Airtac SAIJ100 Adjustable Cylinder SAIJ100BX425-20
The AirTAC Airtac SAIJ100 Adjustable Cylinder SAIJ100BX425-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø100mm 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.
- BoreØ100 mm
- Stroke425 mm
- Port sizeG1/2
- Acting typeDouble acting
- Rod threadM20×1.5
- CushionAdjustable, 36 mm
About the Airtac SAIJ100 Adjustable Cylinder SAIJ100BX425-20
The AirTAC SAIJ100X425-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 405-425 mm usable travel window from its 425 mm nominal stroke, allowing you to dial back the retract position by up to 20 mm during commissioning. Equipped with a SUS304 stainless steel rod and PT tapered ports, it delivers a robust 5497 N push force at 0.7 MPa.
This model uses an extruded aluminum barrel with sensor grooves on both sides, designed to accept AirTAC CMSE reed and DMSE electronic sensors if a magnet is added later. The rear adjustment screw acts purely as a travel stop to fine-tune the end position without adding external stops, while the standard variable air cushions at both ends manage deceleration across the 30-800 mm/s speed range.
Airtac SAIJ100 Adjustable Cylinder SAIJ100BX425-20 Technical Specifications
| Model | Airtac SAIJ100 Adjustable Cylinder SAIJ100BX425-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø100 mm |
| Stroke | 425 mm |
| Acting type | Double acting |
| Port size | G1/2 |
| Rod thread | M20×1.5 |
| 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 – 800 mm/s |
| Cushion | Adjustable, 36 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 (Ø100mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 3927 N | 3682 N |
| 0.7 MPa | 5498 N | — |
| Max (@1.0 MPa) | 801 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ100 Adjustable Cylinder SAIJ100BX425-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 100 | 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 SAIJ100 Adjustable Cylinder SAIJ100BX425-20 Is Used
Machine Setup & Changeover
Dial in the exact retract position within a 405-425 mm window during product size changes without swapping the cylinder or adding external stops.
Assembly Line Tuning
Fine-tune the end-of-stroke position on automated assembly stations to accommodate slight variations in incoming part dimensions.
Long-Stroke Material Handling
Move heavy pallets or fixtures with 5497 N of push force at 0.7 MPa while relying on the rear screw to set precise stopping distances.
Is the Airtac SAIJ100 Adjustable Cylinder SAIJ100BX425-20 the Right Cylinder?
Choose this 100 mm bore when a 80 mm bore (providing 3518 N push at 0.7 MPa) is insufficient for your load, but a 125 mm bore is oversized. The adjustable stroke is ideal for product changeovers or fine-tuning machine setup, whereas a fixed SAI cylinder locks you into one exact dimension. To match this ISO 15552 cylinder for replacement, verify the 425 mm stroke, 20 mm adjustment, G1/2 port, and mounting style.
Because the 425 mm stroke is relatively long, the 25 mm diameter piston rod will experience higher bending moments under side loads—always guide the load externally to prevent rod damage. Note that the rear adjuster is a stop, not a lock; the SAIJ will not hold a load without live air, so consider an AirTAC SAIL or BSAI cylinder for true pressure-off holding. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ100 Adjustable Cylinder SAIJ100BX425-20 FAQ
At 0.7 MPa operating pressure, this 100 mm bore cylinder provides 5497 N of push force and 3681 N of pull force. It can reach a maximum push force of 7068 N at 0.9 MPa.
The rear adjuster screw lets you shorten the effective stroke by up to 20 mm, creating a 405-425 mm usable travel window. It functions as a mechanical stop for end-position tuning and does not lock the load without live air pressure.
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