Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 150mm 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
- Stroke150 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20S
The AirTAC SAIJ125X150-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster, yielding a usable travel window of 130-150 mm for precise end-position tuning. It delivers a robust 6136 N push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa. The SUS420J2 stainless steel rod provides high corrosion resistance, while the integrated magnet enables position sensing with CMSE reed and DMSE electronic switches.
Equipped with PT tapered G1/2 ports and variable air cushions at both ends, this model decelerates smoothly. The rear adjuster acts solely as a travel stop and cannot hold a load without live air pressure. It uses the standard SAIJ mounting set, including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 150 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 SAIJ125AX150-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×150 | 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 SAIJ125AX150-20S Is Used
Machine Changeover
Dial in the 130-150 mm travel window during product size transitions without swapping out the entire cylinder assembly.
Variable End-Stop Tuning
Fine-tune the retract position at commissioning using the rear screw, avoiding the need for external mechanical stops.
Heavy Assembly Press
Leverage 6136 N of push force at 0.5 MPa to drive heavy-duty joining operations while precisely controlling the stroke end.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX150-20S the Right Cylinder?
Choose this 125 mm bore when an application requires heavy thrust between the 80 mm bore (2513 N at 0.5 MPa) and the 160 mm bore (10053 N at 0.5 MPa). The adjustable stroke is essential for machine setups requiring variable end-stops or product changeovers, allowing you to dial in the exact 130-150 mm travel without swapping cylinders or adding external stops.
For an exact ISO 15552 replacement, match the 125 mm bore, 150 mm stroke, 20 mm adjustment, PT port thread, and the -S magnet option. Because the adjuster and air cushions only set the travel end and deceleration, select SAIL or BSAI cylinders if your system needs true load-holding without continuous air pressure. Operating speed is 30-500 mm/s.
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 SAIJ125AX150-20S FAQ
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster allows you to shorten the 150 mm nominal stroke by up to 20 mm, creating a 130-150 mm usable travel window. The adjuster acts as a mechanical stop and does not lock the load without live air pressure.
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