Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50S 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 SAIJ125X350-50S
The AirTAC SAIJ125X350-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 6136 N push force at 0.5 MPa and features a built-in magnet for position sensing. The integrated adjuster allows you to fine-tune the effective travel down from the 350 mm nominal stroke, providing a usable window of 300 to 350 mm to dial in exact end positions without external stops.
This bore size uses a G1/2 port and a 32 mm carbon steel rod with an M27x2 thread, providing a robust interface for heavy loads. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to easily mount CMSE reed or DMSE electronic switches along the stroke. Adjustable air cushions at both ends help manage the kinetic energy of this high-thrust mover.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50S |
|---|---|
| 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 SAIJ125X350-50S
| 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 SAIJ125X350-50S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 300-350 mm window during machine commissioning to accommodate varying part dimensions without adding external mechanical stops.
Product Line Changeover
Quickly adjust the end-of-stroke position on packaging or handling equipment when switching between product sizes, reducing downtime compared to replacing fixed-stroke actuators.
Heavy Load Shifting
Leverage the 6136 N push force at 0.5 MPa to move heavy pallets or fixtures, using the rear screw to fine-tune the resting position for precise placement.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X350-50S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder lacks thrust, as stepping up from 80 mm increases push force at 0.5 MPa from 2513 N to 6136 N. The adjustable stroke is ideal for machine setups requiring variable end-stops during product changeovers, eliminating the need to physically swap out a fixed-stroke SAI cylinder. To match this ISO 15552 dimensionally interchangeable cylinder, specify the 350 mm stroke, 50 mm adjustment range, PT tapered port thread, and the -S magnet.
Because the 350 mm stroke is relatively long, the 32 mm rod still requires an external guide to prevent excessive side-loading on the seals. Remember that the rear adjuster acts strictly as a travel stop and does not hold the load without live air; for fail-safe load holding, consider an external rod lock or the AirTAC SAIL locking 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 SAIJ125X350-50S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach up to 11045 N push force at 0.7 MPa.
The rear adjuster screw lets you shorten the 350 mm nominal stroke by up to 50 mm, creating a usable travel window of 300 to 350 mm. This stopper fine-tunes the end position but does not lock the load without continuous air pressure.
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