Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-75 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 SAIJ40BX275-75
The AirTAC SAIJ40X275-75 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster that allows you to fine-tune the effective travel. With a nominal stroke of 275 mm and a 75 mm adjustment range, this model provides a usable end-position window of 200 to 275 mm without requiring external stops. It delivers 628 N of push force at 0.5 MPa, making it well-suited for moderate-load industrial tasks.
This unit is built with a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch mounting. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2, deliberately omitting FB, CA, CB, and CR configurations.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-75 |
|---|---|
| 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 SAIJ40BX275-75
| 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 SAIJ40BX275-75 Is Used
Machine Setup Changeover
Quickly dial in the 200-275 mm stroke window during product line changeovers to accommodate different package sizes without swapping hardware.
Variable End-Stop Positioning
Provides a precise mechanical stop for diverting items on a conveyor, allowing operators to fine-tune the retraction point on the fly.
Assembly Press Tuning
Ideal for light assembly presses where the 628 N force and a customizable end-position prevent over-travel on delicate components.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX275-75 the Right Cylinder?
Selecting this 40 mm bore cylinder is ideal when you need the 628 N push force at 0.5 MPa but want to avoid stepping up to a 50 mm bore that yields 982 N, or dropping to a 32 mm bore at only 402 N. The adjustable stroke is specifically chosen for applications requiring variable end-stops during commissioning or product changeovers, offering far more flexibility than a fixed-stroke SAI cylinder. To match this ISO 15552 footprint exactly, specify the 40 mm bore, 275 mm stroke, 75 mm adjustment, PT ports, and your required mounting style.
Because the total stroke is 275 mm, the 16 mm rod and M12x1.25 rod thread should be adequately supported to prevent excessive side-loading on long extensions. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for true load-holding without pressure, consider an AirTAC SAIL or BSAI cylinder.
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 SAIJ40BX275-75 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster acts as a mechanical stop that lets you shorten the effective travel from the 275 mm nominal stroke down to as little as 200 mm. It only sets the travel end and does not lock the load without continuous air pressure.
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