Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-100
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-100 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 155mm stroke, G1/4 air ports and adjustable end cushioning. Its standardized mounting interface makes it a drop-in replacement for other ISO 15552 cylinders in automation lines.
- BoreØ40 mm
- Stroke155 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-100
The AirTAC SAIJ40X155-100 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to shorten the effective travel. With a nominal 155 mm stroke and a 100 mm adjustment range, it provides a highly flexible 55-155 mm usable travel window for precise end-position tuning at commissioning. Fitted with a SUS304 stainless steel rod and PT tapered port threads, it delivers 628N of push force at 0.5 MPa.
This adjustable-stroke design eliminates the need to swap cylinders or add external stops during product changeovers. The rear adjuster acts strictly as a travel stop to set the retract end, not as a lock, meaning it will not hold the load without live air pressure. For load-holding without continuous air, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-100 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-100 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 155 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 30 mm |
| Max stroke | Up to 1200 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 (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
Actual usable force is lower than theoretical due to friction and back-pressure. Size with a safety margin.
Model Code: Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-100
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×155 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX155-100 Is Used
Machine Setup Changeover
Dial in the exact retract distance between 55 and 155 mm during product size transitions without physically replacing the cylinder or adding external stopper blocks.
Variable End-Stop Positioning
Fine-tune the end-of-stroke position on the fly to accommodate varying material thicknesses or assembly tolerances directly at the machine.
Light-Duty Assembly Pressing
Utilize the 628N push force for precise pressing and seating operations, relying on the rear screw to set the exact travel limit.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX155-100 the Right Cylinder?
Choose this 40 mm bore when you need 628N push force (528N pull) at 0.5 MPa, stepping down from a 63 mm bore (1559N) for lighter tasks, or up from a 32 mm bore (402N) when more thrust is required. The 100 mm adjustment range is ideal for applications requiring variable end-stops or frequent machine setup changes without replacing the cylinder. Since the stroke is under 300 mm, side-load stress on the 16 mm rod is moderate, but an external guide is still recommended for heavy lateral loads. To match this ISO 15552 replacement exactly, verify the 155 mm stroke, 100 mm adjuster, PT G1/4 port, Basic/LB/TC mounting, and SUS304 (B) rod material.
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 SAIJ40 Adjustable Cylinder SAIJ40BX155-100 FAQ
The rear adjuster acts as a mechanical stop that trims the effective travel. For this model, the nominal 155 mm stroke can be dialed back by up to 100 mm, creating a usable travel window of 55-155 mm. The adjuster only sets the end position; it does not lock the load without live air pressure.
At 0.5 MPa operating pressure, the SAIJ40X155-100 provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
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