Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100 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 SAIJ125X400-100
The AirTAC SAIJ125X400-100 is a double-acting ISO 15552 profile cylinder featuring a rear mechanical stroke adjuster. It provides a substantial 6136N pull force at 0.5MPa and uses a PT tapered G1/2 port. The built-in adjuster allows you to fine-tune the effective travel down to a 300-400mm window, giving you precise end-position control without adding external stops.
This 125mm bore unit features a robust 32mm carbon steel rod and an M27x2 thread, handling heavy loads up to 11045N at 0.9MPa. The extruded aluminum barrel includes sensor grooves on both sides for mounting CMSE reed or DMSE electronic switches. It supports a speed range of 30-500mm/s and uses the standard SAIJ mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100 |
|---|---|
| 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 SAIJ125X400-100
| 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 SAIJ125X400-100 Is Used
Variable End-Stop Forming
Dial in the 300-400mm stroke window to accommodate different material lengths in a heavy-duty press or forming operation.
Product Changeover
Quickly adjust the retract position on packaging lines during product size changes without swapping out the entire actuator.
Heavy Assembly Pressing
Leverage the 6136N pull force to seat large components, using the adjustable stop to fine-tune the final pressing depth.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-100 the Right Cylinder?
Choose this adjustable-stroke model when your machine requires variable end-stops for frequent product changeovers. Unlike a fixed-stroke SAI cylinder, the rear screw on this unit lets you dial in the exact 300-400mm travel during commissioning. If you need to step the bore down to a 100mm size, you will see a pull force of 3681N at 0.5MPa.
Because the nominal stroke is 400mm, you must use an external guide to prevent side-loading damage to the 32mm rod. The rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pressure, select a SAIL or BSAI cylinder. This unit is dimensionally interchangeable with ISO 15552 cylinders.
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 SAIJ125X400-100 FAQ
At 0.5MPa it provides 6136N of pull force and 8590N of push force. At 0.9MPa, the push force reaches 11045N.
The rear adjuster acts as a mechanical stop that lets you shorten the effective travel from 400mm down to 300mm. It only sets the end position and does not lock the load without live air pressure.
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