Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20 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 SAIJ125X145-20
The AirTAC SAIJ125X145-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 125-145 mm usable travel window, allowing you to dial back the 145 mm nominal stroke by up to 20 mm during commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy-duty positioning with precision.
This model uses a robust 32 mm carbon steel rod with an M27x2 thread, providing high resistance to side loads. It features PT tapered port threads (G1/2) and dual-sided sensor grooves. The rear adjuster acts purely as a mechanical stop for end-position tuning; it does not lock or hold the load without continuous air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20 |
|---|---|
| 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 SAIJ125X145-20
| 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 SAIJ125X145-20 Is Used
Heavy Pressing Operations
Dial in the exact 125-145 mm travel window required for pressing bearings or pins, ensuring precise force delivery without over-travel.
Product Size Changeovers
Quickly adapt the end-stop position on automated lines when switching between product sizes, using the 20 mm rear adjuster instead of changing cylinders.
Large Material Handling
Leverage the 6136 N push force to move heavy workpieces or pallets, tuning the retract end position to match varying material lengths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X145-20 the Right Cylinder?
Choose this 125 mm bore when you need higher force than the 100 mm bore (3927 N at 0.5 MPa) but want to avoid stepping up to the massive 160 mm bore (10053 N). The 20 mm adjustment range is ideal for fine-tuning end stops during product changeovers, eliminating the need to physically swap out a fixed-stroke SAI cylinder or bolt on external stops.
If your application requires the load to be held securely without live air pressure, note that this cylinder's adjuster and air cushions cannot perform that function. You would need to specify an SAIL (air-released lock) or BSAI (clamp-lock) cylinder instead. For this 145 mm stroke, the 32 mm rod provides excellent rigidity, though any significantly longer unsupported stroke would still require an external guide.
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 SAIJ125X145-20 FAQ
The rear adjuster allows you to mechanically shorten the effective stroke by up to 20 mm, creating a usable travel window of 125 to 145 mm. It acts as a physical stop to fine-tune the end position without altering the cylinder mounting.
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can deliver a maximum of 1251 kgf at 1.0 MPa.
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