Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-40 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 SAIJ40BX400-40
The AirTAC SAIJ40X400-40 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 400 mm travel by up to 40 mm for a precise 360-400 mm usable window. Delivering 628 N of push force at 0.5 MPa, it is built with an SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads (G1/4).
Because the adjuster acts purely as a mechanical stop, it decelerates the piston alongside the standard variable air cushions but will not hold the load without live air pressure. The extruded aluminum barrel includes sensor grooves on both sides, and the mounting options cover Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-40 |
|---|---|
| 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 SAIJ40BX400-40
| 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 SAIJ40BX400-40 Is Used
Machine Changeover
Quickly fine-tune the 360-400 mm travel endpoint during product size transitions without bolting on external stops or changing the cylinder.
Variable End Stops
Ideal for diverter gates on a conveyor where the exact actuation position needs slight field adjustments to accommodate different package sizes.
Setup Calibration
Perfect for dialing in the final retract position during initial machine commissioning, ensuring precise alignment before locking down the setup.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX400-40 the Right Cylinder?
Select this 40 mm bore cylinder when an application requires a 628 N push force at 0.5 MPa but needs on-the-fly end-position tuning during commissioning or product changeovers, avoiding the need to physically swap out a fixed-stroke SAI cylinder. If your setup demands greater thrust, stepping up to the 63 mm bore yields 1559 N, while dropping down to the 32 mm bore provides 402 N.
When ordering a replacement, verify the 400 mm stroke, 40 mm adjustment range, PT port thread, and the correct mounting bracket. Note that this configuration uses an SUS304 stainless steel rod and lacks a magnet, so position sensing is not possible without adding the -S option. Since the stroke is 400 mm, the M12x1.25 rod thread and 16 mm rod diameter should be paired with an external guide to prevent excessive side-loading on the piston.
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 SAIJ40BX400-40 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. If operated at 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke from its 400 mm nominal length by up to 40 mm, creating a 360-400 mm travel window. It is a travel stop, not a lock, so it cannot hold the load without continuous air pressure.
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