Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-30
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 350mm 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
- Stroke350 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-30
The AirTAC SAIJ125X350-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136 N of push force and 5734 N of pull force at 0.5 MPa, utilizing a 32 mm SUS420J2 stainless steel rod with an M27x2 thread. The integrated rear stopper allows you to trim the 350 mm nominal stroke back by up to 30 mm, creating a precise 320-350 mm usable travel window for fine-tuning during commissioning.
This adjustable end-position capability eliminates the need to swap cylinders or bolt on external stops during machine changeovers. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE or DMSE switches, though this specific SKU is supplied without a magnet. It operates at speeds between 30-500 mm/s and features variable air cushions at both ends to manage deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-30 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 350 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 SAIJ125AX350-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×350 | 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 SAIJ125AX350-30 Is Used
Heavy Fixture Positioning
Dial in the exact clamping reach on large machining fixtures using the 320-350 mm travel window without machining new hard stops.
Product Diversion
Adjust the retract distance of a heavy diverter arm on the fly to accommodate different pallet widths running down the line.
Press Stroke Setup
Fine-tune the end-of-stroke contact position for light assembly presses, ensuring precise force delivery without overtravel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX350-30 the Right Cylinder?
Select this 125 mm bore when an 80 mm cylinder (providing 2513 N push at 0.5 MPa) lacks the thrust for moving heavy payloads, but a 160 mm bore (10053 N) would be physically oversized. The SAIJ125X350-30 is chosen over a fixed-stroke SAI when a process requires variable end-stops or exact positioning tweaks at setup. Because the 350 mm stroke is substantial, the unsupported load should be guided externally to prevent excessive side-loading on the M27x2 rod.
For an exact ISO 15552 replacement, match the 125 mm bore, 350 mm stroke, 30 mm adjustment range, PT tapered ports, and the SUS420J2 rod material. Note that while the rear adjuster sets the travel limit, it acts strictly as a stop and does not hold the load without live air. For positive load-holding without pneumatic pressure, 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 SAIJ125AX350-30 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the 350 mm nominal stroke by up to 30 mm. This provides a usable travel window of 320 to 350 mm, which can be fine-tuned during commissioning without changing the cylinder.
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