Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20S
The AirTAC Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20S 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 SAIJ40BX115-20S
The AirTAC SAIJ40X115-20-S is a double-acting ISO 15552 profile cylinder featuring a rear stroke adjuster that allows you to fine-tune the travel window from 95 to 115 mm without external stops. It delivers 628 N of push force and 528 N of pull force at 0.5 MPa, making it well-suited for mid-range actuation tasks. The barrel is extruded aluminum with sensor grooves on both sides.
This specific configuration includes a SUS304 stainless steel rod for enhanced corrosion resistance and a pre-installed magnet (-S) compatible with CMSE reed and DMSE electronic sensors. It uses PT tapered ports sized at G1/4 and supports speeds from 30 to 800 mm/s. The rear adjuster acts purely as a travel stop to dial in end positions during commissioning, meaning it will not hold a load if air pressure drops.
Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20S Technical Specifications
| Model | Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20S |
|---|---|
| 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 SAIJ40BX115-20S
| 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 SAIJ40BX115-20S Is Used
Machine Changeover
Dial in the 95-115 mm travel window during product size transitions without replacing the cylinder or adding external mechanical stops.
Assembly Positioning
Uses the 628 N push force to press or place components, relying on the rear screw to fine-tune the exact end-of-stroke contact point.
Sensor-Driven Testing
Leverages the integrated -S magnet with DMSE electronic sensors to confirm stroke endpoints while the adjuster sets the physical travel limit.
Is the Airtac SAIJ40 Adjustable Cylinder SAIJ40BX115-20S the Right Cylinder?
Choose this 40 mm bore when a 32 mm bore (402 N push at 0.5 MPa) is too weak, but a 63 mm bore (1559 N push) is oversized for your frame. The 20 mm adjustment range is ideal for machinery requiring precise end-position tuning during product changeovers, eliminating the need to physically swap out a fixed-stroke SAI cylinder. If your application requires true load-holding without live air pressure, this cylinder is not a lock; you should consider the SAIL or BSAI series instead.
Because the 115 mm stroke falls under the 300 mm threshold, side-load stress is minimal, though the 16 mm rod and M12x1.25 thread still handle moderate lateral loads effectively. For ISO 15552 dimensional interchangeability, match the 40 mm bore, 115 mm stroke, 20 mm adjustment, PT G1/4 ports, and the -S magnet. Note that SAIJ supports a specific mounting subset: Basic, FA, LB, TC, FTC, TCM1, and TCM2, omitting the FB, CA, CB, and CR mounts.
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 SAIJ40BX115-20S FAQ
The rear adjuster acts as a mechanical stop that lets you shorten the nominal 115 mm stroke by up to 20 mm, creating a usable travel window of 95 to 115 mm. It functions as a travel stop and does not lock or hold the load without live air pressure.
At 0.5 MPa operating pressure, it provides 628 N of push force and 528 N of pull force. At the maximum pressure of 1.0 MPa, the push force reaches 1130 N.
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