Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20 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 SAIJ125AX175-20
The AirTAC SAIJ125X175-20 is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a robust 6136N of push force at 0.5 MPa and features a 20mm adjustment range, yielding a precise 155-175mm usable travel window for fine-tuning end positions during commissioning.
This bore size utilizes a 32mm piston rod with an M27x2 thread to handle substantial side loads, and is built with an SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance. The extruded aluminum barrel incorporates sensor grooves on both sides, allowing for direct mounting of CMSE reed or DMSE electronic switches if position feedback is later required.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20 |
|---|---|
| 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 SAIJ125AX175-20
| 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 SAIJ125AX175-20 Is Used
Product Changeover
Quickly reconfigure the 155-175mm travel window on packaging lines when switching to different carton or pallet sizes without changing the cylinder.
Machine Setup
Fine-tune the exact end-of-stroke position during initial commissioning to perfectly time heavy clamping or pressing operations.
Variable End Stops
Provide adjustable mechanical endpoints for heavy-duty automation equipment requiring flexible positioning within a 20mm range.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX175-20 the Right Cylinder?
Select this 125mm bore when an 80mm bore (delivering 2513N push at 0.5 MPa) lacks the thrust for moving heavy assemblies, but a 160mm bore is physically oversized. The 20mm rear adjuster allows you to dial in the exact retract stop without fabricating external spacers, which is far more efficient than swapping a fixed-stroke SAI cylinder during product size changeovers. When matching an ISO 15552 replacement, verify the 175mm stroke, 20mm adjuster, PT tapered port threads, and the Basic, FA, LB, TC, FTC, TCM1, or TCM2 mounting interface.
Because the 175mm stroke is under 300mm, external guide requirements are less critical than on longer strokes, though the heavy mass still warrants stable mounting. Remember that the rear adjuster functions strictly as a travel stop to set deceleration, not as a locking device; the cylinder cannot hold a load without live air pressure. For true pneumatic load-holding, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125AX175-20 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it delivers up to 1251 kgf.
The rear adjusting screw acts as a mechanical stopper that allows you to shorten the effective stroke by up to 20mm, creating a usable travel window of 155-175mm from the 175mm nominal stroke. It sets the end position but does not lock the load without continuous air pressure.
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