Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50
The AirTAC SAIJ125 Adjustable Cylinder SAIJ125X650-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 650mm stroke, G1/2 air ports and adjustable end cushioning. Its standardized mounting interface makes it interchangeable with other ISO 15552 cylinders at the mounting interface.
- BoreØ125 mm
- Stroke650 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50
The AirTAC SAIJ125X650-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 650 mm stroke by up to 50 mm. This yields a usable travel window of 600 to 650 mm for precise end-position tuning during commissioning.
Featuring a 32 mm carbon steel piston rod with an M27x2 thread, this 125 mm bore unit handles heavy loads effectively. The extruded aluminum barrel incorporates sensor grooves on both sides for flexible CMSE or DMSE switch mounting. It operates at speeds of 30-500 mm/s and includes adjustable air cushions at both ends to manage kinetic energy, though these cushions only decelerate the load and do not hold it without live air pressure.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 650 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 | 5734 N | 5734 N |
| 0.7 MPa | 8027 N | — |
| Max (@1.0 MPa) | 1169 kgf | |
Double-rod model: the rod passes through the rear cover, so both piston faces lose rod area and push is shown at the annular-area value. Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×650 | 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 SAIJ125X650-50 Is Used
Product Size Changeover
Quickly adapt a long-stroke assembly press to different part lengths by dialing the rear adjuster to shift the end-stop within the 600-650 mm window.
Commissioning End-Tuning
Allows maintenance teams to fine-tune the exact retracted position of a heavy fixture during machine setup without fabricating custom spacer blocks.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X650-50 the Right Cylinder?
Select this 125 mm bore cylinder when your application requires high force—stepping down to a 100 mm bore drops the 0.5 MPa push force to 3927 N, while stepping up to a 160 mm bore increases it to 10053 N. The adjustable stroke is ideal for production lines running multiple product sizes, as the rear stopper screw allows you to fine-tune the 600-650 mm travel window without physically swapping the cylinder or adding external stops. Because the 650 mm stroke is substantial and the rod is long, an external guide rail is recommended to prevent excessive side-loading and rod deflection.
For an exact ISO 15552 replacement, match the 125 mm bore, 650 mm stroke, 50 mm adjustment, PT tapered port threads, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that this cylinder does not hold its position without live air; if load-holding is required, consider the SAIL or BSAI series 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 SAIJ125X650-50 FAQ
At 0.7 MPa, the push force increases to 8590 N.
The rear adjuster acts as a mechanical stop that trims the effective travel. For the SAIJ125X650-50, you can shorten the 650 mm nominal stroke by up to 50 mm, creating a usable travel window of 600 to 650 mm to fine-tune the end position without changing the cylinder.
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