Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50S 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 SAIJ125X800-50S
The AirTAC SAIJ125X800-50-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a nominal 800 mm stroke that can be fine-tuned backward by up to 50 mm, yielding a usable travel window of 750-800 mm. In the 125 mm bore class, it delivers 6136 N of push force at 0.5 MPa and up to 11045 N at 0.9 MPa. The barrel is extruded aluminum with sensor grooves on both sides, and this unit includes a magnet for position sensing.
The integrated rear adjusting screw acts as a mechanical stop to set the retract end position during commissioning without adding external stops. It is not a locking device and will not hold a load without live air pressure. For load-holding without continuous air, consider the SAIL or BSAI series. This model uses a 32 mm carbon steel rod with an M27x2 thread and PT tapered ports. It supports speeds of 30-500 mm/s and features variable air cushions at both ends with 40 mm of cushioning length.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50S |
|---|---|
| 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 SAIJ125X800-50S
| 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 SAIJ125X800-50S Is Used
Product Changeover
Dial in the 750-800 mm retract stop during format changes without physically replacing the cylinder or bolting on external mechanical stops.
Long-Stroke Positioning
Move heavy pallets or actuators along an 800 mm path, using the 50 mm fine-tune window to set the exact end-of-travel location at commissioning.
Adjustable End-Stop Setup
Use the rear adjuster to trim the stroke for varying part sizes on an assembly line, relying on the 11045 N force at 0.9 MPa for pressing tasks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-50S the Right Cylinder?
Choose this 125 mm bore cylinder when an application requires substantial thrust, such as 6136 N at 0.5 MPa, combined with a long 800 mm travel that needs exact end-position tuning. The 50 mm adjustment window is ideal for product changeovers on a line, allowing operators to dial in the retract stop without swapping the cylinder. If less force is needed, stepping down to a 100 mm bore provides 3927 N at 0.5 MPa. Because the stroke is 800 mm, the long unsupported rod requires an external guide to prevent excessive side-loading and premature seal wear.
This SAIJ model is dimensionally interchangeable per ISO 15552 mounting interfaces. When specifying a replacement, match the 125 mm bore, 800 mm stroke, 50 mm adjustment, PT G1/2 ports, and the -S magnet option. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR. The -S magnet works seamlessly with AirTAC CMSE reed and DMSE electronic sensors.
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 SAIJ125X800-50S FAQ
The rear adjusting screw acts as a mechanical stop that lets you trim the effective travel back by up to 50 mm from the 800 mm nominal stroke, giving a usable window of 750-800 mm. It sets the end position but does not lock or hold the load without live air pressure.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. At 0.9 MPa, the push force increases to 11045 N.
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