Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-75S 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 SAIJ40BX275-75S
The AirTAC SAIJ40X275-75-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 275 mm nominal stroke that can be dialed back by up to 75 mm, giving operators a 200-275 mm usable travel window for precise end-position tuning during commissioning. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between smaller 32 mm bores and 50 mm units.
This specific configuration includes a SUS304 stainless steel rod for superior corrosion resistance and a PT tapered port thread. The extruded aluminum barrel features sensor grooves on both sides, and because this is an -S model, it includes a magnet ready for AirTAC CMSE reed and DMSE electronic solid-state switches. The rear adjuster acts purely as a mechanical stop to set the retract position, meaning it does not lock or hold the load without continuous air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-75S |
|---|---|
| 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 SAIJ40BX275-75S
| 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 SAIJ40BX275-75S Is Used
Changeover Calibration
Dial in the 200-275 mm travel window during machine setup to accommodate new product lengths without disassembling the pneumatic rig.
Variable End Stops
Adjust the retract position on the fly for sorting diverters that need to handle varying package sizes on a single line.
Corrosive Positioning
Leverage the SUS304 stainless steel rod for light-duty pushing tasks in washdown or mildly corrosive environments requiring precise stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-75S the Right Cylinder?
Choose this 40 mm bore when 402 N from a 32 mm bore is insufficient, but 982 N from a 50 mm bore is overkill. The 75 mm adjustment range is ideal for machinery handling frequent product-size changeovers, allowing you to shift the end stop without swapping the cylinder or adding external stops. If your application requires the load to be held mechanically without live air pressure, a plain SAIJ is unsuitable; you should instead look at the SAIL (air-released lock) or BSAI (clamp-lock) series.
For an exact ISO 15552 dimensionally interchangeable replacement, match the 40 mm bore, 275 mm stroke, 75 mm adjuster, PT G1/4 port, and -S magnet. With a 275 mm stroke, the 16 mm rod and M12x1.25 thread provide decent side-load capacity, but long unsupported travel still necessitates an external guide to prevent rod binding. The SAIJ mounting set is limited to Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting FB, CA, CB, and CR options.
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 SAIJ40BX275-75S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can deliver up to 1130 N of push force at 0.9 MPa.
A rear mechanical screw stopper lets you shorten the 275 mm nominal stroke by up to 75 mm, creating a 200-275 mm travel window. This adjuster is a stop, not a lock; the cylinder cannot hold a load without live air pressure.
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