Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20S is a genuine double-acting ISO 15552 profile-barrel air cylinder with a Ø40mm bore and 140mm 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
- Stroke140 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- CushionAdjustable, 30 mm
About the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20S
The AirTAC SAIJ40X140-20-S is a double-acting, single-rod ISO 15552 profile cylinder featuring a rear stroke adjuster. It provides a 628N push force at 0.5 MPa and utilizes a PT tapered port thread. The integrated -S magnet enables position sensing with AirTAC CMSE reed and DMSE electronic sensors.
This specific SKU delivers a usable travel window of 120-140 mm, allowing you to dial back the 140 mm nominal stroke by up to 20 mm. The external rear stopper screw lets you fine-tune the retract end position at commissioning without swapping the cylinder or adding external stops. The extruded aluminum barrel includes sensor grooves on both sides, and the SUS304 stainless steel rod is ideal for corrosive environments.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20S |
|---|---|
| Series | SAI ISO 15552 profile cylinder |
| Bore size | Ø40 mm |
| Stroke | 140 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 SAIJ40BX140-20S
| SAI | ISO 15552 profile-barrel cylinder series. |
|---|---|
| 40 | Bore size in mm. |
| ×140 | 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 SAIJ40BX140-20S Is Used
Machine Changeover
Quickly dial in the 120-140mm travel window during product size changes without disassembling the actuator.
End-Position Tuning
Fine-tune the retract stop during commissioning to dial out mechanical tolerance and achieve precise positioning.
Variable End Stops
Adjust the rear stroke screw to alter the pusher distance on a sorting line without adding external physical stops.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX140-20S the Right Cylinder?
Choose this 40mm bore if your application requires 628N of push force at 0.5 MPa (or 879N at 0.7 MPa). If you need less force, the 32mm bore offers 402N at 0.5 MPa; if you need more, the 50mm bore provides 982N at 0.5 MPa. The adjustable stroke is preferred over a fixed SAI cylinder when you need variable end-stops for product changeovers.
For ISO 15552 replacement matching, specify a 40mm bore, 140mm stroke, 20mm adjustment, PT port thread, and a -S magnet. Note that the rear adjuster acts as a travel stop and does not hold the load without live air; for true load-holding, consider the SAIL or BSAI series. The 16mm rod and M12x1.25 thread handle moderate side loads, but long unsupported strokes still require an external guide. SAIJ uses a reduced mounting set: Basic, FA, LB, TC, FTC, TCM1, and TCM2.
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 SAIJ40BX140-20S FAQ
At 0.5 MPa, this 40mm bore cylinder provides 628N of push force and 528N of pull force. At 0.7 MPa, the push force increases to 879N. The operational speed range is 30-800 mm/s.
The rear adjuster screw allows you to shorten the effective stroke by up to 20mm, creating a usable travel window of 120-140mm. The adjuster acts as a mechanical stop to set the end position and does not lock or hold the load without continuous air pressure.
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