Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-10S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-10S 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 SAIJ125AX550-10S
The AirTAC SAIJ125X200-10-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force at 0.5 MPa and provides a usable travel window of 540-550mm, letting you trim the retract end-position by up to 10mm during commissioning. This cylinder includes a SUS420J2 stainless steel rod and a -S magnet for position sensing.
Unlike a fixed-stroke SAI, this model lets you fine-tune the end-stop without swapping the cylinder or adding external stops. The rear adjuster acts purely as a travel stop and relies on the standard air cushions to decelerate the load. For load-holding without live air pressure, you would need a SAIL lock or BSAI clamp-lock cylinder instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-10S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-10S |
|---|---|
| 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 SAIJ125AX550-10S
| 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 SAIJ125AX550-10S Is Used
Machine Setup Tuning
Dial in the exact 540-550mm retract position during initial machine commissioning without machining custom spacers.
Product Changeover
Quickly adjust the end-stop by up to 10mm when switching between slightly different product sizes on the same line.
Heavy Clamping Stations
Leverage the 6136N push force at 0.5 MPa to secure heavy workpieces while fine-tuning the clamping depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-10S the Right Cylinder?
Choose this 125mm bore when a 100mm bore (offering 3927N push at 0.5 MPa) lacks sufficient thrust, but a 160mm bore (10053N) is excessive. The 10mm adjustment range is ideal for applications requiring minor end-position corrections during product changeovers rather than massive travel reductions. To match this ISO 15552 footprint, specify the 125mm bore, 550mm stroke, PT tapered ports, and the -S magnet option.
Because the 550mm stroke is relatively long, the 32mm rod diameter provides robust support, but an external guide is still recommended to prevent excessive side-loading on the unsupported rod. Remember that the rear screw adjuster sets the travel end but does not lock the load. The mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
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 SAIJ125AX550-10S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It can reach up to 11045N push force at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel from the 550mm nominal stroke down to 540mm, giving a 540-550mm usable window. It functions as a mechanical stop to fine-tune the end position and does not hold the load without live air pressure.
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