Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-50
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-50 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 165mm 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
- Stroke165 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-50
The AirTAC SAIJ40X165-50 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that creates a 115-165mm usable travel window. It delivers 628N of pull force at 0.5 MPa and operates at speeds of 30-800mm/s. The extruded aluminum barrel includes sensor grooves on both sides for flexible mounting.
This variant uses a SUS304 stainless steel rod for corrosion resistance and PT tapered port threads. The rear stopper screw allows fine end-position tuning during commissioning without swapping the cylinder or adding external stops. The adjuster acts as a travel stop and deceleration point, not a lock, so it cannot hold loads without live air pressure.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-50 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-50 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 165 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 SAIJ40BX165-50
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×165 | 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 SAIJ40BX165-50 Is Used
Variable End Stops
Dial in the retract position within the 115-165mm window for product-size changeovers without machining new hard stops.
Machine Setup
Fine-tune the end-of-stroke position during commissioning to align tooling perfectly using the rear adjustment screw.
Product Sorting
Adjust the reject stroke on the fly to handle varying package lengths on a single pneumatic diverter line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-50 the Right Cylinder?
Choose this 40mm bore when you need precise retract positioning that a fixed SAI cannot provide. If your application requires less force, step down to a 32mm bore offering 345N pull at 0.5MPa. For heavier loads, step up to a 50mm bore providing 825N pull. Since the stroke is 165mm, side loads are moderate, but always guide long unsupported rods to prevent barrel wear.
For ISO 15552 replacement matching, verify the 40mm bore, 165mm stroke, 50mm adjustment range, PT port thread, and standard mounting set (Basic, FA, LB, TC, FTC, TCM1, TCM2). Note that SAIJ omits FB, CA, CB, and CR mounts. If you need true load holding without live air, consider the SAIL air-released lock or BSAI clamp-lock instead of relying on the adjuster.
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 SAIJ40BX165-50 FAQ
The rear adjuster screw lets you shorten the nominal 165mm stroke by up to 50mm, creating a usable travel window of 115-165mm. It acts as a mechanical stop to set the exact retract position without adding external stops.
At 0.5MPa operating pressure, this 40mm bore cylinder provides 628N of pull force and 879N of push force. The maximum operating pressure is 1.0MPa.
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