Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 275mm 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
- Stroke275 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30
The AirTAC SAIJ40X275-30 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 628N of push force at 0.5MPa and uses a PT tapered G1/4 port. The built-in adjuster allows you to trim the effective travel back by up to 30mm, creating a precise 245-275mm usable stroke window without needing external stops.
This variant features a SUS304 stainless steel rod for superior corrosion resistance. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE or DMSE switches if a magnet is added later. The rear screw acts purely as a travel stop to fine-tune the end position during commissioning; it does not lock or hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 275 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 SAIJ40BX275-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×275 | 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 SAIJ40BX275-30 Is Used
Machine Changeovers
Dial in the 245-275mm travel window during product size changes without physically replacing the cylinder or adding mechanical shims.
End-Position Tuning
Fine-tune the retract end-stop at commissioning to perfect part ejection or clamping depth directly on the fixture.
Variable Diverter Stops
Adjust the stroke on packaging lines to handle different carton sizes on the fly using the rear stopper screw.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30 the Right Cylinder?
Choose this 40mm bore when an application requires moderate force (628N push at 0.5MPa) and on-the-fly end-position tuning. If your setup demands higher thrust, stepping up to the 50mm bore yields 982N. The adjustable stroke is perfect for product changeovers, letting you dial in the 245-275mm travel window directly at the machine rather than swapping a fixed-stroke SAI cylinder.
For load-holding without continuous air pressure, this cylinder is insufficient as the adjuster is only a stop, not a brake; consider an external pilot-operated check valve or the SAIL lock series. Because the 275mm stroke is relatively long, the 16mm rod should be paired with an external guide to prevent excessive side-loading. This SAIJ model is dimensionally interchangeable per ISO 15552 and supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 mounts.
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 SAIJ40BX275-30 FAQ
At 0.5MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7MPa, the push force increases to 879N.
The rear adjuster screw allows you to shorten the 275mm nominal stroke by up to 30mm, giving a usable travel range of 245-275mm. It functions as a mechanical stop and does not hold the load without air pressure.
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