Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30S 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 SAIJ40BX275-30S
The AirTAC SAIJ40X275-30-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 245-275mm usable travel window, allowing you to trim up to 30mm off the 275mm nominal stroke during commissioning. This built-in stopper eliminates the need to swap cylinders or add external stops when fine-tuning end positions.
This SKU includes a SUS304 stainless steel rod for superior corrosion resistance and a magnet for position sensing. It is designed to accept AirTAC CMSE reed and DMSE electronic switches along the dual sensor grooves on its extruded aluminum barrel. The PT tapered port is G1/4, and the rod thread is M12x1.25.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30S |
|---|---|
| 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 SAIJ40BX275-30S
| 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 SAIJ40BX275-30S Is Used
Machine Changeover
Dial in the 245-275mm travel window during product size changes to set new retract endpoints without swapping hardware.
Actuator Setup
Fine-tune the final resting position at commissioning using the rear screw, avoiding the need for external stopper blocks.
Variable End Stops
Adjust the retract distance on the fly for delicate material handling tasks requiring precise 40mm bore actuation.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-30S the Right Cylinder?
Choose this 40mm bore when an application requires precise end-position tuning without mechanical rebuilds, offering 528N pull force at 0.5 MPa. If your setup needs less force, stepping down to a 32mm bore yields 402N push force; stepping up to a 50mm bore provides 982N. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air—use an AirTAC SAIL or BSAI cylinder for true pneumatic locking.
To replace an ISO 15552 cylinder, match the 40mm bore, 275mm stroke, 30mm adjustment, G1/4 PT port, and the -S magnet. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2. Since the stroke is 275mm, ensure adequate external guidance to prevent excessive side-loading on the M12x1.25 rod thread.
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 SAIJ40BX275-30S FAQ
At 0.5 MPa, 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, allowing you to shorten the 275mm nominal stroke by up to 30mm, creating a 245-275mm usable travel window. It sets the end position but does not lock the load without air pressure.
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