Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40S
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40S 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 SAIJ125AX850-40S
The AirTAC SAIJ125X850-40-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It delivers a robust 6136N push force at 0.5 MPa and uses a PT G1/2 port. The integrated -S magnet supports position detection via CMSE reed and DMSE electronic sensors.
With a nominal 850mm stroke and a 40mm adjustment range, the usable travel window is 810-850mm. This allows precise end-position tuning at commissioning without external stops. The SUS420J2 stainless steel rod (code A) offers high corrosion resistance, while the extruded aluminum barrel maintains standard ISO 15552 mounting dimensions.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40S Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40S |
|---|---|
| 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 SAIJ125AX850-40S
| 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 SAIJ125AX850-40S Is Used
Product Changeover
Dial in the 810-850mm travel window during packaging line format changes to accommodate varying carton sizes without swapping hardware.
Machine Setup
Fine-tune the end-stop during commissioning to perfect material press strokes, using the 40mm rear adjustment to dial out mechanical drift.
Variable End Stops
Set precise retract positions on heavy-duty material handling gates where a fixed 850mm stroke would require custom external spacers.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX850-40S the Right Cylinder?
Choose this 125mm bore when 80mm (2513N push at 0.5 MPa) is insufficient but 160mm (10053N) is oversized. The adjustable 810-850mm window is ideal for product changeovers. At 850mm, the 32mm rod diameter handles side loads well, but an external guide is recommended for unsupported lengths.
This cylinder uses the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2), omitting FB/CA/CB/CR. The rear adjuster is a travel stop, not a lock; for load-holding without live air, select SAIL or BSAI.
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 SAIJ125AX850-40S FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. It reaches 11045N push at 0.9 MPa.
The rear adjuster acts as a stopper, allowing you to shorten the effective travel from 850mm down to 810mm. It decelerates the end position but does not lock the load without live air pressure.
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 SAIJ125AX850-40S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.