Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 550mm 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
- Stroke550 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30
The AirTAC SAIJ40X550-30 is a double-acting ISO 15552 profile cylinder featuring a rear-mounted stroke adjuster. It provides a nominal 550 mm travel that can be dialed back by up to 30 mm, yielding a precise 520-550 mm usable window. Delivering 628 N of push force at 0.5 MPa, it is built with a SUS304 stainless steel rod and PT tapered ports.
This adjustable stopper lets you fine-tune the retract end-position during commissioning without swapping the cylinder or adding external stops. The rear adjuster acts purely as a travel stop and works alongside the standard 30 mm air cushion to decelerate the load; it does not hold the load without live air pressure. For position holding without air, consider an external rod lock or the AirTAC SAIL series.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 550 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 SAIJ40BX550-30
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×550 | 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 SAIJ40BX550-30 Is Used
Machine Changeover
Dial in the 520-550 mm retract position during product size changes without bolting on external physical stops or changing the cylinder.
Variable End Diving
Fine-tune the pusher end-point on a packaging line by adjusting the rear screw, accommodating different carton depths on the fly.
Commissioning Calibration
Trim the effective stroke by up to 30 mm during initial setup to perfectly align tooling without machining custom spacers.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30 the Right Cylinder?
Choose this 40 mm bore when an application requires 628 N push force at 0.5 MPa, stepping up from a 32 mm bore (402 N) if more thrust is needed, or dropping down from a 50 mm bore (982 N) to save space. The adjustable 520-550 mm window is ideal for machine setups requiring variable end-stops or product changeovers, avoiding the rigid fixed stroke of a standard SAI cylinder.
Because the stroke is 550 mm, the 16 mm rod and M12x1.25 thread should be paired with an external guide to prevent excessive side-loading on the unsupported piston. This model uses PT tapered ports and omits the FB, CA, CB, and CR mounting options, supporting only Basic, FA, LB, TC, FTC, TCM1, and TCM2 brackets. It is dimensionally interchangeable with ISO 15552 cylinders.
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 SAIJ40BX550-30 FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the 550 mm nominal stroke by up to 30 mm, creating a 520-550 mm travel window. It acts as a mechanical stop to set the end position and does not lock the load without live air.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Request a Quote for Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-30
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.