Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 165mm 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
- Stroke165 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50S
The AirTAC SAIJ125X165-50-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 115 to 165 mm. It delivers robust thrust, generating 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
This variant features a SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and includes a built-in magnet (-S) compatible with AirTAC CMSE reed and DMSE electronic sensors. It utilizes PT tapered ports and operates within a speed range of 30-500 mm/s, supported by 40 mm air cushions at both ends to manage kinetic energy during travel.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 165 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 SAIJ125AX165-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×165 | 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 SAIJ125AX165-50S Is Used
Variable End-Stop Tuning
Perfect for assembly lines processing multiple product sizes, allowing the retract end-position to be fine-tuned by up to 50 mm via the rear screw during changeovers.
Heavy-Duty Positioning
Leverages 6136 N of push force at 0.5 MPa to move substantial jigs or materials, using the adjustable stroke to perfectly time the contact point without adding external stops.
Sensor-Driven Handling
The integrated magnet works seamlessly with CMSE and DMSE switches in the dual sensor grooves to confirm end-of-stroke positions across the 115 to 165 mm travel window.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX165-50S the Right Cylinder?
Selecting this 125 mm bore model is appropriate when your application requires substantial force, as it outclasses the 80 mm bore that yields 2513 N of push force at 0.5 MPa. The 50 mm adjustment range is ideal for product changeovers, allowing operators to dial in the exact end-stop at commissioning without fabricating external mechanical spacers. For load-holding requirements without live air pressure, note that the rear adjuster functions only as a travel stop; a SAIL or BSAI locking cylinder would be required instead.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 165 mm stroke, 50 mm adjustment range, PT port thread, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, omitting FB, CA, CB, and CR. Because the stroke is under 300 mm, side-load concerns are minimal, though the 32 mm rod diameter and M27x2 thread provide excellent rigidity for offset loads if they do arise.
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 SAIJ125AX165-50S FAQ
At an operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as an external stopper that lets you shorten the effective stroke by up to 50 mm, creating a usable travel window of 115 to 165 mm. It only sets the travel end and does not lock the load without continuous air pressure.
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