Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-20
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-20 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 SAIJ125X425-20
The AirTAC SAIJ125X425-20 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a 425 mm nominal stroke that can be dialed back by up to 20 mm, creating a precise 405-425 mm usable travel window for commissioning. Belonging to the 125 mm bore class, it delivers 6136 N of pull force at 0.5 MPa and up to 11045 N at 0.9 MPa.
This made-to-order unit uses a standard carbon steel piston rod and PT tapered port threads. It supports speeds of 30-500 mm/s and includes variable air cushions at both ends. The extruded aluminum barrel integrates dual sensor grooves, allowing you to fit CMSE reed or DMSE solid-state switches exactly where the application demands.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-20 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-20 |
|---|---|
| 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 SAIJ125X425-20
| 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 SAIJ125X425-20 Is Used
Machine Changeover
Dial in the 405-425 mm retract position during product size changes without disassembling the line or adding external mechanical stops.
Heavy Pressing
Leverage the 11045 N push force at 0.9 MPa for heavy-duty forming or pressing tasks that require precise end-of-stroke contact tuning.
Long-Stroke Indexing
Move large pallets or heavy tooling bases over a 425 mm travel path, using the rear screw to absorb mechanical tolerance variations at setup.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X425-20 the Right Cylinder?
Choose this 125 mm bore when your process requires heavy push forces up to 8590 N at 0.7 MPa, stepping up from a 100 mm bore that provides 5497 N. The adjustable stroke is ideal for product changeovers, letting you fine-tune the retract end-position without swapping the cylinder or adding external stops. Remember that the rear adjuster acts only as a travel stop; it does not hold the load without live air. For dead-load holding, select an AirTAC SAIL or BSAI cylinder.
Because the 425 mm stroke is non-standard, expect a made-to-order lead time. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR options. For an ISO 15552 replacement, match the 125 mm bore, 425 mm stroke, 20 mm adjustment, G3/8 port, and desired mounting. Since the stroke exceeds 300 mm, the 32 mm rod will experience leverage on long unsupported loads, so an external guide is recommended to prevent side-loading damage.
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 SAIJ125X425-20 FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 20 mm, providing a 405-425 mm travel window. It acts as a mechanical stop to fine-tune the end position at commissioning, but it is not a lock and will not hold the load without continuous air pressure.
At 0.5 MPa, it provides 6136 N of push force and 5734 N of pull force. If you increase the operating pressure to 0.9 MPa, the push force reaches 11045 N.
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