Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30S 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 SAIJ125AX325-30S
The AirTAC SAIJ125X325-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the 325 mm nominal travel by up to 30 mm for a precise 295-325 mm usable window. It delivers 6136 N of push force at 0.5 MPa, scaling up to 11045 N at 0.9 MPa, making it well-suited for heavy-duty positioning tasks. The integrated -S magnet enables position sensing via AirTAC CMSE reed or DMSE electronic switches fitted into the dual-side sensor grooves.
This variant features a SUS420J2 stainless steel rod (material code A) for improved corrosion resistance and uses PT tapered port threads (G1/2). The rear adjuster functions strictly as a travel stop to fine-tune the end position during commissioning or product changeovers without swapping the cylinder. It is not a locking device, so load-holding without live air requires an external pilot-operated check valve or a related SAIL lock cylinder.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30S |
|---|---|
| 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 SAIJ125AX325-30S
| 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 SAIJ125AX325-30S Is Used
Variable End-Stop Positioning
Dial in the exact retract distance within the 295-325 mm window during machine commissioning to accommodate different material lengths without adding external mechanical stops.
Product Size Changeover
Rapidly adjust the cylinder's effective stroke on packaging or handling lines when switching between different product dimensions, minimizing downtime between production runs.
Heavy-Duty Clamping Setup
Leverage the 11045 N push force at 0.9 MPa to secure heavy workpieces, using the rear adjuster to fine-tune the clamping depth precisely to the workpiece geometry.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX325-30S the Right Cylinder?
Choose this 125 mm bore when a 100 mm cylinder (providing 3927 N push at 0.5 MPa) lacks the thrust for your process, but a 160 mm bore (10053 N at 0.5 MPa) would be physically oversized. The adjustable 295-325 mm travel window is ideal for production lines running mixed product sizes, allowing you to shift the retract end-stop on the fly rather than machining external stopper blocks. Because the stroke is 325 mm, the 32 mm diameter rod and M27x2 thread provide robust support, but an external guide rail is still recommended to prevent excessive side-loading on long extensions.
When specifying an ISO 15552 replacement, match the 125 mm bore, 325 mm stroke, 30 mm adjustment range, PT port threads, and the -S magnet requirement. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options, deliberately omitting FB, CA, CB, and CR brackets. Operating speed for this bore size ranges from 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 SAIJ125AX325-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the 325 mm nominal stroke by up to 30 mm, creating a 295-325 mm usable travel window. It only sets the end position and does not lock the load without live air pressure.
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