This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAI40X200S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAI40X200S 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-SI40X200S
The AirTAC Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI40X200S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 200mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAI40X200S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke200 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAI40X200S
About the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI40X200S
The AirTAC B04-SI40X200S is a discontinued double-acting ISO 15552 profile cylinder delivering 628 N push force at 0.5 MPa. The B04- prefix marks this as a construction-machinery dedicated variant, mechanically identical to the base SI40X200S. AirTAC replaced this EOL unit with the SAI40X200S drop-in, featuring the same G1/4 port, 16 mm rod and ISO 15552 mounting interface.
The SAI upgrade introduces a two Y-shaped one-way piston seal for low start-up pressure and long life. It also adds SAIL, SAIF and BSAI lock variants the SI line lacked. With a safe working load around 377 N (60% of the 0.5 MPa push) and a vertical lift capacity of 32 kg at a 2:1 margin, it fits heavy-equipment needs. The original -S magnet supports CS1-B/DS1-B switches.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI40X200S Technical Specifications
| Model | Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI40X200S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAI40X200S |
| Bore size | Ø40 mm |
| Stroke | 200 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAI40X200S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / 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 | |
The B04-SAI40X200S 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-SI40X200S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×200 | 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-SI40X200S Is Used
Excavator Door Latches
Actuates heavy cab doors on earthmoving equipment, utilizing the 628 N push force to securely lock and release mechanisms in dusty environments.
Loader Linkage Stops
Provides a reliable 200 mm stroke for positioning mechanical stops on front-end loader arms, benefiting from the rugged ISO 15552 profile barrel.
Crane Outrigger Pins
Deploys and retracts locking pins on mobile crane outriggers, where the 32 kg vertical lift capacity ensures positive engagement against gravity.
Replacing the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI40X200S with the B04-SAI40X200S
To replace the B04-SI40X200S, order the SAI40X200S. It drops into existing fixtures via the exact ISO 15552 mounting interface, matching the 40 mm bore, 200 mm stroke, G1/4 port and M12x1.25 rod thread. Keep the -S magnet for CS1-B/DS1-B sensors (the SAI uses current AirTAC switches). For higher force, the 50 mm bore yields 982 N push at 0.5 MPa; for tighter spaces, the 32 mm bore gives 402 N. Note that plain cylinders drift on air loss—the cushion only decelerates. For load holding, use an external rod lock, pilot check valve, or the SAIL/BSAI lock variants. At 200 mm stroke, side-load is minimal, but always guide the rod to prevent bending.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAI40X200S
- ✓ 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-SI40X200S FAQ
Yes, the B04-SI40X200S (the construction-machinery dedicated variant of SI40X200S) is discontinued. The exact drop-in replacement is the SAI40X200S. It is dimensionally interchangeable per ISO 15552, retaining the same 40 mm bore, 200 mm stroke, 628 N force, G1/4 port and mounting interface.
The 40 mm bore features a G1/4 air port and a 16 mm rod. It delivers 628 N push and 528 N pull at 0.5 MPa, 879 N push at 0.7 MPa, 1130 N push at 0.9 MPa, and a theoretical max of 128 kgf at 1.0 MPa. Operating speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
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