This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAI32X650S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAI32X650S in place of this model. 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 B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI32X650S
The AirTAC Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI32X650S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø32mm bore and 650mm stroke, G1/8 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAI32X650S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ32 mm
- Stroke650 mm
- Port sizeG1/8
- Acting typeDouble acting
- Rod threadM10×1.25
- StatusDiscontinued → B04-SAI32X650S
About the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI32X650S
The AirTAC B04-SI32X650S is a discontinued double-acting ISO 15552 profile cylinder. The B04- prefix marks it as the construction-machinery dedicated variant of the base SI32X650S, mechanically identical with a 32mm bore, 650mm stroke, G1/8 port and 402N push force at 0.5MPa. AirTAC replaced this EOL unit with the SAI32X650S, a true drop-in sharing the same interface, bore, stroke, force and mounting.
The SAI upgrade features a two Y-shaped one-way piston seal for low start-up pressure and long life. For load holding the SI lacked, explore SAIL or BSAI lock variants. Theoretical max is 82kgf at 1.0MPa. Computed buyer insight: safe working load is roughly 241N (60% of 402N), yielding a 20kg vertical lift with a 2:1 margin.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI32X650S Technical Specifications
| Model | Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI32X650S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAI32X650S |
| Bore size | Ø32 mm |
| Stroke | 650 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 B04-SAI32X650S 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 B04-SAI32X650S 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 B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI32X650S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 32 | Bore size in mm. |
| ×650 | 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 B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI32X650S Is Used
Excavator Panel Routing
Actuates routing guides for hydraulic panel tubing on heavy-equipment assembly lines, utilizing the 650mm stroke to clear structural obstructions during fabrication.
Loader Arm Fixture
Positions welding fixtures for loader arm components, where the 402N push force at 0.5MPa securely clamps brackets without deforming the steel.
Chassis Transfer Gate
Drives heavy-duty transfer gates on construction-vehicle chassis conveyors, benefiting from the adjustable end cushions to decelerate the 650mm travel smoothly.
Replacing the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI32X650S with the B04-SAI32X650S
To replace the B04-SI32X650S, order the SAI32X650S. It drops into existing fixtures per ISO 15552 mounting dimensions. Confirm your G1/8 port, M10x1.25 rod thread, and CS1-B/DS1-B legacy sensors (the -S magnet enables these; SAI uses current AirTAC switches). At 0.5MPa it yields 402N push and 345N pull; if undersized, the neighboring 40mm bore provides 628N push. For the 650mm stroke, use external guides to prevent rod bending and side-load wear. The cushion only decelerates; for load holding on air loss, use an external pilot check valve or the SAIL/BSAI lock variant.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAI32X650S
- ✓ Same bore / stroke / force
- ✓ Port/thread type (PT/G/NPT)
- ✓ Magnet (-S) for sensors?
- ✓ Mounting reused (FA/FB/CA/CB/CR/LB/TC)
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI32X650S FAQ
Yes, the B04-SI32X650S (the construction-machinery dedicated variant of SI32X650S) is discontinued. The exact drop-in replacement is the SAI32X650S. It shares the identical ISO 15552 mounting interface, 32mm bore, 650mm stroke, G1/8 port, and output force, fitting existing fixtures perfectly.
The 32mm bore has a G1/8 air port. Force ratings are: 402N push and 345N pull at 0.5MPa, 563N push at 0.7MPa, 724N push at 0.9MPa, and a theoretical max of 82kgf at 1.0MPa. Operating speed is 30-800mm/s.
Related AirTAC SAI Cylinders
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