Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 185mm 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
- Stroke185 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-30
The AirTAC SAIJ125X185-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 155-185 mm usable travel window, allowing you to dial back the nominal 185 mm stroke by up to 30 mm during commissioning. This bore delivers 6136 N push force at 0.5 MPa, making it suitable for heavy actuation tasks.
It uses a PT tapered port thread and includes variable air cushions at both ends to manage kinetic energy. The extruded aluminum barrel incorporates sensor grooves on both sides for CMSE reed or DMSE electronic switches, though this specific SKU ships without a magnet. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 185 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 SAIJ125X185-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×185 | 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 SAIJ125X185-30 Is Used
Machine Setup Changeover
Fine-tune the 155-185 mm end position during product line changeovers without physically replacing the cylinder or adding external mechanical stops.
Heavy Material Clamping
Utilize the 6136 N push force at 0.5 MPa to securely hold heavy workpieces, relying on the adjustable stop to set the exact clamping depth.
Positioning Calibration
Dial in the precise retract distance during initial commissioning, using the 30 mm adjustment window to compensate for mechanical tolerance stack-up.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X185-30 the Right Cylinder?
Select this 125 mm bore when a 63 mm bore (offering 1559 N push at 0.5 MPa) is insufficient for your load, but an 80 mm bore (2513 N) would be excessive. The adjustable stroke is chosen over a fixed SAI cylinder when you need variable end-stops for product changeovers without swapping hardware. For load-holding without continuous air pressure, consider the SAIL or BSAI series instead of relying on the rear stopper. This cylinder is dimensionally interchangeable per ISO 15552 and uses the Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounting set, omitting FB and CA 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 SAIJ125X185-30 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 achieves a push force of 12510 N.
The rear adjuster screw lets you shorten the effective travel from the nominal 185 mm down to 155 mm. This creates a 30 mm usable window for fine-tuning the end position at commissioning, but it functions only as a stop and does not lock the load.
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