Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-75S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-75S 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 SAIJ40BX550-75S
The AirTAC SAIJ40X550-75-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 628N push force at 0.5 MPa and features a 16mm piston rod with an M12x1.25 thread. By turning the rear stopper screw, you can fine-tune the effective travel down from the 550mm nominal stroke, yielding a usable window of 475-550mm without adding external stops.
This SKU includes a SUS304 stainless steel rod (option B) for corrosion resistance and a built-in magnet for position sensing with AirTAC CMSE reed or DMSE solid-state switches. It uses PT tapered ports sized G1/4 and operates at speeds from 30-800 mm/s. The mounting interface supports Basic, FA, LB, TC, FTC, TCM1, and TCM2 attachments, deliberately omitting FB, CA, CB, and CR brackets.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-75S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-75S |
|---|---|
| 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 SAIJ40BX550-75S
| 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 SAIJ40BX550-75S Is Used
Machine Changeover
Dial in the 475-550mm travel window during product size changeovers to set new end positions quickly without swapping the cylinder.
End-Position Tuning
Fine-tune the retract stroke at commissioning using the rear stopper, avoiding the need to bolt on external physical stops.
Long-Stroke Assembly
Handle extended reach clamping or lifting tasks, relying on the 879N force at 0.7 MPa while guiding the load externally.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-75S the Right Cylinder?
Choose this 40mm bore if a 32mm bore (offering 563N push at 0.7 MPa) is too weak, but a 50mm bore (1374N at 0.7 MPa) is oversized. The 75mm adjustment range is ideal for product changeovers on a packaging line, allowing you to dial in the exact end position during commissioning rather than machining custom spacers or swapping a fixed-stroke SAI cylinder.
Because the 550mm stroke is long, the 16mm rod will still need external guide rails to prevent side-loading damage. Remember that the rear adjuster acts only as a travel stop; it cannot hold a load without live air pressure. For true pneumatic locking without air, select an SAIL or BSAI cylinder. To replace an ISO 15552 cylinder, match the 40mm bore, 550mm stroke, 75mm adjustment, G1/4 PT port, desired mounting, and the -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 SAIJ40BX550-75S FAQ
The rear adjuster screw lets you shorten the 550mm nominal stroke by up to 75mm, creating a usable travel window of 475-550mm. The adjuster acts as a mechanical stop and works with the built-in air cushions to decelerate the load, but it does not lock the position without live air pressure.
At 0.5 MPa, it provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N. The maximum thrust is 128 kgf at 1.0 MPa.
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 SAIJ40BX550-75S
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.