Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30S 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 SAIJ125X350-30S
The AirTAC SAIJ125X350-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 320 to 350 mm. Delivering 6136 N of push force at 0.5 MPa, it is built to handle heavy-duty positioning. The extruded aluminum barrel features sensor grooves on both sides, and this -S variant includes a magnet for direct compatibility with AirTAC CMSE reed and DMSE electronic solid-state switches.
Instead of fabricating external stop blocks during product changeovers, the integrated rear screw allows precise end-position tuning without swapping the cylinder. The standard carbon steel rod and M27x2 rod thread provide robust durability, though the generous 350 mm stroke means an external guide is recommended to manage side loads. The rear adjuster acts purely as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30S |
|---|---|
| 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 SAIJ125X350-30S
| 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 SAIJ125X350-30S Is Used
Variable Product Changeover
Dial in the 320-350 mm stroke end-stop on the fly when switching a packaging line between different carton depths, eliminating the need for custom spacer blocks.
Heavy-Duty Machine Setup
Leverage the 6136 N push force at 0.5 MPa to position heavy jigs during initial machine commissioning, using the rear adjuster to fine-tune the resting position.
Precision End-Position Tuning
Trim the effective travel by up to 30 mm to perfectly time the contact point of a heavy stamping or pressing tool without altering the pneumatic plumbing.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-30S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires substantial thrust that exceeds the 3927 N push force of a 100 mm bore at 0.5 MPa, but does not necessitate stepping up to a 160 mm bore. The adjustable 320-350 mm stroke is perfect for lines processing varying product sizes, allowing operators to dial in the exact end-stop without mechanical rework. Because the stroke is 350 mm, supporting the load with an external guide rail is critical to prevent excessive side-loading on the rod.
For an exact ISO 15552 replacement, match the 125 mm bore, 350 mm stroke, PT tapered port threads, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR brackets. If the machine requires true load-holding without continuous air pressure, a standard SAIJ is insufficient; consider an AirTAC SAIL pneumatic lock or BSAI clamp-lock cylinder instead.
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 SAIJ125X350-30S FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 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 effective travel from the nominal 350 mm down to 320 mm. It only sets the end position and does not lock the load without live air pressure.
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