Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 325mm 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
- Stroke325 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50S
The AirTAC SAIJ125X325-50-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 275 to 325 mm, allowing you to dial back the nominal 325 mm stroke by up to 50 mm. Delivering a robust 6136 N push force at 0.5 MPa, this 125 mm bore unit handles heavy positioning tasks. The extruded aluminum barrel includes sensor grooves on both sides, and this -S variant includes a magnet for position detection.
Equipped with a PT tapered G1/2 port and a 32 mm carbon steel rod, the M27x2 rod thread provides substantial mechanical integrity for high-load environments. The rear adjuster acts purely as a mechanical stop to set the retract end-position and works alongside the 40 mm air cushions to control deceleration. It does not hold the load without live air pressure; for fail-safe load holding, consider the SAIL or BSAI series. Compatible sensors include AirTAC CMSE reed and DMSE electronic switches.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 325 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 SAIJ125X325-50S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×325 | 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 SAIJ125X325-50S Is Used
Variable End-Stop Tuning
Dial in the exact retract distance between 275 and 325 mm during machine setup to perfect end-of-stroke positioning without mechanical shims.
Product Size Changeovers
Quickly adapt automated lines to different product lengths by adjusting the stroke stopper up to 50 mm, minimizing downtime between production runs.
Heavy Assembly Positioning
Leverage 6136 N of thrust at 0.5 MPa to move heavy pallets or fixtures into a precise final position, relying on the 40 mm cushion to absorb impact.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X325-50S the Right Cylinder?
Choose this adjustable-stroke model when your application requires fine-tuning the end position during commissioning or accommodating product size changes without physically swapping the cylinder or adding external stops. If you need less force, stepping down to an 80 mm bore yields 2513 N push at 0.5 MPa, while a 160 mm bore provides 10053 N for heavier loads.
Because the 325 mm stroke is substantial, the 32 mm rod resists moderate side loading, but an external guide is strongly recommended for unsupported loads to prevent premature seal wear. To match this ISO 15552 footprint, specify the 125 mm bore, 325 mm stroke, 50 mm adjustment, PT G1/2 port, and the -S magnet. SAIJ supports a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. Operating speed 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 SAIJ125X325-50S FAQ
At 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 lets you shorten the effective travel from the 325 mm nominal stroke down to 275 mm. It functions as a mechanical stop to fine-tune the retract position at commissioning, but it is not a lock and cannot hold the load without continuous air pressure.
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