Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-20S 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 SAIJ125X55-20S
The AirTAC SAIJ125X55-20-S is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 35 to 55 mm, allowing you to dial back the 55 mm nominal stroke by up to 20 mm during commissioning without adding external stops. Belonging to the 125 mm bore class, it delivers 6136 N of thrust at 0.5 MPa and incorporates a magnetic piston for position sensing.
This model uses a PT tapered port and a robust 32 mm carbon steel rod with an M27x2 thread, handling high side loads effectively. The extruded aluminum barrel includes sensor grooves on both sides for direct mounting of CMSE reed or DMSE electronic switches. It supports a speed range of 30-500 mm/s and uses variable air cushions at both ends to manage deceleration.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-20S |
|---|---|
| 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 SAIJ125X55-20S
| 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 SAIJ125X55-20S Is Used
Heavy Press Fit Tuning
Dial in the exact 35-55 mm insertion depth for heavy press operations during machine setup without swapping out the entire cylinder.
Product Size Changeover
Quickly adjust the end-stop position on packaging lines when switching between product sizes, using the 20 mm rear adjustment range.
Variable End Stops
Set precise mechanical end limits for high-force forming processes, utilizing the 6136 N thrust capacity and adjustable travel window.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-20S the Right Cylinder?
Select this 125 mm bore cylinder when an application requires heavy thrust up to 6136 N at 0.5 MPa alongside fine-tuned end positioning. The rear adjuster acts purely as a mechanical stop to set the travel window; it does not lock or hold the load without live air pressure. For load-holding requirements without continuous air, consider an external rod lock or the AirTAC SAIL or BSAI series. To replace an ISO 15552 cylinder, match the 125 mm bore, 55 mm stroke, 20 mm adjustment, PT port, and the -S magnet requirement.
Because the 32 mm rod and M27x2 thread provide excellent rigidity, this cylinder handles substantial side loads well, though any unsupported stroke exceeding 300 mm requires an external guide. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR brackets.
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 SAIJ125X55-20S FAQ
The SAIJ125X55-20-S uses a rear adjusting screw to mechanically stop the piston. This creates a usable travel window of 35 to 55 mm, allowing you to trim up to 20 mm off the nominal stroke.
At 0.5 MPa operating pressure, it provides 6136 N of push force and 5734 N of pull force. At 0.7 MPa, the push force increases to 8590 N.
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Standard models usually ship in 3-4 days.
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