Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50 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 SAIJ40BX275-50
The AirTAC SAIJ40X275-50 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 275 mm travel by up to 50 mm. This creates a usable 225-275 mm end-position window, providing fine-tuning flexibility at commissioning without needing external stops or cylinder swaps. It delivers 628 N of push force at 0.5 MPa and features a SUS304 stainless steel rod for superior corrosion resistance.
This model utilizes PT tapered ports and lacks a magnet, meaning position sensing via CMSE or DMSE switches is not supported out of the box. The extruded aluminum barrel includes sensor grooves on both sides, and the rear adjuster functions strictly as a travel stop to set deceleration, not as a lock to hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50 |
|---|---|
| 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 SAIJ40BX275-50
| 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 SAIJ40BX275-50 Is Used
Product Changeovers
Quickly adapt to varying package sizes on a packaging line by dialing in the 225-275 mm stroke window during format changeovers.
End-Position Tuning
Fine-tune the exact extend position during machine commissioning without machining new hard stops or swapping out the entire cylinder.
Variable End Stops
Provide a customizable mechanical stop for assembly presses that need slight positional adjustments across different production runs.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-50 the Right Cylinder?
Choose this 40 mm bore when an application requires approximately 628 N of push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) or down from a 63 mm bore (1559 N) to match your exact load. The 50 mm adjustment range is ideal for product changeovers on a line, allowing operators to variably set the end-stop without replacing the cylinder. For fixed-position tasks without the need for end-tuning, a standard SAI cylinder is sufficient.
Because the nominal stroke is 275 mm, an external guide should be used to support the load and mitigate side-loading on the 16 mm rod. If your process requires the cylinder to hold its position securely without continuous air pressure, note that the SAIJ adjuster is only a stop; you should explore an AirTAC SAIL (pneumatic lock) or BSAI (clamp-lock) cylinder instead. This SAIJ model is dimensionally interchangeable per ISO 15552 and uses a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX275-50 FAQ
The rear adjuster acts as a mechanical stop that allows you to trim the effective stroke back by up to 50 mm from the nominal 275 mm, providing a usable travel window of 225-275 mm. It sets the travel end and works with the air cushion for deceleration, but it does not lock or hold the load without live air pressure.
At a standard operating pressure of 0.5 MPa, the SAIJ40X275-50 provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
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