Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-40
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-40 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 SAIJ40BX55-40
The AirTAC SAIJ40X55-40 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to trim the nominal 55 mm travel back by up to 40 mm. This creates a highly flexible 15-55 mm usable window, letting you dial in the exact end-of-stroke position during commissioning without adding external stops. It delivers 628 N of push force at 0.5 MPa and uses a SUS304 stainless steel rod for superior corrosion resistance.
This model features PT tapered port threads and lacks a standard magnet, meaning position sensing via CMSE or DMSE switches is not available out of the box. The rear adjuster acts purely as a mechanical stop to set the retract position, while the integrated air cushions handle end-of-stroke deceleration. Remember that the adjuster is a travel stop, not a lock, so the cylinder cannot hold a load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-40 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-40 |
|---|---|
| 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 SAIJ40BX55-40
| 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 SAIJ40BX55-40 Is Used
Product Changeover Positioning
Rapidly adjust the retract stop from 55 mm down to 15 mm when switching between product sizes on a packaging line, eliminating the need to swap cylinders.
Commissioning End-Tuning
Fine-tune the final resting position during machine setup to achieve perfect alignment, using the rear screw to dial in the exact 15-55 mm travel distance.
Corrosive Environment Actuation
Leverage the SUS304 stainless steel rod for double-acting clamping or pushing tasks in environments where moisture or mild chemicals would degrade standard carbon steel rods.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX55-40 the Right Cylinder?
Choose this 40 mm bore when your application requires 628 N of push force at 0.5 MPa, which sits neatly between the 402 N of a 32 mm bore and the 982 N of a 50 mm bore. An adjustable stroke is highly beneficial for machine setups that undergo frequent product changeovers, allowing you to reposition the end-stop rapidly rather than physically swapping out a fixed-stroke SAI cylinder. If you need true load-holding without continuous air pressure, this standard SAIJ will not suffice, and you should look toward the SAIL or BSAI series instead.
For a seamless ISO 15552 replacement, match your exact parameters: a 40 mm bore, 55 mm stroke, 40 mm adjustment range, PT port threads, SUS304 stainless steel rod material, and no magnet. Because the adjustment range is large relative to the stroke, ensure your mechanical setup accommodates the fully retracted 15 mm position without bottoming out internal components.
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 SAIJ40BX55-40 FAQ
At an operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At the maximum pressure of 1.0 MPa, it can deliver up to 128 kgf.
The rear adjuster screw lets you mechanically shorten the nominal 55 mm stroke by up to 40 mm, creating a usable travel window of 15-55 mm. The adjuster serves as a physical stop to set the end position and does not lock or hold the load without continuous air pressure.
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