Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 650mm 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
- Stroke650 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40S
The AirTAC SAIJ40X650-40-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 628N of push force at 0.5 MPa and features a 650mm nominal stroke that can be fine-tuned down by up to 40mm, creating a precise 610-650mm usable travel window. This adjustability allows you to dial in the exact retract end-position during commissioning without swapping out the cylinder or adding external stops.
This SKU is built with a SUS304 stainless steel rod (option B) for superior corrosion resistance and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. It uses a G1/4 port and omits the FB, CA, CB, and CR mounting options, supporting only the Basic, FA, LB, TC, FTC, TCM1, and TCM2 interface set.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 650 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 SAIJ40BX650-40S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×650 | 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 SAIJ40BX650-40S Is Used
Product Changeovers
Quickly modify the 610-650mm travel window to accommodate different product lengths on a packaging line without changing the cylinder.
Commissioning Calibration
Fine-tune the retract end-position during machine setup to achieve precise alignment without fabricating external mechanical stops.
Variable End-Stop Machining
Adjust the stroke on the fly for specialized machining tasks that require slightly different retraction depths between cycles.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX650-40S the Right Cylinder?
Select this 40mm bore cylinder when an application requires a variable retract end-stop rather than a fixed-stroke SAI model, particularly for product-size changeovers on a line. If the 628N push force at 0.5 MPa is insufficient, stepping up to the 50mm bore yields 982N; if less force is needed, the 32mm bore provides 402N. Because the nominal stroke is 650mm, an external guide is recommended to prevent excessive side-loading on the rod.
To match this exact configuration for an ISO 15552 replacement, specify the 40mm bore, 650mm stroke, 40mm adjustment, PT tapered port threads, the SUS304 rod material, the -S magnet option, and a compatible mounting bracket from the reduced SAIJ set. Remember that the rear adjuster functions strictly as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider an external rod lock, a SAIL cylinder, or a BSAI clamp-lock model.
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 SAIJ40BX650-40S FAQ
At 0.5 MPa operating pressure, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N.
The rear adjuster acts as a mechanical stop that allows you to shorten the effective stroke by up to 40mm. This creates a usable travel window between 610mm and 650mm, enabling fine-tuning of the end position without replacing the cylinder.
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