Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30S 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 SAIJ125AX185-30S
The AirTAC SAIJ125X185-30-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and utilizes a PT tapered G1/2 port. The integrated rear screw stopper allows you to fine-tune the effective travel within a 155-185mm window, providing precise end-position calibration during commissioning without adding external stops.
This model includes a magnet for position sensing, supporting AirTAC CMSE reed and DMSE electronic switches. The piston rod is built from SUS420J2 stainless steel for enhanced corrosion resistance. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30S |
|---|---|
| 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 SAIJ125AX185-30S
| 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 SAIJ125AX185-30S Is Used
Machine Setup Calibration
Dial in the exact 155 to 185mm retract position during initial commissioning to perfectly align a heavy sealing head without machining custom spacers.
Product Size Changeover
Quickly adapt the stroke end-stop on a conveyor diverter when switching between different package lengths, saving changeover minutes.
Variable End-Stop Positioning
Trim the travel back by up to 30mm to compensate for mechanical wear in a heavy-duty stamping fixture, ensuring precise bottoming every cycle.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX185-30S the Right Cylinder?
Choose this 125mm bore when a smaller 100mm cylinder (providing 3927N push at 0.5 MPa) lacks thrust, but a larger 160mm bore is unnecessary. The adjustable 155-185mm travel window is perfect for product changeovers on a packaging line, allowing you to dial in the exact retract distance on the fly rather than swapping a fixed-stroke SAI cylinder.
For ISO 15552 replacement matching, ensure you specify the 185mm stroke, 30mm adjustment range, PT G1/2 port, and the -S magnet option. Since the stroke is under 300mm, side-load stress is manageable, but long unsupported loads still require an external guide. Note that SAIJ supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts, omitting FB and CA types. For load-holding without live air, select a SAIL or BSAI cylinder 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 SAIJ125AX185-30S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6134N of push force and 5734N of pull force. It can deliver a maximum push force of 11045N at 0.9 MPa.
The rear adjusting screw allows you to shorten the 185mm nominal stroke by up to 30mm, creating a usable travel window of 155 to 185mm. This stopper only sets the travel end and does not lock the load without continuous air pressure.
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