Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75
The AirTAC Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75 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 SAIJ125X400-75
The AirTAC SAIJ125X400-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that permits up to 75 mm of end-position trimming. This yields a usable travel window of 325 to 400 mm, enabling precise fine-tuning during commissioning without the need to physically swap the cylinder or bolt on external stops. It delivers substantial thrust, generating 6136 N of pull force at 0.5 MPa and up to 11045 N at 0.9 MPa.
The bore utilizes a PT tapered G1/2 port and a robust 32 mm carbon steel piston rod with an M27x2 thread. This larger rod diameter handles greater side loads, though at 400 mm of stroke, an external guide is still recommended for optimal performance. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting set covers Basic, FA, LB, TC, FTC, TCM1, and TCM2 options.
Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75 Technical Specifications
| Model | Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75 |
|---|---|
| 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 SAIJ125X400-75
| 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 SAIJ125X400-75 Is Used
Variable End-Stops
Dial in the exact 325 to 400 mm travel needed for different product sizes without changing the cylinder.
Machine Setup
Fine-tune the retract position during commissioning to align tooling perfectly.
Product Changeover
Quickly adjust the stroke on a packaging line to handle varying carton lengths.
Is the Airtac SAIJ125 Adjustable Cylinder SAIJ125X400-75 the Right Cylinder?
Choose this 125 mm bore when a 100 mm bore (delivering 3681 N pull at 0.5 MPa) lacks the required force, but a 160 mm bore (9425 N pull) would be excessive. The adjustable stroke is ideal for machinery requiring variable end-stops for product size changeovers. The rear adjuster acts purely as a mechanical stop and does not hold the load without live air pressure; for true load-holding, select the SAIL or BSAI series. This cylinder is dimensionally interchangeable per ISO 15552. Configuration: 125 mm bore, 400 mm stroke, 75 mm adjustment, PT G1/2 port, carbon steel rod, no magnet, and standard mounting options.
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 SAIJ125X400-75 FAQ
At 0.5 MPa, it provides 6136 N of pull force and 8590 N of push force. At 0.9 MPa, the push force reaches 11045 N.
The rear adjuster screw lets you shorten the effective stroke by up to 75 mm, creating a usable travel window of 325 to 400 mm for precise end-position tuning.
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