Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40S 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 SAIJ125X350-40S
The AirTAC SAIJ125X350-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136N of push force at 0.5 MPa. Its built-in 40mm adjustment screw creates a usable travel window of 310-350mm, letting you dial in the exact retract position during commissioning without swapping hardware. The extruded aluminum barrel features sensor grooves on both sides, and the included -S magnet interfaces directly with AirTAC CMSE reed or DMSE electronic solid-state switches.
Because the 350mm stroke is substantial, the 32mm carbon steel rod and M27x2 rod thread provide necessary rigidity, though an external guide is still recommended for heavy side loads. The rear stopper acts purely as a travel end-deceleration point, not a lock, meaning live air is required to hold the load in place.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40S |
|---|---|
| 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 SAIJ125X350-40S
| 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 SAIJ125X350-40S Is Used
Product Changeover
Quickly adjust the 310-350mm travel window to accommodate different product lengths on the same line without changing the cylinder.
Machine Setup
Fine-tune the retract end-position during initial commissioning to achieve precise tooling alignment without external stop blocks.
Heavy Forming
Leverage the 6136N push force at 0.5 MPa for pressing or forming tasks that require exact bottoming-out depth control.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-40S the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder (2513N push at 0.5 MPa) lacks the thrust for your tooling, but a 160mm bore (10053N) is physically oversized. The adjustable 310-350mm window is ideal for product changeovers on a line, allowing operators to fine-tune the end stop without adding external shims. If your process requires holding a load without continuous air pressure, this cylinder will not suffice; you should instead look at the SAIL (air-released lock) or BSAI (clamp-lock) variants.
For a seamless ISO 15552 replacement, verify your mounting choice falls within the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, or TCM2. This specific SKU is configured with a PT tapered port, standard carbon steel rod, and an -S magnet for position sensing. Operating speed for this bore size 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 SAIJ125X350-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At 0.7 MPa, the push force increases to 8590N.
A rear-mounted screw acts as a mechanical stop, allowing you to shorten the effective stroke from its 350mm nominal length down to 310mm. This adjuster sets the travel end but does not lock the load without live air pressure.
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