This model is discontinued
AirTAC has phased out the MAL series. The drop-in replacement is B04-SAI80X355S — same bore, stroke, output force, port and mounting, so it fits the same application. Simply order the B04-SAI80X355S 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-SI80X355S
The AirTAC Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X355S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø80mm bore and 355mm stroke, G3/8 air ports and adjustable end cushioning. This model is discontinued — the drop-in replacement is the B04-SAI80X355S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ80 mm
- Stroke355 mm
- Port sizeG3/8
- Acting typeDouble acting
- Rod threadM20×1.5
- StatusDiscontinued → B04-SAI80X355S
About the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X355S
The AirTAC B04-SI80X355S is a discontinued double-acting ISO 15552 profile cylinder. The B04- prefix marks it as a construction-machinery dedicated variant of the SI80X355S, mechanically identical to the base model with 2513 N push force at 0.5 MPa, a 25 mm rod, and a G3/8 port. AirTAC replaced this legacy unit with the SAI80X355S, a true drop-in sharing the exact ISO 15552 mounting interface, 355 mm stroke, and output force.
The SAI upgrade features a modernized piston seal with two Y-shaped one-way elements for low start-up pressure and extended life. For this bore class, the safe working load is roughly 1508 N (about 60% of the 0.5 MPa push force), translating to a vertical lift capacity of approximately 128 kg with a 2:1 safety margin. The original SI utilized CS1-B/DS1-B switches via its -S magnet, while the SAI family introduces lock and clamp variants (SAIL, BSAI) absent in the legacy line.
Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X355S Technical Specifications
| Model | Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X355S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAI80X355S |
| Bore size | Ø80 mm |
| Stroke | 355 mm |
| Acting type | Double acting |
| Port size | G3/8 |
| Rod thread | M20×1.5 |
| 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, 36 mm |
| Max standard stroke | Up to 1500 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAI80X355S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø80mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 2513 N | 2268 N |
| 0.7 MPa | 3519 N | — |
| Max (@1.0 MPa) | 513 kgf | |
The B04-SAI80X355S 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-SI80X355S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 80 | Bore size in mm. |
| ×355 | 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-SI80X355S Is Used
Excavator Actuation
Drives secondary positioning links on heavy construction equipment where the B04- prefix indicates dedicated machinery integration and robust 2513 N output.
Loader Arm Mechanism
Provides reliable 355 mm travel for automated gate or cover operations on earthmoving machinery, requiring external guides to manage side loads.
Heavy Fixture Clamping
Secures large structural components during assembly with a safe working load near 1508 N, utilizing the integrated magnet for end-of-stroke confirmation.
Replacing the Airtac B04-SI Construction Machinery Special ISO Standard Cylinder B04-SI80X355S with the B04-SAI80X355S
To replace the B04-SI80X355S, order the SAI80X355S. It drops directly into existing fixtures via the ISO 15552 mounting interface, preserving the 80 mm bore, 355 mm stroke, 2513 N force, and G3/8 port. Verify your mounting accessory (LB, FA, TC) and thread type (PT, G, NPT). Because this is a 355 mm stroke, add external guides to prevent rod bending and side-load wear. If sizing alternatives, a 63 mm bore yields 1559 N push at 0.5 MPa, while a 100 mm bore yields 3927 N. Note that a standard cylinder drifts on air loss; for load holding, specify the SAIL lock or BSAI clamp-lock variant, or use an external pilot check valve.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAI80X355S
- ✓ 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-SI80X355S FAQ
Yes, the B04-SI80X355S is discontinued. The exact replacement is the SAI80X355S. The B04- prefix simply marked it as a construction-machinery dedicated variant of the SI80X355S. The SAI model is a dimensionally interchangeable ISO 15552 drop-in with the same 80 mm bore, 355 mm stroke, force, and G3/8 port.
This double-acting cylinder has a G3/8 port and provides 2513 N push and 2268 N pull at 0.5 MPa. At 0.7 MPa it pushes 3518 N, and 4523 N at 0.9 MPa. The theoretical maximum force is 513 kgf at 1.0 MPa. It operates at 30-800 mm/s with adjustable air cushions.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAI80X355S
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAI80X355S replacement — usually within 7-8 hours.