Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 180mm 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
- Stroke180 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-40
The AirTAC SAIJ125X180-40 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 140 to 180 mm, allowing you to dial back the nominal 180 mm stroke by up to 40 mm during machine commissioning. Delivering 6136 N of push force at 0.5 MPa, it handles heavy loads with precision.
This model uses a carbon steel piston rod and PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for CMSE reed or DMSE electronic switches if a magnet is added later. It supports a speed range of 30-500 mm/s and uses variable air cushions at both ends to decelerate high moving masses smoothly.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 180 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 SAIJ125X180-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×180 | 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 SAIJ125X180-40 Is Used
Product Changeover
Fine-tune the 140 to 180 mm end-stop on packaging lines to accommodate varying carton sizes without changing the cylinder.
Machine Setup
Dial in the exact retract position during initial commissioning, saving time by avoiding mechanical shims or external stop blocks.
Variable End Stops
Adjust the travel distance on heavy-duty material handling presses where the 6136 N output force requires precise positioning.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X180-40 the Right Cylinder?
Choose this 125 mm bore when you need 6136 N push force at 0.5 MPa, stepping up from an 80 mm bore that yields 2513 N. The adjustable 40 mm window is ideal for product changeovers where exact end-position tuning is required without swapping cylinders or adding external stops. For an ISO 15552 replacement match, specify bore 125, stroke 180, adjustment 40, PT port, and the required mounting from the SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
The rear adjuster acts only as a travel stop and does not hold the load without live air pressure. For load-holding without continuous air, consider the SAIL pneumatic lock, BSAI clamp-lock cylinder, or an external pilot-operated check valve. Since the stroke is 180 mm, the 32 mm rod diameter handles moderate side loads, but long unsupported travel still requires 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 SAIJ125X180-40 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 up to 1251 kgf.
The rear adjuster screw lets you reduce the 180 mm nominal stroke by up to 40 mm, creating a 140 to 180 mm usable travel window. It acts as a mechanical stop to set the end position and does not lock the load without live air.
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