Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20 is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 20mm 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
- Stroke20 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20
The AirTAC SAIJ40X20-20 is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel end by up to 20 mm. Because the nominal stroke is only 20 mm, this configuration yields a highly versatile 0-20 mm usable travel window, letting you set the exact retraction point during commissioning without swapping hardware. It delivers 628 N of push force at 0.5 MPa and uses a PT tapered port thread.
This model features a SUS304 stainless steel rod for superior corrosion resistance and operates at speeds between 30 and 800 mm/s. The extruded aluminum barrel includes sensor grooves on both sides, allowing you to mount CMSE reed or DMSE electronic sensors if position feedback is required later. It supports a reduced mounting set of Basic, FA, LB, TC, FTC, TCM1, and TCM2.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20 Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20 |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 20 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 SAIJ40BX20-20
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×20 | 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 SAIJ40BX20-20 Is Used
Precision End-Stop Tuning
Dial in the exact retraction point within a 0-20 mm window during machine commissioning to achieve perfect positioning without machining new hard stops.
Product Changeover
Quickly adjust the cylinder's effective stroke on the line when switching between product sizes, minimizing downtime and avoiding cylinder swaps.
Corrosive Assembly Tasks
Leverage the SUS304 stainless steel rod for light clamping and positioning tasks in environments where moisture or mild chemicals are present.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX20-20 the Right Cylinder?
Choose this 40 mm bore when you need more thrust than a 32 mm cylinder (which provides 402 N push at 0.5 MPa) but want to keep the physical footprint compact. The adjustable stroke is perfect for applications requiring variable end-stops or frequent product changeovers, eliminating the need to bolt on external stops. For fixed travel needs without commissioning tweaks, the standard SAI cylinder is a simpler alternative.
When integrating this cylinder, remember the rear adjuster acts strictly as a travel stop, not a lock; it cannot hold a load without live air pressure. If your application requires true load-holding, consider the SAIL or BSAI series. This SAIJ40X20-20 is dimensionally interchangeable per ISO 15552 and uses a G1/4 port. Because the stroke is under 300 mm, side-load stress on the 16 mm rod is minimal, though external guides are still recommended for heavy lateral loads.
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 SAIJ40BX20-20 FAQ
At a standard operating pressure of 0.5 MPa, this 40 mm bore cylinder provides 628 N of push force and 528 N of pull force. It can reach a maximum push force of 1130 N at 0.9 MPa.
The rear adjuster screw allows you to trim the effective travel back by up to 20 mm. Since the nominal stroke is 20 mm, you can set the usable travel anywhere within a 0-20 mm window to fine-tune the end position without adding external stops.
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