Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-100S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-100S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 400mm 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
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-100S
The AirTAC SAIJ40X400-100-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It features a SUS304 stainless steel rod and a PT tapered port thread. With a nominal 400 mm stroke and a 100 mm adjustment range, it provides a usable travel window of 300 to 400 mm. This allows you to dial in the exact end position during commissioning without swapping out the cylinder. In the 40 mm bore class, it delivers 628 N of push force at 0.5 MPa.
The integrated magnet supports AirTAC CMSE reed and DMSE electronic sensors housed in the dual-side barrel grooves. Because the rear adjuster acts as a hard stop rather than a locking device, it cannot hold loads without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead. Mounting options are limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-100S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-100S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 400 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 SAIJ40BX400-100S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | 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 SAIJ40 Adjustable Cylinder SAIJ40BX400-100S Is Used
Variable End-Stop Tuning
Dial the retract position back by up to 100 mm during machine setup to hit a new datum without machining new hard stops.
Product Size Changeover
Shift the 300-400 mm travel window to accommodate different package lengths on a packaging line quickly.
Fixture Positioning
Fine-tune clamping locations at commissioning using the rear screw, ensuring precise alignment before locking the settings.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-100S the Right Cylinder?
Choose this 40 mm bore when you need 628 N push at 0.5 MPa, stepping up from the 32 mm bore (402 N) for heavier fixtures, or down from the 50 mm bore (982 N) to save space. The 100 mm adjustment window is ideal for product-size changeovers on a line, letting you set a new retract position externally rather than adding mechanical stops. When matching an ISO 15552 replacement, verify the 400 mm stroke, 100 mm adjuster, PT G1/4 port, and the -S magnet. Since the stroke is 400 mm, an external guide rail is recommended to prevent rod side-load wear.
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 SAIJ40BX400-100S FAQ
At 0.5 MPa it provides 628 N push and 528 N pull force. At 0.7 MPa the push force increases to 879 N.
The rear adjuster screw lets you shorten the nominal 400 mm stroke anywhere down to 300 mm. It acts as a travel stop and does not lock the load without air pressure.
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