Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 375mm 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
- Stroke375 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50S
The AirTAC SAIJ125X375-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 375 mm stroke that can be fine-tuned backward by up to 50 mm, creating a precise 325-375 mm usable travel window for exact end-position calibration. Operating at 0.5 MPa, it delivers 6136 N of push force and 5734 N of pull force, making it suited for heavy-duty positioning tasks.
This variant includes a magnet for CMSE and DMSE sensors and uses a carbon steel rod with an M27x2 thread. The extruded aluminum barrel features sensor grooves on both sides, and the adjustable stopper allows on-the-fly machine adjustments without swapping out the entire cylinder or adding external physical stops.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 375 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 SAIJ125X375-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×375 | 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 SAIJ125X375-50S Is Used
Product Size Changeovers
Dial in the 325-375 mm travel window during line changeovers to accommodate different packaging lengths without mechanical rebuilds.
Heavy-Duty Positioning
Leverage the 6136 N push force to move heavy pallets or fixtures into exact alignment before a secondary clamping action occurs.
Machine Setup Calibration
Fine-tune the retract end-position at commissioning using the rear stopper, ensuring precise seating of large components.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X375-50S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push force at 0.5 MPa) is insufficient, but a 160 mm bore (10053 N) would be excessive. The adjustable 325-375 mm travel window is ideal for production lines handling varying product sizes, allowing operators to dial in the exact retract distance during changeovers. Because the 375 mm stroke is relatively long, an external guide is recommended to prevent excessive side-loading on the M27x2 rod.
To match this exact configuration for an ISO 15552 replacement, specify a 125 mm bore, 375 mm stroke, 50 mm adjustment, PT tapered port thread, and the -S magnet option. Note that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true pneumatic locking, consider the SAIL or BSAI series. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ125X375-50S FAQ
At 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop, allowing you to shorten the effective stroke from 375 mm down to as little as 325 mm. This creates a 50 mm tuning window for precise end-position setup without needing external stops.
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