Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-50 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 SAIJ125X150-50
The AirTAC SAIJ125X150-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering a robust 6136N push force at 0.5 MPa. By turning the external rear stopper, you can dial back the 150 mm nominal stroke by up to 50 mm, creating a precise 100-150 mm usable travel window. This built-in adjustability allows you to fine-tune end positions at commissioning without swapping out the entire cylinder or adding external stops.
The extruded aluminum barrel features sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches. The 32 mm carbon steel piston rod utilizes an M27x2 thread, and the cylinder operates at speeds of 30-500 mm/s. It uses a PT tapered port thread and offers standard variable air cushions at both ends to manage deceleration across the adjustable travel range.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-50 |
|---|---|
| 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 SAIJ125X150-50
| 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 SAIJ125X150-50 Is Used
Product Changeovers
Dial in the exact extend position from 100 to 150 mm when switching a packaging line to a different carton size, avoiding the need to physically swap cylinders.
Machine Setup
Fine-tune the end-stop during commissioning to perfectly seat heavy components against a backstop without adding external bumpers.
Variable End Stops
Accommodate varying material thicknesses on an assembly line by quickly adjusting the retract stop to set the precise 100-150 mm working distance.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X150-50 the Right Cylinder?
Select this 125 mm bore when an application requires substantial thrust—such as the 6136N push or 5734N pull at 0.5 MPa—but demands a variable end-stop for product changeovers. If your process needs less force, stepping down to an 80 mm bore yields 2513N at 0.5 MPa; if you require more power, a 160 mm bore provides 10053N at 0.5 MPa. The adjustable stroke is ideal for machine setups where the exact extend position varies, whereas a fixed-stroke SAI cylinder is preferred for dedicated, single-product repetitive cycles.
For ISO 15552 replacement matching, pair the 125 mm bore, 150 mm stroke, 50 mm adjustment, PT port thread, and standard carbon steel rod. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2—omitting FB, CA, CB, and CR. Remember that the rear adjuster acts purely as a mechanical travel stop; it does not hold the load without live air. For fail-safe load holding, consider the SAIL (air-released lock) or BSAI (clamp-lock) variants.
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 SAIJ125X150-50 FAQ
The cylinder has a 150 mm nominal stroke, but the external rear adjuster screw lets you mechanically shorten the effective travel by up to 50 mm. This provides a usable travel window of 100-150 mm, allowing you to set the exact end position without adding external stops.
At 0.5 MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At the maximum operating pressure of 1.0 MPa, the push force reaches 12272N.
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