Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-100S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-100S 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 SAIJ125AX800-100S
The AirTAC SAIJ125X800-100-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel by up to 100 mm. This creates a precise 700-800 mm usable stroke window, enabling fine end-position tuning at commissioning or during product changeovers without swapping the cylinder or adding external stops. It delivers substantial thrust, providing 8590 N of pull force at 0.7 MPa.
This model includes a SUS420J2 stainless steel rod (option A) for enhanced corrosion resistance and features a built-in magnet (-S) for use with CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides. It supports a speed range of 30-500 mm/s and uses PT tapered port threads (G1/2).
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-100S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-100S |
|---|---|
| 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 SAIJ125AX800-100S
| 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 SAIJ125AX800-100S Is Used
Variable End-Stop Machining
Dial in the exact 700-800 mm retract position for machining stations without repositioning the cylinder mount.
Product Changeover
Quickly adapt automated lines to new product sizes by adjusting the rear stopper up to 100 mm during setup.
Commissioning Fine-Tuning
Trim the stroke precisely during machine commissioning to avoid crashing heavy tooling into hard stops.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX800-100S the Right Cylinder?
Choose this 125 mm bore cylinder when an application demands high force combined with variable end-stop positioning. If you need less thrust, stepping down to the 100 mm bore yields 5497 N push force at 0.7 MPa, but the 125 mm bore is preferred for heavy loads. The adjustable stroke is ideal for machine setups requiring exact retract distances without mechanical rework. For load-holding without live air pressure, note that this cylinder's rear adjuster acts only as a travel stop, not a lock; consider an AirTAC SAIL or BSAI series cylinder for those requirements.
When replacing an ISO 15552 cylinder, match the 125 mm bore, 800 mm nominal stroke, 100 mm adjustment range, PT G1/2 port, and the -S magnet option. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Because the 800 mm stroke is long and generates high forces, an external guide is recommended to prevent excessive side-loading on the piston rod.
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 SAIJ125AX800-100S FAQ
The rear adjuster screw acts as a mechanical stop that lets you shorten the nominal 800 mm stroke by up to 100 mm, providing a usable travel window of 700-800 mm. The adjuster and the air cushion only set the travel end and deceleration; they do not hold the load without live air pressure.
At 0.7 MPa operating pressure, it provides 8590 N of pull force and 11045 N at 0.9 MPa. The maximum push force is 1251 kgf at 1.0 MPa.
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