Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-100 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 SAIJ125AX185-100
The AirTAC SAIJ125X185-100 is a double-acting ISO 15552 profile cylinder equipped with a rear mechanical stopper that allows you to dial back the nominal 185 mm stroke by up to 100 mm. This creates a wide 85 to 185 mm usable travel window, letting you fine-tune the retract end position directly at the machine without adding external stops. Delivering 6136 N of push force at 0.5 MPa, it handles heavy payloads reliably.
This SKU features a SUS420J2 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, though this specific unit lacks the internal magnet required for position sensing. The rear adjuster acts strictly as a travel stop to set the end position, not a lock, so it will not hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-100 |
|---|---|
| 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 SAIJ125AX185-100
| 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 SAIJ125AX185-100 Is Used
Variable End-Stop Positioning
Dial in the exact retract distance from 85 to 185 mm during machine commissioning to accommodate different material thicknesses without changing the cylinder.
Product-Size Changeovers
Quickly adapt a packaging line to new carton dimensions by turning the rear adjuster, eliminating the downtime of physically swapping out fixed-stroke actuators.
Heavy Load Pushing
Leverage the 125 mm bore's 6136 N push force at 0.5 MPa to move heavy assemblies into place, using the wide adjustment range to fine-tune the final resting position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-100 the Right Cylinder?
Choose this 125 mm bore cylinder when your application demands high thrust (6136 N at 0.5 MPa, or up to 1251 kgf at 1.0 MPa) combined with extensive travel flexibility. If you need less force, stepping down to an 80 mm bore yields 2513 N at 0.5 MPa, whereas a 160 mm bore provides 10053 N for heavier loads. The 100 mm adjustment range is particularly valuable for product-size changeovers on a packaging line, replacing the need to physically swap out fixed-stroke SAI cylinders.
To match this ISO 15552 dimensionally interchangeable cylinder, verify your 125 mm bore, 185 mm nominal stroke, 100 mm adjuster, PT G1/2 port, and mounting choice from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Because the stroke is under 300 mm, side-load stress is minimal, but always guide the load on long unsupported extensions. For load-holding without continuous air, select a SAIL or BSAI variant instead.
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 SAIJ125AX185-100 FAQ
A rear stopper screw lets you mechanically shorten the stroke from its 185 mm nominal length by up to 100 mm. This provides a usable travel window of 85 to 185 mm, enabling precise end-position tuning at commissioning without swapping the cylinder.
At 0.5 MPa operating pressure, this double-acting cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
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