Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 750mm 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
- Stroke750 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30
The AirTAC SAIJ40X750-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel by up to 30 mm. This yields a usable window of 720 to 750 mm, enabling precise end-position tuning at commissioning without swapping the cylinder or adding external stops. It delivers a push force of 628 N and a pull force of 528 N at 0.5 MPa, making it suitable for medium-duty handling.
This unit is fitted with a SUS304 stainless steel rod for superior corrosion resistance and features PT tapered port threads. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to mount AirTAC CMSE reed or DMSE solid-state switches if a magnet is added later. The rear adjuster acts purely as a mechanical stop to set the travel end and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 750 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 SAIJ40BX750-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×750 | 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 SAIJ40BX750-30 Is Used
Machine Changeover
Dial in the 720-750 mm travel window during product size changes without physically replacing the actuator or re-engineering hard stops.
Variable End Stops
Fine-tune the retraction point on extended-length material handling lines to accommodate varying package lengths.
Commissioning Setup
Trim up to 30 mm of stroke during initial machine commissioning to perfectly sync multiple cylinder endpoints.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX750-30 the Right Cylinder?
Choose this 40 mm bore adjustable-stroke model when your machine setup requires variable end stops or fine-tuning during product changeovers, rather than a fixed-stroke SAI cylinder. If your application demands higher thrust, stepping up to the 50 mm bore yields 982 N of push force at 0.5 MPa. Conversely, scaling down to a 32 mm bore reduces the footprint to 402 N.
Because the 750 mm stroke is long, the 16 mm rod and M12x1.25 thread still require an external guide to prevent side-load damage. To match this exact replacement, specify: 40 mm bore, 750 mm stroke, 30 mm adjustment, PT G1/4 ports, SUS304 (B) rod, and no magnet. For load-holding without live pressure, select the SAIL or BSAI series instead, as the SAIJ adjuster is not a lock. Mounting options are limited to 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 SAIJ40BX750-30 FAQ
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the nominal 750 mm stroke by up to 30 mm. This creates a usable travel window of 720 to 750 mm for fine-tuning end positions at commissioning. The adjuster is a stop, not a lock, and will not hold the load without live air pressure.
At 0.5 MPa, the 40 mm bore provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N. The cylinder operates at speeds between 30 and 800 mm/s.
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