20S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires heavy thrust (6136 N push at 0.5 MPa) alongside variable end-stop positioning. If you need less force, stepping down to a 100 mm bore yields 3927 N, but this SAIJ model is ideal when dialing in the exact 130-150 mm travel window during machine setup without swapping physical cylinders. To replace an ISO 15552 cylinder, match the 125 mm bore, 150 mm stroke, 20 mm adjustment, PT G1/2 port, and -S magnet requirement.
Mounting options for this adjustable profile cylinder are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. Because the stroke is 150 mm, the M27x2 rod handles side loads well, though any long unsupported overhang still requires an external guide. For applications needing true load-holding without continuous air pressure, consider an AirTAC SAIL or BSAI locking cylinder instead, as the SAIJ adjuster is not a brake.
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 SAIJ125X150-20S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers a maximum push force of 1251 kgf.
The rear adjuster acts as a mechanical stop that allows you to shorten the 150 mm nominal stroke by up to 20 mm, providing a usable travel window of 130-150 mm. It only sets the end position and does not hold the load without live air pressure.
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