Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 145mm 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
- Stroke145 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-50S
The AirTAC SAIJ125X145-50-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 95 to 145 mm, allowing you to dial back the nominal 145 mm stroke by up to 50 mm during commissioning without swapping the cylinder or adding external stops. This 125 mm bore generates 6136 N of push force at 0.5 MPa, making it suited for heavy-duty positioning tasks.
This SKU includes a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and features a built-in magnet (-S) for position sensing with AirTAC CMSE reed and DMSE electronic switches. The extruded aluminum barrel includes sensor grooves on both sides, and the variable air cushions at both ends decelerate the load smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 145 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 SAIJ125AX145-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×145 | 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 SAIJ125AX145-50S Is Used
Heavy-Duty Positioning
Provides 6136 N of thrust at 0.5 MPa for moving substantial jigs or fixtures, with the 50 mm adjustment window allowing exact end-stop tuning on the machine bed.
Product Changeover
Quickly adapt the retract stroke from 95 to 145 mm during product size transitions without physically replacing the cylinder or adding external mechanical stops.
Automated Assembly Lines
Integrates seamlessly into ISO 15552 setups using the SUS420J2 stainless steel rod and dual sensor grooves for reliable DMSE electronic position feedback.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX145-50S the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (offering 3927 N push at 0.5 MPa) is insufficient for your load, but a 160 mm bore (10053 N at 0.5 MPa) is physically oversized. An adjustable stroke is ideal for production lines requiring frequent product-size changeovers, letting you fine-tune the retract end-position precisely. The PT tapered porting matches standard imperial pneumatic fittings.
Remember that the rear adjuster acts purely as a travel stop to set deceleration and end-positions; it does not hold the load without live air. For load-holding without continuous pressure, select an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
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 SAIJ125AX145-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. The maximum thrust is 1251 kgf at 1.0 MPa.
The rear adjuster acts as an external stop that trims the effective travel. For this model, the 145 mm nominal stroke can be dialed back by up to 50 mm, creating a usable 95-145 mm travel window for fine-tuning at commissioning. The adjuster is a stop, not a lock, and requires live air to hold the load.
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