Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 35mm 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
- Stroke35 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-30S
The AirTAC SAIJ125X35-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers a robust 6136N push force at 0.5MPa, utilizing a 32mm SUS420J2 stainless steel rod. The integrated magnet enables precise position detection with CMSE reed or DMSE electronic sensors. By turning the rear screw, you can fine-tune the effective travel within a 5-35mm usable window, providing exact end-position calibration without adding external stops.
This adjustable-stroke design is ideal for machine setups requiring on-the-fly modifications during product changeovers. It features PT tapered port threads (G1/2) and a variable air cushion at both ends to decelerate the load smoothly. Remember that the rear adjuster acts strictly as a travel stop, not a locking device, so the cylinder cannot hold a load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 35 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 SAIJ125AX35-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×35 | 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 SAIJ125AX35-30S Is Used
Short-Stroke Clamping
Ideal for high-force clamping tasks where the material thickness varies slightly, using the 5-35mm adjustable window to accommodate different part sizes without retooling.
Product Changeover
Enables rapid line changeovers by allowing operators to fine-tune the 35mm stroke end-position on the fly, ensuring precise seating of new components.
End-Stop Calibration
Perfect for assembly stations needing exact actuator endpoints during commissioning, using the rear stopper to dial in the precise travel distance safely.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX35-30S the Right Cylinder?
Choose this 125mm bore when an application demands high thrust, specifically 6136N push and 5734N pull at 0.5MPa. If your setup requires less force, stepping down to a 100mm bore yields 3927N push force, whereas moving up to a 160mm bore provides 10053N. The SAIJ125X35-30-S is selected over a fixed-stroke SAI cylinder when you need a variable end-stop to dial in a 5-35mm travel window during commissioning. Because the stroke is short, side-loading is minimal, but always ensure the load is axially aligned to protect the M27x2 rod thread. For load-holding without continuous air pressure, consider an AirTAC SAIL or BSAI cylinder instead.
To match this ISO 15552 interchangeable cylinder exactly, confirm the 125mm bore, 35mm nominal stroke, 30mm adjustment range, PT port threads, and the -S magnet option. The mounting hardware is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2 configurations, omitting FB, CA, CB, and CR brackets entirely.
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 SAIJ125AX35-30S FAQ
At 0.5MPa operating pressure, this 125mm bore cylinder generates 6136N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9MPa.
The rear adjuster screw allows you to reduce the 35mm nominal stroke by up to 30mm, creating a usable travel window between 5mm and 35mm. This stopper only limits the travel distance; it does not lock the load without continuous air pressure.
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