Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40S
The AirTAC SAIJ125X55-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a robust 6136N pull force at 0.5MPa, making it suited for heavy-duty handling. The integrated -S magnet enables position feedback via CMSE reed and DMSE solid-state sensors mounted in the dual-side barrel grooves.
This model provides a usable travel window of 15-55mm, allowing you to dial back the nominal 55mm stroke by up to 40mm. This built-in adjuster acts purely as a mechanical stop to fine-tune the retract end position during commissioning. It does not lock or hold the load without live air pressure; for fail-safe load holding, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 55 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 SAIJ125X55-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×55 | 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 SAIJ125X55-40S Is Used
Press Tonnage Setup
Dials in the exact 15-55mm travel window during heavy-press commissioning to accommodate varying material thicknesses without external stopper blocks.
Product Changeover
Enables rapid retract-position adjustments on automated lines when switching product sizes, leveraging the 6136N pull force for heavy jigs.
Assembly Station Tuning
Provides precise end-stop tuning for heavy component seating tasks, utilizing the built-in magnet for DMSE solid-state sensor feedback.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-40S the Right Cylinder?
Choose this adjustable-stroke cylinder when an installation requires exact end-position tuning without adding external stops or swapping components. If your application needs less force, stepping down to a 100mm bore yields a 3681N pull at 0.5MPa. For higher thrust, a 160mm bore provides 9425N. The SAIJ125X55-40-S uses a PT tapered port and supports a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2. It omits FB, CA, CB, and CR mounts.
Because the stroke is under 300mm, side-load risks are minimal, but the 32mm carbon steel rod still requires proper guiding for long unsupported loads. The rear adjuster and air cushions decelerate the travel ends but are not brakes. This unit is dimensionally interchangeable per ISO 15552 mounting interfaces.
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 SAIJ125X55-40S FAQ
At 0.5MPa, this 125mm bore cylinder provides 6136N of pull force and 8590N of push force. At 0.7MPa, the push force increases to 8590N.
The rear adjuster screw lets you mechanically shorten the 55mm stroke down to a minimum of 15mm. This creates a 15-55mm usable travel window for fine-tuning the retract end position without replacing the cylinder.
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