Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75 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 SAIJ125AX400-75
The AirTAC SAIJ125X400-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a robust 6136N push force at 0.5MPa and allows you to dial back the 400mm nominal stroke by up to 75mm, creating a precise 325-400mm usable travel window for product changeovers. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting of CMSE reed or DMSE electronic switches.
This variant uses a SUS420J2 stainless steel piston rod (material code A) for enhanced corrosion resistance and pairs with PT tapered port threads. The rear adjuster acts purely as a mechanical stop to fine-tune the retract end position without needing external stops, though it does not hold the load without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75 |
|---|---|
| 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 SAIJ125AX400-75
| 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 SAIJ125AX400-75 Is Used
Variable End-Stop Forming
Dial in the exact 325-400mm retract position during machine setup to accommodate different material thicknesses without re-engineering the fixture.
Product Changeover
Quickly adjust the stroke end by up to 75mm when switching the production line to a new package size, minimizing downtime.
Heavy-Duty Clamping
Leverage the 6136N thrust at 0.5MPa to secure large workpieces, using the rear stop to fine-tune the clamp position.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX400-75 the Right Cylinder?
Select this 125mm bore when an 80mm cylinder (providing 2513N at 0.5MPa) lacks the necessary thrust, but a 160mm bore is physically too large. The 75mm adjustment range is ideal for applications requiring variable end-stops during commissioning, replacing the need to swap a fixed-stroke SAI cylinder. To match this ISO 15552 interchangeable unit, specify the 125mm bore, 400mm stroke, PT G1/2 port, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2).
Because the 400mm stroke is substantial, the 32mm diameter rod carries high side loads but still requires an external guide to prevent rod binding. Note that the rear adjuster only sets the travel end; for true load-holding without live air, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ125AX400-75 FAQ
At 0.5MPa operating pressure, it provides 6136N of push force and 5734N of pull force. At 0.9MPa, the push force increases to 11045N.
The rear adjuster screw lets you shorten the effective stroke from 400mm down to 325mm. It functions as a travel stop for end-position tuning, not a lock, so the cylinder requires live air to hold the load.
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 SAIJ125AX400-75
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.