Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-75 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 SAIJ125X800-75
The AirTAC SAIJ125X800-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a usable travel window of 725 to 800 mm, allowing you to dial back the nominal 800 mm stroke by up to 75 mm during commissioning without adding external stops. It delivers 6136 N of pull force at 0.5 MPa and uses a G1/2 port with a 32 mm carbon steel rod.
This adjustable-stroke design is ideal for product changeovers on large machinery. The rear screw acts as a travel stop for end-position tuning, not a lock, meaning it cannot hold a load without live air pressure. For load-holding requirements, consider the related SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-75 |
|---|---|
| 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 SAIJ125X800-75
| 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 SAIJ125X800-75 Is Used
Large Machine Changeover
Dial in the 725 to 800 mm travel window during product size transitions on heavy production lines without replacing the entire cylinder.
Variable End-Stop Tuning
Use the 75 mm rear adjuster to fine-tune the exact retracted position of large fixtures, accommodating multiple part lengths on the same tooling.
Heavy Assembly Positioning
Leverage the 6136 N pull force to move substantial loads into exact final positions, relying on the adjuster screw to set the precise stopping point.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X800-75 the Right Cylinder?
Choose this 125 mm bore model when your application requires heavy thrust up to 6136 N at 0.5 MPa (or 8590 N at 0.7 MPa). If you need less force, a smaller 100 mm bore offers 3681 N pull at 0.5 MPa. The adjustable 75 mm window is highly beneficial when machine setups require variable end-stops across different product sizes, saving the cost of swapping a fixed-stroke SAI cylinder.
Because this is an 800 mm stroke, the long unsupported piston rod is susceptible to side-loading; an external guide is recommended to prevent premature seal wear. This cylinder uses a PT tapered G1/2 port, a 32 mm carbon steel rod, and supports SAIJ mountings Basic, FA, LB, TC, FTC, TCM1, and TCM2. It lacks a magnet for sensors; adding the -S option enables AirTAC CMSE (reed) and DMSE (solid-state) switches.
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 SAIJ125X800-75 FAQ
At 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of pull force and 8590 N at 0.7 MPa. The maximum push force is 11045 N at 0.9 MPa.
The rear adjuster screw lets you shorten the effective travel from the nominal 800 mm down to 725 mm. It functions as a mechanical stop for end-position tuning and does not lock or hold the load without continuous air pressure.
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