Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-30S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-30S
The AirTAC SAIJ125X50-30-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 6136 N of push force at 0.5 MPa. Its 50 mm nominal stroke can be dialed back by up to 30 mm, creating a highly flexible 20-50 mm usable travel window for precise end-position tuning during commissioning. This eliminates the need to swap cylinders or bolt on external stops when aligning heavy loads.
Built for demanding environments, this variant features a SUS420J2 stainless steel rod (material code A) for superior corrosion resistance and includes a magnet (-S) for direct compatibility with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel integrates sensor grooves on both sides, and the PT tapered port threads ensure a robust pneumatic seal for high-flow operations.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-30S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125AX50-30S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125AX50-30S Is Used
Product Changeover
Dial in the 20-50 mm travel window on the fly to accommodate different product heights on a packaging line without changing the actuator.
Heavy Clamping Setup
Leverage the 6136 N push force to secure heavy workpieces, using the rear stopper to fine-tune the exact clamping position during machine commissioning.
End-Stop Calibration
Precisely set the retract end-position in automated assembly machinery, using the 30 mm adjustment range to perfect tool alignment without external stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-30S the Right Cylinder?
Selecting this 125 mm bore makes sense when your application requires the 6136 N push force (at 0.5 MPa) or 8590 N at 0.7 MPa, stepping up from a 100 mm bore that provides 5497 N at 0.7 MPa. The adjustable 20-50 mm travel window is ideal for product-size changeovers on a line, allowing operators to fine-tune the retract end-stop without replacing the actuator. For exact ISO 15552 replacement matching, verify the 50 mm stroke, 30 mm adjustment range, PT port thread, and the required -S magnet.
Because the stroke is under 300 mm, side-load stress on the 32 mm rod is manageable, though external guiding remains best practice for heavy lateral loads. Remember that the rear adjuster functions strictly as a travel stop, not a lock; the cylinder cannot hold a load without live air pressure. For fail-safe load holding, consider an AirTAC SAIL or BSAI series cylinder instead.
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 SAIJ125AX50-30S FAQ
The rear adjuster acts as a mechanical stop that trims the effective travel. With a 50 mm nominal stroke and a 30 mm adjustment code, you can set the actual travel anywhere within a 20-50 mm window. It only limits the retract stroke; it does not lock the load without air pressure.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. If you increase the operating pressure to 0.7 MPa, the push force rises to 8590 N.
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