Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 175mm 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
- Stroke175 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20
The AirTAC SAIJ125X175-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a substantial 6136N push force at 0.5 MPa, making it suited for heavy-duty positioning tasks. The integrated rear stopper allows you to trim the nominal 175mm travel back by up to 20mm, creating a precise 155-175mm usable window for fine-tuning the end position without adding external stops.
This model incorporates a 32mm carbon steel piston rod and a PT tapered G1/2 port. It operates at speeds of 30-500mm/s and includes variable air cushions at both ends to manage kinetic energy. The extruded aluminum barrel features sensor grooves on both sides, ready for AirTAC CMSE (reed) or DMSE (solid-state) switches if a magnet is specified later.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 175 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 SAIJ125X175-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×175 | 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 SAIJ125X175-20 Is Used
Machine Changeover
Dial the rear stopper back by up to 20mm to quickly accommodate new product lengths on a packaging line without swapping the cylinder.
Heavy Pressing
Leverage the 6136N thrust at 0.5 MPa to seat heavy components, using the 155-175mm travel window to set the exact contact depth.
Variable End Stops
Fine-tune the retract position during commissioning to clear obstructions, relying on the rear adjuster rather than external stop blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X175-20 the Right Cylinder?
Choose this 125mm bore adjustable-stroke cylinder when your application requires a nominal 175mm travel that must be dialed back for product changeovers or mechanical setup. If your process needs less force, stepping down to a 100mm bore yields 3927N at 0.5 MPa, whereas moving up to a 160mm bore provides 10053N for heavier loads. The rear adjuster acts purely as a travel stop; it does not hold the load without live air pressure. For true load-holding, select a SAIL or BSAI model instead.
As a dimensionally interchangeable ISO 15552 cylinder, this SKU is specified with its 125mm bore, 175mm stroke, 20mm adjustment range, PT G1/2 port, and standard carbon steel rod. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. Because the 175mm stroke is relatively short for this bore, side-load concerns are minimal, but an external guide is still recommended for heavy offset loads.
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 SAIJ125X175-20 FAQ
At a 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
The rear adjuster screw lets you shorten the 175mm nominal stroke by up to 20mm, providing a 155-175mm usable travel window. The adjuster is a mechanical stop, so it sets the end position but does not lock or hold the load without continuous air pressure.
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