Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 115mm 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
- Stroke115 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20
The AirTAC SAIJ40X115-20 is a double-acting ISO 15552 profile cylinder equipped with a rear stroke adjuster, letting you dial the effective travel down to a 95-115 mm window during commissioning. Delivering 628 N of push force at 0.5 MPa, it handles moderate positioning tasks without requiring external stops. The extruded aluminum barrel features sensor grooves on both sides for flexible switch placement.
This SKU utilizes a SUS304 stainless steel rod (option B) for superior corrosion resistance and features a PT tapered port thread. The rear adjustment screw acts purely as a mechanical stop to fine-tune the retract end position; it does not lock the load without live air pressure. For load-holding requirements, consider the SAIL or BSAI series instead.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 115 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 SAIJ40BX115-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×115 | 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 SAIJ40BX115-20 Is Used
Machine Changeover
Quickly fine-tune the 95-115 mm travel window during product size changes without swapping cylinders or adding external mechanical stops.
End-Position Calibration
Dial in the exact retract distance on automated assembly stations, using the rear screw to compensate for mechanical wear over time.
Variable Diverter Stops
Adjust the stroke on the fly for conveyor routing arms that handle different package sizes on a single line.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20 the Right Cylinder?
Choose this 40 mm bore when a 32 mm cylinder (providing 402 N push at 0.5 MPa) lacks thrust, but a 63 mm bore (1559 N) is physically oversized. The 20 mm adjustment window is ideal for product changeovers where exact end-of-stroke positioning varies slightly, eliminating the need to physically swap out a fixed-stroke SAI cylinder. To match this ISO 15552 footprint exactly, specify the 40 mm bore, 115 mm stroke, PT port thread, SUS304 rod, and no magnet.
Because the stroke is 115 mm, side-load risks are minimal, but always ensure the M12x1.25 rod thread is aligned with your load to prevent binding. Remember that the air cushion and rear stopper decelerate the piston but cannot hold a load statically without continuous air pressure.
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 SAIJ40BX115-20 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 nominal 115 mm stroke by up to 20 mm, creating a usable travel window of 95-115 mm. It functions as a mechanical stop for end-position tuning and does not lock the load without live air.
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