Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-20 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 SAIJ40BX165-20
The AirTAC SAIJ40X165-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, allowing you to dial back the nominal 165 mm travel by up to 20 mm. This creates a precise 145-165 mm usable window, allowing you to fine-tune the retract end position at commissioning without swapping out the cylinder or adding external stops. It delivers 628 N of push force at 0.5 MPa and 1130 N at 0.9 MPa.
Built with a SUS304 stainless steel rod (option B) and PT tapered ports, this extruded aluminum profile cylinder is designed for demanding environments. It features adjustable air cushions at both ends to decelerate the load smoothly. Note that the rear adjuster acts strictly as a travel stop, not a lock; the cylinder requires live air to hold its position.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-20 |
|---|---|
| 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 SAIJ40BX165-20
| 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 SAIJ40BX165-20 Is Used
Machine Changeover
Quickly adjust the 145-165 mm travel window during product size changeovers on a packaging line without replacing the cylinder.
End-Position Tuning
Fine-tune the exact retract position during commissioning to perfect a pressing or locating operation without external stopper hardware.
Variable Diverter Stops
Adjust the stroke length on the fly for a conveyor diverter gate to handle different package widths accurately.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX165-20 the Right Cylinder?
Choose this 40 mm bore when you need more force than a 32 mm cylinder (which provides 402 N push at 0.5 MPa) but want a more compact footprint than a 50 mm option (982 N). The adjustable stroke is ideal for machine setups requiring variable end-stops during product changeovers. For exact ISO 15552 replacement matching, verify the 165 mm stroke, 20 mm adjustment range, PT G1/4 port, and your required mounting style from the available SAIJ set: Basic, FA, LB, TC, FTC, TCM1, or TCM2.
Because this cylinder lacks a magnet (-S not specified), it will not work with CMSE or DMSE sensors out of the box. If you need to hold a load securely without continuous air pressure, this cylinder is not suitable; instead, look to the SAIL or BSAI series for mechanical locking capabilities.
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 SAIJ40BX165-20 FAQ
At 0.5 MPa, it provides 628 N of push force and 528 N of pull force. At the maximum operating pressure of 0.9 MPa, the push force increases to 1130 N.
The rear adjuster screw lets you shorten the effective stroke by up to 20 mm from the nominal 165 mm, providing a usable travel window of 145-165 mm. It acts as a mechanical stop to set the end position and does not lock the load without air pressure.
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