Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 45mm 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
- Stroke45 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30
The AirTAC SAIJ40X45-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the effective travel down by up to 30 mm, creating a highly precise 15-45 mm usable window. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads.
Because the adjuster acts as a retract-end stopper, you can fine-tune the end position during commissioning or product changeovers without swapping out the entire cylinder. Note that this stopper only sets the travel limit; it does not hold the load without live air pressure. For position holding, consider the SAIL or BSAI series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 45 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 SAIJ40BX45-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×45 | 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 SAIJ40BX45-30 Is Used
Changeover Calibration
Dial in the 15-45 mm travel window during product size changeovers to set exact retract positions without machining new external stop blocks.
End-Stop Tuning
Fine-tune the final end position at machine commissioning by adjusting the rear screw, compensating for mechanical tolerance stack-ups.
Short-Stroke Clamping
Utilize the 628 N push force at 0.5 MPa for clamping tasks where the exact grip distance varies slightly between workpieces.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX45-30 the Right Cylinder?
Choose this 40 mm bore when you need more force than the 32 mm variant (402 N at 0.5 MPa) but want to avoid the larger footprint of the 50 mm option (982 N at 0.5 MPa). An adjustable stroke is ideal here because the 15-45 mm travel window allows exact end-position calibration at machine setup, unlike a fixed-stroke SAI cylinder. To match this ISO 15552 replacement, verify the 45 mm nominal stroke, 30 mm adjustment range, PT G1/4 port, and the SUS304 (B) rod material.
Since the nominal stroke is under 300 mm, side-loading is less severe than on long-stroke units, but the 16 mm rod and M12x1.25 thread still require external guidance if subjected to significant lateral loads. The SAIJ mounting set includes Basic, FA, LB, TC, FTC, TCM1, and TCM2 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 SAIJ40BX45-30 FAQ
The rear adjuster screw acts as a mechanical stopper that lets you shorten the 45 mm nominal stroke by up to 30 mm, providing a usable travel window of 15-45 mm. It sets the end position but does not lock the load without live air pressure.
At 0.5 MPa operating pressure, this 40 mm bore double-acting 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.
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