Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-10 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 850mm 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
- Stroke850 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-10
The AirTAC SAIJ125X850-10 is a double-acting, single-rod ISO 15552 profile cylinder engineered for high-force applications requiring exact end-position tuning. It integrates a rear stopper mechanism that allows you to trim the effective travel, providing a usable stroke window of 840 to 850 mm without swapping out the physical actuator. Delivering 6136 N of push force at 0.5 MPa, this extruded aluminum barrel design is built for heavy-duty industrial deployment.
This model features a robust 32 mm carbon steel piston rod and a PT tapered G1/2 port. The rear adjuster acts strictly as a travel stop to fine-tune the retraction point during commissioning; it is not a locking device and will not hold a load without continuous live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-10 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 850 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 SAIJ125X850-10
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×850 | 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 SAIJ125X850-10 Is Used
Heavy Machinery Changeover
Quickly dial in the 840-850 mm end-stop during product family changeovers on large presses, eliminating the need to physically swap out actuators.
Long-Stroke Positioning
Provides 6136 N of thrust for moving heavy pallets or fixtures, with a 10 mm rear adjustment window to perfect the final retraction point.
Automated Assembly Tuning
Fine-tune the retraction distance during machine commissioning to accommodate varying part dimensions without reprogramming the pneumatic valves.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-10 the Right Cylinder?
Selecting this 125 mm bore actuator makes sense when your application requires the 6136 N thrust available at 0.5 MPa, stepping up from a 100 mm bore that provides 3927 N. The adjustable 10 mm window is ideal for product-size changeovers on a line, allowing operators to dial in the exact end-stop mechanically rather than adding external shims or reverting to a fixed-stroke SAI cylinder. To match this ISO 15552 footprint for a direct replacement, verify the 850 mm stroke, 10 mm adjustment range, PT port threads, and your required mounting accessory from the SAIJ subset (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Because this cylinder features a long 850 mm stroke, the 32 mm rod will experience amplified leverage forces under any side-loading. Even with the standard variable air cushions at both ends, you must use an external guide rail to prevent premature seal wear and rod bending.
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 SAIJ125X850-10 FAQ
At a 0.5 MPa operating pressure, this 125 mm bore cylinder generates 6136 N of push force and 5734 N of pull force. If pressure is increased to 0.7 MPa, the push force rises to 8590 N.
The rear external screw acts as a mechanical stop, allowing you to shorten the 850 mm nominal stroke by up to 10 mm, creating an effective travel window of 840 to 850 mm. It only sets the end position and does not lock the load without live air.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SAI Cylinders
Request a Quote for Airtac SAIJ125 Adjustable Cylinder SAIJ125X850-10
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.