Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 280mm 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
- Stroke280 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-75
The AirTAC SAIJ40X280-75 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 205 to 280 mm. Delivering 879N of push force at 0.7 MPa, it uses a 16mm carbon steel core but is built here with a SUS304 stainless steel rod (code B) for superior corrosion resistance in washdown or chemically active settings. The extruded aluminum barrel includes sensor grooves on both sides, and the standard variable air cushions at both ends work alongside the rear stopper to decelerate the payload smoothly.
Because the adjustment mechanism acts purely as a mechanical travel stop, it does not hold the load without live air pressure. For true fail-safe load holding, you would need an external rod lock or a related series like SAIL or BSAI. This 40mm bore configuration supplies PT tapered ports and operates at speeds between 30 and 800 mm/s, making it dimensionally interchangeable with ISO 15552 cylinders.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 280 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 SAIJ40BX280-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×280 | 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 SAIJ40BX280-75 Is Used
Machine Changeover
Quickly dial in the 205-280mm travel window during product size changeovers without physically swapping cylinders or adding external stopper blocks.
Variable End-Stop Positioning
Set precise retract end-positions at commissioning using the rear adjustment screw, perfect for varying the resting height of a lifting or pushing assembly.
Corrosive Environment Actuation
Leverage the SUS304 stainless steel rod for packaging or food lines where moisture is present, relying on the 628N force at 0.5 MPa for reliable actuation.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX280-75 the Right Cylinder?
Select this 40mm bore model when an application requires 879N of push force at 0.7 MPa and a highly variable end-position, which is ideal for machine changeovers or accommodating different product sizes on a single line. Instead of swapping a fixed-stroke SAI cylinder during a format change, the rear adjuster lets you dial the stroke back by up to 75 mm on the fly. If you need less force, stepping down to a 32mm bore yields 563N at the same pressure; stepping up to a 50mm bore provides 1374N.
When replacing an ISO 15552 cylinder, match the 40mm bore, 280mm nominal stroke, 75mm adjustment range, PT port thread, and SUS304 rod material. Note that this SKU omits the magnet, so it will not trigger AirTAC CMSE reed or DMSE electronic sensors without adding the -S option. Given the 280mm stroke, the 16mm rod and M12x1.25 thread handle moderate side loads, but long unsupported travel still necessitates an external guide to prevent binding. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR.
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 SAIJ40BX280-75 FAQ
The rear adjusting screw acts as a mechanical stop that lets you shorten the effective stroke by up to 75 mm. This creates a usable travel window between 205 and 280 mm, allowing fine-tuning of the retract end-position at commissioning without replacing the cylinder.
At a 0.7 MPa operating pressure, this 40mm bore cylinder provides 879N of push force and 740N of pull force. It can deliver up to 1130N of push force at its maximum 1.0 MPa pressure.
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