Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 240mm 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
- Stroke240 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20S
The AirTAC SAIJ40X240-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a usable travel window of 220 to 240 mm, letting you dial in the exact retract end-position during commissioning without swapping out the barrel. In this bore size, it delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it a solid fit for mid-range automation tasks.
This specific SKU is built with a SUS304 stainless steel rod (code B) for superior corrosion resistance, and uses PT tapered ports. Because it includes a magnet (-S), it works seamlessly with AirTAC CMSE reed and DMSE electronic sensors mounted in the dual-side sensor grooves. The rear adjuster acts purely as a mechanical stop to fine-tune travel, so you still need live air pressure to hold the load.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 240 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 SAIJ40BX240-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×240 | 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 SAIJ40BX240-20S Is Used
Machine Changeover
Dial in the 220-240 mm retract position precisely when switching product sizes on a packaging line, avoiding external stopper swaps.
Clamping Fixtures
Provides 628 N of push force at 0.5 MPa for holding parts, with fine end-position tuning to accommodate varying material thicknesses.
Diverting Arms
Uses the SUS304 stainless rod for corrosion resistance in washdown environments while accurately positioning diverters at the end of travel.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX240-20S the Right Cylinder?
Choose this 40 mm bore cylinder when your application needs 628 N of push force at 0.5 MPa. If your project requires less force, stepping down to a 32 mm bore yields 402 N; if you need more clamping power, a 50 mm bore provides 982 N. The adjustable 220-240 mm travel window is ideal for product changeovers where exact end-stops vary, saving you from adding external stopper blocks. For load-holding without continuous air pressure, this cylinder cannot lock in place, so you would need to look at the SAIL or BSAI series instead.
As a direct ISO 15552 interchangeable unit, it matches standard mounting footprint dimensions and offers a reduced mounting set including Basic, FA, LB, TC, FTC, TCM1, and TCM2. At 240 mm stroke, the 16 mm rod and M12x1.25 thread handle reasonable loads, but for long unsupported strokes you should add an external guide rail to prevent excessive side-loading on the rod.
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 SAIJ40BX240-20S FAQ
At 0.5 MPa operating pressure, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach up to 1130 N of push force at 0.9 MPa.
The rear adjuster screw lets you mechanically shorten the nominal 240 mm stroke by up to 20 mm, creating a 220-240 mm usable travel window. This stopper only sets the end position; it does not lock the load without live air pressure.
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