Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 50mm 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
- Stroke50 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40
The AirTAC SAIJ125X50-40 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 6136N of push force and 5734N of pull force at 0.5 MPa, placing it firmly in the heavy-duty thrust class. A built-in variable air cushion at both ends decelerates the load before the mechanical stop.
The -40 adjustment code allows you to dial back the nominal 50mm stroke by up to 40mm, creating a precise 10-50mm usable travel window. This fine-tuning at commissioning is achieved without swapping the cylinder or bolting on external stops. It features a SUS420J2 stainless steel rod for enhanced corrosion resistance and uses PT tapered ports.
Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 50 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 SAIJ125AX50-40
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×50 | 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 SAIJ125AX50-40 Is Used
Machine Setup & Changeover
Fine-tune the 10-50mm travel window during product size changeovers without replacing the cylinder or adding external mechanical stops.
Heavy-Duty Variable End Stops
Leverage 6136N of thrust at 0.5MPa to push heavy fixtures, using the rear adjuster to precisely set the retracted position for different assembly jigs.
Commissioning Stroke Tuning
Dial in the exact end-of-stroke position during initial machine commissioning to compensate for mechanical tolerance stack-ups across the fixture.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125AX50-40 the Right Cylinder?
Choose this 125mm bore when a 100mm bore (offering 3927N push at 0.5MPa) is insufficient, but a 160mm bore (10053N) is physically oversized. The adjustable stroke is ideal for product-size changeovers on a line, letting operators set variable end stops on the fly. Remember that the rear adjuster acts purely as a travel stop and does not hold the load without live air; for true fail-safe load holding, consider an AirTAC SAIL or BSAI cylinder. To match this ISO 15552 replacement exactly, specify the 125mm bore, 50mm stroke, 40mm adjustment, PT port, and no magnet.
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 SAIJ125AX50-40 FAQ
At 0.5 MPa operating pressure, this 125mm bore cylinder provides 6136N of push force and 5734N of pull force. At the maximum pressure of 1.0 MPa, it delivers up to 1251 kgf.
The rear adjuster screw acts as a mechanical stop that lets you trim the effective travel back from the 50mm nominal stroke by up to 40mm, yielding a usable 10-50mm window. It only sets the end position and does not lock or hold the load without continuous 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 SAIJ125AX50-40
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.