Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 55mm 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
- Stroke55 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30
The AirTAC SAIJ40X55-30 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 25 to 55 mm usable travel window, allowing you to dial back the 55 mm nominal stroke by up to 30 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it bridges the gap between smaller 32 mm bores and 50 mm variants. The extruded aluminum barrel includes sensor grooves on both sides for flexible switch placement.
This specific configuration features a SUS304 stainless steel rod (option B) for superior corrosion resistance. It uses a PT tapered port thread and omits the -S magnet option. The 16 mm rod and M12x1.25 thread provide robust side-load capability, while the rear stopper acts purely as a travel end-deceleration device, not a load lock.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 55 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 SAIJ40BX55-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×55 | 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 SAIJ40BX55-30 Is Used
Component Insertion
Fine-tune the 25-55 mm stroke window during machine setup to press parts accurately without re-engineering the entire pneumatic rig.
Product Changeover
Quickly adjust the retract end-position on packaging lines when switching between different product sizes or thicknesses.
End-Stop Tuning
Dial in the exact 30 mm trim range to compensate for mechanical wear or minor variations in upstream conveyor feeding.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-30 the Right Cylinder?
Choose this 40 mm bore when you need precise variable end-stops for product changeovers without physically swapping cylinders or adding external stops. If your application requires less force, stepping down to a 32 mm bore yields 402 N at 0.5 MPa. For heavier positioning, a 50 mm bore provides 982 N. Remember that a plain SAIJ does not hold its position without live air; the rear adjuster is a stop, not a lock. For true load-holding without pneumatic pressure, consider the SAIL or BSAI series.
To replace an ISO 15552 cylinder, match the 40 mm bore, 55 mm stroke, 30 mm adjustment range, PT port thread, and your required mounting accessory from the SAIJ subset: Basic, FA, LB, TC, FTC, TCM1, or TCM2 (excluding FB, CA, CB, and CR). The 55 mm stroke is well within the 1200 mm standard maximum, so no external side-load guide is strictly necessary for this short travel distance.
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 SAIJ40BX55-30 FAQ
At 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. If you need higher force, a 50 mm bore offers 982 N at the same pressure.
The external rear adjusting screw lets you shorten the effective travel from 55 mm down to 25 mm. This creates a 25-55 mm adjustable window for fine-tuning the retract end-position at commissioning without replacing the cylinder.
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