Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10S
The AirTAC SAIJ125X550-10-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, providing a usable travel window of 540-550 mm from its 550 mm nominal stroke. It generates 6136 N of push force and 5734 N of pull force at 0.5 MPa, making it suitable for heavy-duty positioning tasks. This variant includes a standard carbon steel rod and a magnet for position sensing.
The rear adjusting screw acts as a mechanical stop to fine-tune the retract end position during commissioning without adding external stops. It is not a locking device, so load holding requires live air or a separate SAIL/BSAI lock. The extruded aluminum barrel features sensor grooves on both sides, and the -S magnet works with AirTAC CMSE reed and DMSE electronic switches for precise end-of-stroke detection.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 550 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 SAIJ125X550-10S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×550 | 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 SAIJ125X550-10S Is Used
Heavy Fixture Positioning
Provides 6136 N of thrust at 0.5 MPa to move heavy machining fixtures, using the 10 mm rear adjuster to dial in the exact retract distance for part clearance.
Product Changeover Stops
Adjusts the end stop by up to 10 mm on packaging conveyors to accommodate slightly different carton lengths without physically swapping the cylinder.
Large Assembly Presses
Handles large component seating in automated assembly presses, relying on the 540-550 mm travel window and robust 32 mm carbon steel rod for reliable actuation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X550-10S the Right Cylinder?
Choose this 125 mm bore cylinder when an 80 mm bore (2513 N push at 0.5 MPa) lacks the thrust for your heavy fixtures, but a 160 mm bore is physically too large. The 10 mm adjustment window is ideal for dialing in exact end stops during product changeovers on a line, whereas a fixed-stroke SAI cylinder would require shimming or swapping to achieve the same precision. Because the stroke is 550 mm, an external guide is recommended to prevent excessive side loading on the 32 mm rod.
To match this ISO 15552 cylinder for a retrofit, confirm the 125 mm bore, 550 mm stroke, 10 mm adjustment, PT tapered port thread, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, intentionally omitting FB, CA, CB, and CR brackets.
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 SAIJ125X550-10S FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. It can reach a maximum push force of 11045 N at 0.9 MPa.
The rear adjuster acts as a mechanical stop that lets you trim the effective stroke back by up to 10 mm, creating a 540-550 mm usable travel window. It sets the end position but does not lock the load without live air pressure.
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