Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-40 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 SAIJ125AX550-40
The AirTAC SAIJ125X550-40 is a double-acting ISO 15552 profile cylinder engineered for heavy-duty applications requiring exact end-position tuning. It features a rear-mounted adjusting screw that allows you to shorten the effective stroke, providing a usable travel window of 510 to 550 mm without changing the cylinder or adding external stops. Delivering a robust 6136 N push force at 0.5 MPa, it handles substantial loads with precision.
This model incorporates a SUS420J2 stainless steel rod for superior corrosion resistance and uses PT tapered port threads for a reliable seal. The extruded aluminum barrel includes sensor grooves on both sides, allowing direct mounting of CMSE reed or DMSE electronic switches if a magnet is added later. Operating at speeds of 30-500 mm/s, it is a versatile solution for dynamic, high-force operations.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-40 |
|---|---|
| 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 SAIJ125AX550-40
| 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 SAIJ125AX550-40 Is Used
Machine Setup & Changeover
Fine-tune the 510-550 mm travel window during product size changeovers, eliminating the need to physically swap out long-stroke cylinders on the assembly line.
Variable End-Stop Positioning
Adjust the rear stopper to modify the exact retraction point of heavy pallets or conveyor diverters without altering the fixed mounting infrastructure.
Heavy-Duty Forming Press
Leverage the 6136 N push force at 0.5 MPa for pressing operations while using the 40 mm adjustment range to compensate for material thickness variations.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX550-40 the Right Cylinder?
Selecting this 125 mm bore cylinder makes sense when your application demands the 6136 N thrust at 0.5 MPa (or 8590 N at 0.7 MPa) along with on-the-fly stroke tuning. If your process requires less force, stepping down to an 80 mm bore yields 2513 N push force at 0.5 MPa, whereas moving up to a 160 mm bore provides 10053 N. The adjustable stroke is highly beneficial during commissioning or product changeovers, allowing you to dial in the exact 510-550 mm travel without swapping hardware.
Because the nominal stroke is 550 mm, an external guide is strongly recommended to prevent excessive side-loading on the piston rod. For replacements, match the 125 mm bore, 550 mm stroke, 40 mm adjustment range, PT G1/2 port, and the desired mounting accessory from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that the rear adjuster acts purely as a travel stop and does not hold the load without live air; for true load-holding, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125AX550-40 FAQ
At a standard operating pressure of 0.5 MPa, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. If the pressure is increased to 0.7 MPa, the push force rises to 8590 N.
The rear adjuster allows you to trim the effective travel back by up to 40 mm. This creates a usable stroke window between 510 mm and 550 mm, enabling precise end-position tuning at commissioning without external stops. The adjuster is a stop, not a lock, and requires live air to hold the load.
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