Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-50
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-50
The AirTAC SAIJ125X400-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 8590N of push force at 0.7 MPa, utilizing a 32mm carbon steel piston rod with an M27x2 thread. The extruded aluminum barrel includes sensor grooves on both sides, and because no magnet is specified, position sensing requires adding an external switch to a compatible rod if needed.
This model features a 400mm nominal stroke that can be dialed back by up to 50mm, creating a precise 350-400mm usable travel window. The rear stopper allows fine end-position tuning during commissioning or product changeovers without swapping the cylinder. It supports PT tapered ports and operates at speeds of 30-500mm/s, using a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 400 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 SAIJ125X400-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×400 | 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 SAIJ125X400-50 Is Used
Variable End-Stop Positioning
Dial the rear adjuster to shift the 350-400mm travel window, setting exact retract distances for varying material lengths on the fly.
Machine Changeover
Quickly fine-tune the end-of-stroke position during product size changeovers without physically swapping the cylinder or adding spacer blocks.
High-Force Assembly Presses
Leverage the 8590N push force at 0.7 MPa for heavy pressing or joining operations, while the rear screw allows precise depth control.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-50 the Right Cylinder?
Choose this 125mm bore when you need more thrust than the 100mm version (5497N at 0.7 MPa) but less than the heavy 160mm class (14074N). The adjustable 350-400mm travel window is ideal for lines running multiple product sizes, letting operators dial in the exact end-stop without adding external physical stops. Because the 400mm stroke exceeds 300mm, the M27x2 rod will experience higher side loads, so an external guide rail is recommended to prevent binding.
When matching this for an ISO 15552 replacement, verify the 400mm stroke, 50mm adjustment range, PT port threads, and the required mounting accessory from the reduced SAIJ set. Remember that the rear adjuster is a travel stop, not a lock; it cannot hold a load without live air. For fail-safe load holding, consider the SAIL (air-released lock) or BSAI (clamp-lock) variants instead.
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 SAIJ125X400-50 FAQ
At 0.7 MPa operating pressure, this 125mm bore cylinder provides 8590N of push force and 5734N of pull force. At the maximum 1.0 MPa pressure, it can deliver up to 1251 kgf.
The rear adjuster acts as a mechanical stop that lets you shorten the 400mm nominal stroke by up to 50mm, providing a usable travel window of 350-400mm. It only sets the end position and 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 SAIJ125X400-50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.