This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X350, 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 B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X350
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X350 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 350mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X350, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke350 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X350
- 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 B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X350
The AirTAC B04-SID50X350 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, yielding equal push and pull force (825 N at 0.5 MPa). The B04- prefix marks this as a construction-machinery dedicated variant, mechanically identical to the standard SID50X350. It features a 50 mm bore, G1/4 port, M16x1.5 rod thread, and 30 mm adjustable cushions. This SID model is discontinued; the direct replacement is the SAID50X350, which adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life.
Because both faces use the rod-side area, force is identical in both directions. A rear rod can carry a sensor cam or drive a second tool, and ISO 15552 mounting means you reuse existing FA, LB, or TC brackets. Note this SKU lacks the -S magnet, so it cannot accept magnetic switches. A plain cylinder drifts on air loss—cushions only decelerate, so use an external rod lock for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X350 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X350 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X350 |
| Bore size | Ø50 mm |
| Stroke | 350 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M16×1.5 |
| 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, 30 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID50X350 carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø50mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 982 N | 825 N |
| 0.7 MPa | 1374 N | — |
| Max (@1.0 MPa) | 200 kgf | |
The B04-SAID50X350 produces the same force from the same bore. Actual usable force is lower than theoretical; size with a margin.
Model Code: Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X350
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×350 | 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-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X350 Is Used
Excavator Linkage Actuation
Drives secondary construction-machinery covers or gates requiring equal push/pull force and anti-rotation stability from the double-rod design.
Heavy Equipment Part Transfer
Moves components on an assembly line where the rear rod simultaneously operates a downstream reject gate, saving space.
Loader Boom Synchronization
Balances loads in construction-machinery fixtures where identical force in both directions prevents linkage binding.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X350 with the B04-SAID50X350
To replace the discontinued B04-SID50X350, swap in the SAID50X350 directly—it matches the 50 mm bore, 350 mm stroke, G1/4 port, and ISO 15552 mounting interface without bracket changes. Size both ways by verifying the equal push/pull force (825 N @0.5 MPa) handles your load; if not, step up to the 63 mm bore (1402 N) or down to the 40 mm bore (528 N). Choose a double-rod cylinder when you need anti-rotation stability, equal force both ways, or a back rod to drive a second mechanism. Select FA, LB, or TC mounts per ISO 15552. If you need position sensing, you must select a -S magnet variant, as this SKU cannot take switches. For the 350 mm stroke, use external guides to prevent rod bending and side-load damage.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X350
- ✓ 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-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X350 FAQ
Yes, the B04-SID50X350 is discontinued. The direct replacement is the SAID50X350. The B04- prefix simply marks it as construction-machinery dedicated; mechanically it is identical to the SID50X350. The SAID50X350 shares the same 50 mm bore, 350 mm stroke, G1/4 port, and ISO 15552 mounting, but adds an upgraded piston seal.
Force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. Speed is 30-800 mm/s. The port is G1/4, the rod is Ø20 mm with an M16x1.5 thread, and it has 30 mm adjustable cushions. It operates at 0.15-1.0 MPa.
Related AirTAC SAI Cylinders
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