Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 800mm 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
- Stroke800 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20S
The AirTAC SAIJ125X800-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that trims the effective travel to a 780-800 mm window. It delivers 6136 N of push force and 5734 N of pull force at a 0.5 MPa operating pressure, making it suited for heavy-duty positioning. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed and DMSE electronic switches.
Equipped with a SUS420J2 stainless steel rod and PT tapered port threads, this unit resists corrosion while providing secure pneumatic connections. The rear adjustment screw acts purely as a mechanical stop to fine-tune the end position during commissioning; it is not a lock, so live air pressure is required to hold the load. For applications needing static holding without air, consider the SAIL or BSAI series.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 800 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 SAIJ125AX800-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×800 | 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 SAIJ125AX800-20S Is Used
Variable End-Stop Positioning
Dial in the exact 780 to 800 mm travel distance on a conveyor diverter without physically replacing the cylinder during product size changes.
Heavy-Duty Machine Setup
Fine-tune the retract end-position during initial commissioning of a large press, utilizing the 6136 N push force to move substantial tooling.
Changeover Adjustment
Quickly adapt the stroke window for new part dimensions on an automated assembly line using the rear 20 mm adjustment screw.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-20S the Right Cylinder?
Choose this 125 mm bore when you need significantly more thrust than the 80 mm bore (2513 N push at 0.5 MPa) provides, but less than the massive 160 mm bore (10053 N). The 20 mm adjustable end-stop is ideal for product changeovers on a line, allowing you to dial in the exact travel distance without swapping out the entire cylinder or adding external stops. Because the nominal stroke is 800 mm, the long unsupported rod requires an external guide to prevent excessive side-loading and premature seal wear.
To match this cylinder for an ISO 15552 replacement, verify the 125 mm bore, 800 mm stroke, 20 mm adjustment range, PT port threads, and the -S magnet option. The SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR styles found in some standard tie-rod catalogs.
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 SAIJ125AX800-20S FAQ
At a 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 can deliver up to 1251 kgf.
The rear adjuster screw allows you to shorten the nominal 800 mm stroke by up to 20 mm, creating a usable travel window of 780 to 800 mm. The adjuster acts as a mechanical stop and does not lock the load without live air pressure.
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