Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-20S 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 SAIJ40BX550-20S
The AirTAC SAIJ40X550-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 530 to 550 mm during commissioning. Delivering 628 N of push force at 0.5 MPa, it uses a PT tapered G1/4 port and a 16 mm rod. The -S magnet option enables position sensing with AirTAC CMSE reed or DMSE solid-state switches.
This model features a SUS304 stainless steel rod for superior corrosion resistance in harsh environments. It provides variable air cushioning at both ends to decelerate the load, but the rear adjuster acts only as a travel stop and does not hold the load without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-20S |
|---|---|
| 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 SAIJ40BX550-20S
| 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 SAIJ40BX550-20S Is Used
Variable End-Stop Tuning
Dial in the exact 530-550 mm travel limit during machine setup to accommodate different material lengths without changing hardware.
Product Changeover
Quickly adjust the retract position on packaging lines when switching between box sizes, ensuring precise stops without external bumpers.
Corrosion-Resistant Actuation
The SUS304 stainless steel rod handles washdown or humid industrial environments while providing reliable 628 N thrust.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX550-20S 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) for heavier handling, or down from a 50 mm bore (982 N) to save space. The 20 mm stroke adjustment is ideal for product-size changeovers on a line, allowing variable end-stops without swapping the cylinder or bolting on external stops. For load-holding without live pressure, select a SAIL or BSAI cylinder instead, as the SAIJ adjuster is a stop, not a lock.
With a 550 mm stroke, the unsupported piston rod is highly susceptible to side-loading and deflection; an external guide rail is strongly recommended to prevent premature seal wear. This profile cylinder is dimensionally interchangeable per ISO 15552 and uses a mounting subset of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX550-20S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. The operational speed range is 30-800 mm/s.
The rear adjuster screw acts as a mechanical stop that lets you shorten the effective stroke by up to 20 mm, creating a usable travel window of 530 to 550 mm. It only sets the end position and does not lock or hold the load without continuous air pressure.
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