Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50 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 SAIJ40BX550-50
The AirTAC SAIJ40X550-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the retract end position. It provides a usable travel window of 500 to 550 mm, letting you dial back the nominal stroke by up to 50 mm during commissioning without adding external stops. In the 40 mm bore class, it generates 628 N of push force and 528 N of pull force at 0.5 MPa.
This unit is built with a SUS304 stainless steel rod for superior corrosion resistance and uses a PT tapered G1/4 port. The extruded aluminum barrel includes sensor grooves on both sides, ready for CMSE reed or DMSE solid-state switches if you add a magnet later. It features adjustable air cushions at both ends with a 30 mm cushion stroke to absorb kinetic energy.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50 |
|---|---|
| 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 SAIJ40BX550-50
| 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 SAIJ40BX550-50 Is Used
Product Changeover
Dial in the exact retract distance within the 500-550 mm window when switching packaging sizes on a line, eliminating the need to physically swap cylinders.
Machine Setup
Fine-tune the end-of-stroke position during commissioning to perfectly time the engagement of tooling without machining custom external stoppers.
Variable End Stops
Adjust the travel limit on the fly for automated processes that require slight positional shifts to accommodate varying material thicknesses.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-50 the Right Cylinder?
Choose this adjustable-stroke model when your machine setup requires variable end stops or frequent product-size changeovers, rather than relying on a fixed-stroke SAI cylinder. If you need higher thrust, stepping up to the 50 mm bore yields 982 N of push force at 0.5 MPa; dropping down to the 32 mm bore provides 402 N. Because the 550 mm stroke is long, the 16 mm rod needs external guidance to prevent excessive side loading.
To match this SKU for an ISO 15552 interchange, specify a 40 mm bore, 550 mm stroke, 50 mm adjustment range, PT G1/4 port, and SUS304 (B) rod material. Remember that the rear adjuster acts only as a travel stop, not a lock; a plain SAIJ will not hold a load without live air pressure, so use a SAIL or BSAI cylinder for true load-holding.
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 SAIJ40BX550-50 FAQ
The rear adjuster screw lets you shorten the effective stroke by up to 50 mm, creating a usable travel window of 500 to 550 mm. It acts as a mechanical stop to set the end position and does not lock the load without live air pressure.
At an operating pressure of 0.5 MPa, the SAIJ40X550-50 provides 628 N of push force and 528 N of pull force. It can reach up to 879 N of push force at 0.7 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 SAIJ40BX550-50
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.