Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø125mm bore and 425mm 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
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM27×2
- CushionAdjustable, 40 mm
About the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10
The AirTAC SAIJ125X425-10 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the end position. With a 425 mm nominal stroke and a 10 mm adjustment range, it provides a usable travel window of 415-425 mm. This bore size delivers substantial thrust, offering 6136 N pull force at 0.5 MPa and 8590 N push force at 0.7 MPa.
It features a carbon steel piston rod with an M27x2 thread and PT tapered ports. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement. Because this is a long-stroke application, the 32 mm rod diameter provides robust support, though an external guide is still recommended to manage side loads.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø125 mm |
| Stroke | 425 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 SAIJ125X425-10
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 125 | Bore size in mm. |
| ×425 | 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 SAIJ125X425-10 Is Used
Product Changeovers
Dial in the retract end-position by up to 10 mm during product size transitions without physically swapping the cylinder or repositioning hard stops.
Long-Stroke Assembly
Leverage the 425 mm travel to actuate large fixtures, using the fine adjustment to perfectly seat heavy components under the 8590 N push force.
Commissioning Calibration
Fine-tune the end-of-stroke position during initial machine setup to compensate for mechanical tolerance stack-up across the 415-425 mm window.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-10 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (delivering 3927 N push at 0.5 MPa) is insufficient for your load, but a 160 mm bore (10053 N push at 0.5 MPa) would be excessive overkill. The adjustable stroke is ideal for machine changeovers, allowing you to dial in the exact retract position without adding external mechanical stops.
For a drop-in replacement, match the 425 mm stroke, 10 mm adjustment, PT port thread, and basic mounting interface. Note that SAIJ uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. The rear adjuster acts only as a travel stop and does not hold the load without live air; for position holding, consider the SAIL or BSAI series.
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 SAIJ125X425-10 FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 10 mm, creating a 415-425 mm usable travel window. It acts as a mechanical stop to fine-tune the retract position without changing the cylinder itself.
At 0.5 MPa it provides 6136 N pull and 8590 N push. At 0.7 MPa it delivers 8590 N pull and 11045 N push.
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Standard models usually ship in 3-4 days.
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