Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-40S
The AirTAC SAIJ125X400-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, delivering 8590N of push force at 0.7 MPa. It features a standard carbon steel rod and a built-in magnet (-S) for position sensing. The extruded aluminum barrel includes sensor grooves on both sides, accommodating AirTAC CMSE reed and DMSE electronic solid-state switches for precise end-of-stroke detection.
With a nominal 400mm stroke and a 40mm adjustment range, this SKU provides a usable travel window of 360-400mm. This allows operators to fine-tune the retract end position directly at commissioning or during product-size changeovers without swapping the cylinder or adding external stops. The rear screw acts purely as a travel stop and works alongside the 40mm variable air cushions to decelerate the load; it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125X400-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAIJ125X400-40S Is Used
Product Size Changeovers
Quickly dial in the 360-400mm travel window during format changes on packaging lines, using the rear adjuster to set new end positions without swapping hardware.
Machine Setup Tuning
Fine-tune the retract end-stop during initial commissioning to achieve precise mechanical alignment, leveraging the 8590N force to move heavy fixtures securely.
Variable End Stops
Provide flexible end-positioning on automated assembly equipment where multiple stroke lengths are required from a single cylinder installation.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-40S the Right Cylinder?
Choose this 125mm bore when an 80mm cylinder lacks thrust (the 80mm bore provides 3518N push at 0.7 MPa) or when you need to dial in a specific end-of-stroke position on the fly. The adjustable 360-400mm window is ideal for variable end stops, whereas a fixed-stroke SAI cylinder requires physical shims or external stops for similar tuning. Because the stroke is 400mm, the 32mm rod and M27x2 rod thread provide robust support, but an external guide is still recommended to prevent excessive side-loading on long unsupported travels.
For a true drop-in ISO 15552 replacement, match the 125mm bore, 400mm stroke, 40mm adjustment, PT tapered port thread, and -S magnet. The compatible mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 (omitting FB, CA, CB, and CR). Remember that the adjuster is a stop, not a lock; for load-holding without live air, consider the SAIL or BSAI series 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 SAIJ125X400-40S FAQ
At 0.7 MPa operating pressure, this 125mm bore cylinder provides 8590N of push force and 5734N of pull force. It can reach a maximum push force of 11045N at 0.9 MPa.
The rear adjuster screw allows you to shorten the effective travel from the nominal 400mm down to 360mm, creating a 360-400mm usable window. This stopper sets the end position but does not lock the load without continuous air pressure.
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