Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 700mm 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
- Stroke700 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20
The AirTAC SAIJ40X700-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, letting you dial back the nominal 700 mm travel by up to 20 mm. This yields a usable 680-700 mm end-position window for fine-tuning at commissioning without adding external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, fitting a wide range of standard pneumatic tasks.
This variant features a SUS304 stainless steel rod (code B) for superior corrosion resistance and uses PT tapered port threads. It carries the standard SAI variable air cushions at both ends to decelerate the payload smoothly. Remember that the rear adjuster acts only as a travel stop; it does not hold the load mechanically without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 700 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 SAIJ40BX700-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×700 | 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 SAIJ40BX700-20 Is Used
Machine Setup Tuning
Dial in the exact 680 to 700 mm retract distance during commissioning to perfectly align stops without swapping the cylinder.
Product Changeover
Quickly adjust the end-of-stroke position up to 20 mm on a packaging line when handling slightly different carton sizes.
Conveyor Diverter
Use the fine-tuned travel window to precisely position a diverter gate, relying on the 628 N push force to move loads reliably.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX700-20 the Right Cylinder?
Choose this 40 mm bore when you need more thrust than the 32 mm version (402 N push at 0.5 MPa) but less bulk than a 50 mm cylinder (982 N push). The adjustable stroke is ideal for product changeovers or setup refinement, letting you shift the end-stop by 20 mm directly on the machine. Because the nominal stroke is 700 mm, the 16 mm rod and M12x1.25 thread still require an external guide to prevent excessive side-loading on the seals.
For an exact ISO 15552 replacement, match the 40 mm bore, 700 mm nominal stroke, PT port threads, SUS304 (B) rod material, and the 20 mm adjustment range. Note that this SAIJ model uses a reduced mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2) and omits FB, CA, CB, and CR brackets. If your application requires true load-holding without continuous air pressure, consider the SAIL or BSAI series instead.
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 SAIJ40BX700-20 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw lets you shorten the 700 mm nominal stroke by up to 20 mm, creating a 680-700 mm travel window. This stopper sets the end position but does not lock the load mechanically without air pressure.
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