Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30S
The AirTAC SAIJ125X850-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing an 820-850mm usable travel window for precise end-position tuning. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks. This variant includes a SUS420J2 stainless steel rod (code A) for enhanced corrosion resistance and a PT tapered port thread.
Because the nominal 850mm stroke is substantial, the 32mm rod diameter and M27x2 rod thread provide a robust interface, though an external guide is still recommended to manage side loads over this long unsupported distance. The rear adjuster acts purely as a travel stop to fine-tune the retract position during commissioning and does not lock the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAIJ125AX850-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAIJ125AX850-30S Is Used
Heavy-Duty Product Changeover
Dial in the 820-850mm retract position during production line format changes without physically replacing the cylinder or adding external mechanical stops.
Large Assembly Pressing
Utilize the 6136N push force at 0.5 MPa to seat large components, relying on the fine-tuned end-stop to guarantee consistent pressing depth.
Long-Stroke Alignment
Position heavy materials over an 850mm span, using the robust 32mm rod and external guides to handle structural loads while setting precise end limits.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-30S the Right Cylinder?
Choose this 125mm bore when an 80mm bore (providing 2513N push at 0.5 MPa) lacks the thrust for your application, but a 160mm bore (10053N push) would be excessive. The adjustable 820-850mm travel window is ideal for machinery that requires variable end-stops during product changeovers, eliminating the need to physically swap out a fixed-stroke SAI cylinder. For load-holding without continuous live air pressure, this cylinder is insufficient since the rear adjuster is a stop rather than a brake; consider an AirTAC SAIL or BSAI locking cylinder instead.
To match this exact ISO 15552 replacement, specify the 125mm bore, 850mm stroke, 30mm adjustment range, PT port thread, SUS420J2 rod material, and the -S magnet option for CMSE and DMSE sensors. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting FB, CA, CB, and CR configurations.
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 SAIJ125AX850-30S FAQ
At 0.5 MPa, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum operating pressure of 1.0 MPa, it achieves a maximum push force of 11045N.
The rear adjuster screw allows you to trim the effective stroke by up to 30mm, creating an 820-850mm usable travel window. This stopper fine-tunes the end position at commissioning but does not hold the load without live air pressure.
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