Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 260mm 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
- Stroke260 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75S
The AirTAC SAIJ40X260-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It delivers 879N of push force at 0.7 MPa and features a 260mm nominal stroke that can be fine-tuned backward by up to 75mm, yielding a usable travel window of 185-260mm. This built-in adjustability allows you to dial in exact end positions during commissioning without adding external stopper blocks.
This specific configuration includes a SUS304 stainless steel rod for superior corrosion resistance and a magnetic piston (-S) for position detection. The extruded aluminum barrel incorporates sensor grooves on both sides, directly accepting AirTAC CMSE reed and DMSE electronic solid-state switches. The rear adjustment screw acts purely as a travel stop to set deceleration, meaning it will not hold a load safely without continuous live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 260 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 SAIJ40BX260-75S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×260 | 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 SAIJ40BX260-75S Is Used
Product Changeover
Quickly adapt end-of-stroke positions for varying package lengths on a packaging line without physically replacing the cylinder.
Commissioning Calibration
Fine-tune the 185-260mm travel window during machine setup to perfectly time the engagement of a delicate picking mechanism.
Variable Diverter Stops
Adjust the retract stop distance on the fly to route different product widths on a conveyor sorting system.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX260-75S the Right Cylinder?
Choose this 40mm bore when an application requires approximately 879N of push force at 0.7 MPa, stepping up from a 32mm bore that provides 563N, or down from a 63mm bore that yields 2182N. The generous 75mm adjustment range is ideal for machines handling frequent product-size changeovers, replacing the need to swap out a fixed-length SAI cylinder. To secure a drop load without live air pressure, you must integrate an external pilot-operated check valve or select an AirTAC SAIL or BSAI locking cylinder, as the SAIJ adjuster is not a brake. For an exact ISO 15552 replacement, match the 40mm bore, 260mm stroke, PT tapered port threads, and -S magnet.
Because the 260mm stroke creates a long unsupported rod extension, external guide rails should be used to prevent side-loading damage to the M12x1.25 rod thread and front seal. This model utilizes the standard SAIJ mounting subset, including Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR brackets.
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 SAIJ40BX260-75S FAQ
The rear adjuster allows you to shorten the effective stroke by up to 75mm. This creates a usable travel window of 185-260mm, letting you set the exact retract end-position without changing the cylinder's physical mounting.
Operating at 0.7 MPa, the SAIJ40X260-75-S generates 879N of push force and 738N of pull force. At a maximum 1.0 MPa operating pressure, it can deliver up to 128 kgf.
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