Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-50 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 SAIJ125AX55-50
The AirTAC SAIJ125X55-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window down to a 5-55 mm range. Delivering 6136 N of push force at 0.5 MPa, it handles heavy positioning tasks with precision. The extruded aluminum barrel includes sensor grooves on both sides, though this specific configuration ships without a magnet.
This unit features an SUS420J2 stainless steel rod (material code A) for enhanced corrosion resistance and uses PT tapered port threads. The rear adjuster functions strictly as a mechanical stop to dial in the end position during commissioning; it does not lock the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-50 |
|---|---|
| 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 SAIJ125AX55-50
| 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 SAIJ125AX55-50 Is Used
Product Changeover
Dial in the exact 5-55 mm end-stop during machine format changes without replacing the cylinder or adding external mechanical stops.
Heavy Clamping
Utilize the 6136 N push force at 0.5 MPa to secure heavy workpieces while fine-tuning the clamping depth at commissioning.
Assembly Pressing
Press components to a precise variable depth using the rear adjuster, ensuring accurate seating without over-travel.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX55-50 the Right Cylinder?
Select this 125 mm bore cylinder when a 100 mm bore (providing 3927 N push at 0.5 MPa) is insufficient, but a 160 mm bore is physically too large. The 50 mm adjustment range is ideal for applications requiring variable end-stops or frequent product-size changeovers without swapping the cylinder. To match this ISO 15552 replacement exactly, verify the 55 mm nominal stroke, 50 mm adjuster, PT port threads, and SUS420J2 rod material.
Because the nominal stroke is under 300 mm, side-load risks are minimized, but ensure the mounting choice from the available SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2) properly supports the load. Note that the FB, CA, CB, and CR mounts are omitted from this series. The operating speed for this bore size ranges from 30-500 mm/s.
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 SAIJ125AX55-50 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder provides 6136 N of push force and 5734 N of pull force. At the maximum 1.0 MPa pressure, it delivers a top push force of 61360 N.
The rear adjuster acts as a mechanical stop that lets you trim the effective travel back from the 55 mm nominal stroke, creating a usable 5-55 mm window. It only sets the end position and does not hold the load without continuous air pressure.
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Covers non-human-caused product damage.
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Standard models usually ship in 3-4 days.
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