Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30S 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 SAIJ125X50-30S
The AirTAC SAIJ125X50-30-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 6136N push force at 0.5 MPa and features a 50 mm nominal stroke that can be dialed back by up to 30 mm, yielding a 20-50 mm usable travel window for precise end-position tuning. The extruded aluminum barrel includes sensor grooves on both sides, and this -S variant includes a magnet for CMSE reed and DMSE electronic switches.
This 125 mm bore model uses a PT tapered G1/2 port and a 32 mm carbon steel rod with an M27x2 thread, offering robust resistance to side loads. The rear adjuster acts strictly as a mechanical stop for commissioning flexibility, not a lock, and the cylinder omits FB, CA, CB, and CR mounts, utilizing a reduced set of ISO 15552 accessories (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30S |
|---|---|
| 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 SAIJ125X50-30S
| 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 SAIJ125X50-30S Is Used
Variable End Stops
Dial in the exact retract distance during machine setup to accommodate varying material thicknesses without swapping the cylinder.
Product Changeover
Quickly adjust the 20-50 mm travel window on packaging lines when switching to a new product size, minimizing downtime.
Heavy Assembly Clamping
Leverage the 6136N force to securely hold large components during heavy-duty assembly while fine-tuning the final clamp position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X50-30S the Right Cylinder?
Choose this 125 mm bore if your application requires heavy thrust (6136N push, 5734N pull at 0.5 MPa); stepping down to a 100 mm bore drops the push force to 3927N. The adjustable stroke is selected when a fixed SAI cylinder cannot accommodate machine setup or product changeover without adding external stops, letting you fine-tune the retract end within the 20-50 mm window. For load-holding without live air pressure, this plain cylinder is insufficient, as the rear stopper only decelerates travel; you must specify an SAIL air-released lock, a BSAI clamp-lock, or an external pilot-operated check valve. To replace an ISO 15552 cylinder, match the 125 mm bore, 50 mm stroke, 30 mm adjustment, PT G1/2 port, and -S magnet.
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 SAIJ125X50-30S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides a push force of 6136N and a pull force of 5734N. It can deliver up to 11045N push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the 50 mm nominal stroke by up to 30 mm, creating a 20-50 mm adjustable travel window. This mechanical stop fine-tunes the end position at commissioning but does not lock the load without live air pressure.
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Standard models usually ship in 3-4 days.
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