Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-20 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 SAIJ125X55-20
The AirTAC SAIJ125X55-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling you to dial back the nominal 55 mm stroke by up to 20 mm. This yields a precise 35-55 mm usable travel window, allowing you to fine-tune end positions during commissioning without bolting on external stops or swapping the cylinder. It delivers a robust 6136 N pull force at 0.5 MPa, making it well-suited for heavy-duty positioning tasks.
The rear adjuster functions purely as a mechanical stop to set the travel end and works in tandem with the variable air cushions at both ends; it is not a lock and will not hold the load without live air pressure. For load-holding without continuous air, you would need a related type like the SAIL or BSAI. This 125 mm bore unit features a 32 mm carbon steel piston rod, a PT tapered port, and operates at speeds of 30-500 mm/s. It supports a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-20 |
|---|---|
| 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 SAIJ125X55-20
| 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 SAIJ125X55-20 Is Used
Machine Setup Tuning
Dial in the exact 35-55 mm end position during commissioning to perfect a heavy clamping operation without machining custom external stoppers.
Product Size Changeover
Quickly adapt the cylinder stroke on packaging lines handling varying product lengths by adjusting the rear screw during format changeovers.
Heavy-Duty Positioning
Leverage the 6136 N pull force to shift heavy pallets or fixtures, relying on the rear stop to consistently set the precise retraction point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X55-20 the Right Cylinder?
Choose this 125 mm bore if your application requires substantial thrust—such as the 6136 N pull force at 0.5 MPa—exceeding the 3927 N pull capacity of the smaller 100 mm bore. The adjustable stroke is ideal for machine setups requiring variable end-stops or product-size changeovers, providing setup flexibility that a fixed-stroke SAI cylinder cannot offer. Because the stroke is 55 mm, no external side-load guide is strictly necessary, though the 32 mm rod provides excellent rigidity. If you need to hold a load securely without live air pressure, this cylinder's adjuster will not suffice; consider the SAIL or BSAI series instead. To match this ISO 15552 replacement, verify your 125 mm bore, 55 mm stroke, 20 mm adjustment, PT port, and required mounting interface.
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 SAIJ125X55-20 FAQ
At a 0.5 MPa operating pressure, the 125 mm bore generates a push force of 6136 N and a pull force of 5734 N. At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster allows you to shorten the nominal 55 mm stroke by up to 20 mm, creating a usable travel window of 35 to 55 mm. The adjuster acts as a mechanical stop to fine-tune the retraction end position and is not a locking mechanism.
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