Airtac SAIJ40 Adjustable Cylinder SAIJ40BX200-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX200-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 200mm 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
- Stroke200 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX200-20S
The AirTAC SAIJ40X200-20-S is a double-acting, single-rod ISO 15552 profile cylinder equipped with a rear stroke adjuster. It provides a 200 mm nominal stroke that can be fine-tuned down by up to 20 mm, giving you a precise 180-200 mm usable travel window during commissioning. Delivering 628 N of push force at 0.5 MPa, it fits perfectly into medium-duty applications.
This variant features a SUS304 stainless steel rod for superior corrosion resistance and includes a magnet (-S) for use with AirTAC CMSE reed and DMSE electronic sensors. The extruded aluminum barrel includes sensor grooves on both sides, and fluid is supplied via a PT G1/4 port.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX200-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX200-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 200 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 SAIJ40BX200-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×200 | 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 SAIJ40BX200-20S Is Used
Machine Changeover
Dial in the 180-200 mm travel window on the fly to accommodate different product sizes without physically replacing the cylinder.
End-Position Tuning
Fine-tune the retract end position during initial commissioning to perfect seating without adding bulky external stops.
Sorting Diverters
Provides 628 N of push force at 0.5 MPa to actuate conveyor routing gates, with the SUS304 rod resisting humid plant environments.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX200-20S the Right Cylinder?
Choose this 40 mm bore when you need more power than a 32 mm cylinder (402 N push at 0.5 MPa) but want to step up from the smaller G1/8 porting. The adjustable stroke is ideal for machine setups requiring variable end stops or product changeovers without swapping the cylinder for a fixed-stroke SAI model. When replacing an ISO 15552 cylinder, match the 40 mm bore, 200 mm stroke, -20 adjustment, PT G1/4 port, and -S magnet.
Because the 200 mm stroke is under the 300 mm threshold, side-load stress is moderate, but always ensure the M12x1.25 rod thread is properly aligned. Remember that the rear adjuster acts only as a travel stop and does not hold the load without live air; for dead-end holding, use an external rod lock or a SAIL/BSAI cylinder.
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 SAIJ40BX200-20S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. At 0.7 MPa, the push force increases to 879 N.
The rear adjuster screw allows you to shorten the effective stroke by up to 20 mm, creating a 180-200 mm travel window. It acts as a mechanical stop and does not lock the load without continuous air pressure.
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