Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-40S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-40S 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 SAIJ40BX55-40S
The AirTAC SAIJ40X55-40-S is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, enabling a usable travel window of 15-55 mm from its 55 mm nominal stroke. Delivering 628 N push and 528 N pull force at 0.5 MPa, it handles compact actuation tasks with precision. The integrated -S magnet works seamlessly with CMSE reed and DMSE electronic sensors via the dual-side barrel grooves.
This unit features a SUS304 stainless steel rod for superior corrosion resistance and uses PT tapered port threads. The rear adjustment screw acts purely as a mechanical stop to fine-tune the retract end position during commissioning; it does not lock or hold the load without live air pressure. Mounting options include Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-40S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-40S |
|---|---|
| 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 SAIJ40BX55-40S
| 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 SAIJ40BX55-40S Is Used
Machine Changeover
Dial in the 15-55 mm travel window during format size changes on a packaging line without bolting on external stops.
Variable End Stops
Fine-tune the retract position to accommodate varying product thicknesses, using the rear screw as a precise mechanical stop.
Compact Positioning
Utilize the 628 N push force in tight assembly stations where the 40 mm bore and short stroke provide reliable clamping.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-40S the Right Cylinder?
Choose this 40 mm bore cylinder when you need 628 N of push force at 0.5 MPa and the ability to dial in exact end-stops on the fly, avoiding the need to physically swap cylinders during product changeovers. If your application requires less force, stepping down to a 32 mm bore yields 402 N; for heavier loads, a 50 mm bore provides 982 N. Because the stroke is 55 mm, side-loading risks are minimal, but always ensure standard guide alignment. For load-holding without continuous air pressure, this standard SAIJ is insufficient—consider an AirTAC SAIL or BSAI series instead. Replacement requires matching the 40 mm bore, 55 mm stroke, -40 adjustment, PT G1/4 ports, and -S magnet.
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 SAIJ40BX55-40S FAQ
The rear adjuster screw acts as a mechanical stop, allowing you to shorten the effective stroke from 55 mm down to 15 mm. It sets the travel end position but does not lock or hold the load without live air pressure.
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It features a SUS304 stainless steel rod for high corrosion resistance.
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