This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the drop-in replacement SAI32BX425S, with the same bore, stroke, output force, port and mounting, so it fits the same application. The SAI replacement keeps the same ISO 15552 mounting interface, bore, stroke, output force and accessories, so it drops straight into existing fixtures. It is the current-production version of this cylinder with an upgraded piston seal.
Airtac SI32 Standard Air Cylinder SI32BX425S
The AirTAC Airtac SI32 Standard Air Cylinder SI32BX425S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø32mm bore and 425mm stroke, G1/8 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the SAI32BX425S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ32 mm
- Stroke425 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- StatusDiscontinued → SAI32BX425S
- No minimum order. A single piece can be ordered.
- Ready in 3–5 business days. That is the time we take to process the order and hand it to the carrier. Transit time after that depends on the destination.
About the Airtac SI32 Standard Air Cylinder SI32BX425S
The AirTAC SI32BX425S is a discontinued double-acting ISO 15552 profile cylinder featuring a 32mm bore, 425mm stroke, SUS304 stainless steel rod (-B) and a piston magnet (-S). It delivers 402 N push force at 0.5 MPa via a G1/8 port. AirTAC replaced this legacy unit with the SAI32BX425S, a true drop-in upgrade sharing the exact ISO 15552 mounting interface, bore, stroke, force and port size.
The SAI successor introduces an upgraded piston seal with two Y-shaped one-way elements for lower start-up pressure and longer life. For your sizing, a safe working load is roughly 241 N (60% of the 0.5 MPa push force), equating to a 20 kg vertical lift with a 2:1 margin. Note that standard cylinders drift without live air; the cushion only decelerates. For load holding, explore the SAIL or BSAI lock variants.
Airtac SI32 Standard Air Cylinder SI32BX425S Technical Specifications
| Model | Airtac SI32 Standard Air Cylinder SI32BX425S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | SAI32BX425S |
| Bore size | Ø32 mm |
| Stroke | 425 mm |
| Acting type | Double acting |
| Port size | G1/8 |
| Rod thread | M10×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1000 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The SAI32BX425S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø32mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 402 N | 346 N |
| 0.7 MPa | 563 N | — |
| Max (@1.0 MPa) | 82 kgf | |
The SAI32BX425S produces the same force from the same bore — a true drop-in on output. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac SI32 Standard Air Cylinder SI32BX425S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 32 | Bore size in mm. |
| ×425 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Legacy SI-family variants: SID (double rod), SIJ (adjustable stroke) — each maps to its SAI equivalent (SID→SAID, SIJ→SAIJ). Rod material: carbon steel (blank) / SUS420J2 (A) / SUS304 (B).
Where the Airtac SI32 Standard Air Cylinder SI32BX425S Is Used
Stainless Rod Actuation
Ideal for light-duty machinery requiring the SUS304 corrosion-resistant rod for washdown or humid environments, pushing loads safely up to 241 N.
Package Diverting
Provides a 425mm reach to push small to medium parcels across conveyor lanes, utilizing the 20 kg vertical lift capacity for vertical gating.
Light Material Handling
Deploys sensor-ready positioning via the -S magnet for end-of-stroke confirmation in compact sorting and lifting fixtures within logistics centers.
Replacing the Airtac SI32 Standard Air Cylinder SI32BX425S with the SAI32BX425S
To replace the SI32BX425S, order the SAI32BX425S. Confirm the ISO 15552 mounting interface, the 32mm bore, 425mm stroke, G1/8 port (PT/G/NPT thread options) and your mounting accessory. The -B rod is SUS304 stainless steel and the -S denotes a piston magnet for CS1-B/DS1-B switches (the SAI uses current AirTAC switches). Sizing both ways: if you need more force, the neighbouring 40mm bore offers 628 N push at 0.5 MPa; if 402 N is excessive, check smaller options. Because 425mm exceeds 300mm, add external guides to prevent rod bending under side loads. A plain cylinder does not hold load on air loss—use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants for secure holding. The SAIF variant integrates a 4M valve if self-actuation is needed.
Replacement checklist
- ✓ Same ISO 15552 interface → SAI32BX425S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac SI32 Standard Air Cylinder SI32BX425S FAQ
Yes, the SI32BX425S is discontinued. The exact drop-in replacement is the SAI32BX425S. It is dimensionally interchangeable per ISO 15552, matching the 32mm bore, 425mm stroke, 402 N force, G1/8 port, SUS304 rod and mounting interface.
At 0.5 MPa it provides 402 N push and 345 N pull force. At 0.7 MPa push is 563 N, and at 0.9 MPa it is 724 N. The theoretical max force is 82 kgf at 1.0 MPa. It operates at 0.15-1.0 MPa, has a G1/8 port, M10x1.25 rod thread, 27mm cushions, and speeds of 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the SAI32BX425S
Send us the quantity and destination. We confirm price, stock and lead time on the SAI32BX425S replacement — usually within 7-8 hours.