Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-75
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-75 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 75mm 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
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-75
The AirTAC SAIJ40X75-75 is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It delivers 628N of push force at 0.5 MPa and provides a highly flexible usable travel window of 0 to 75mm. This wide adjustment range allows you to dial in the exact end position during commissioning without swapping hardware.
Equipped with a SUS304 stainless steel rod and PT tapered port threads, this unit handles demanding environments. It utilizes variable air cushions at both ends to decelerate the load smoothly. Remember that the rear stopper sets the travel limit but does not lock the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-75 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-75 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 75 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 SAIJ40BX75-75
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×75 | 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 SAIJ40BX75-75 Is Used
Variable End-Stop Tuning
Dial in the exact retraction point from 0 to 75mm during machine setup to accommodate different product sizes without machining new hard stops.
Changeover Adjustments
Quickly reconfigure the stroke length on packaging lines for various carton formats, using the rear screw to set the precise travel limit.
Commissioning Calibration
Fine-tune the final end position during installation to achieve perfect alignment, avoiding the need to physically swap out a fixed-stroke cylinder.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX75-75 the Right Cylinder?
Choose this 40mm bore when an application requires precise positioning within a 0-75mm window, saving the need for external stops. If you need less force, stepping down to a 32mm bore yields 402N at 0.5 MPa. For heavier loads, a 50mm bore provides 982N. Because the stroke is under 300mm, side-load stress is minimal, though an external guide is still recommended for optimal piston life.
When ordering a replacement, verify the 75mm adjustment code, PT port type, SUS304 rod material, and the reduced SAIJ mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that FB, CA, CB, and CR mounts are omitted. For load-holding without air pressure, consider the SAIL or BSAI series instead of relying on this adjuster.
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 SAIJ40BX75-75 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 stopper that allows you to trim the effective travel back by up to 75mm, creating a 0 to 75mm usable window. It sets the end position but does not hold the load without live air.
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