This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X400, 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-SID50X400
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X400 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 400mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X400, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke400 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X400
- 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-SID50X400
The AirTAC B04-SID50X400 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, yielding equal force in both directions (825 N at 0.5 MPa). The B04- prefix marks this as a construction-machinery dedicated variant, mechanically identical to the standard SID50X400. It features a 50mm bore, G1/4 port, M16x1.5 rod thread, and 30mm adjustable cushions. This SID model is discontinued; the direct replacement is SAID50X400, which reuses the exact ISO 15552 mounting interface and adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure.
Because the second rod acts as an anti-rotation guide and can drive a second tool simultaneously, double-rod designs excel in heavy-equipment frames. With no -S suffix, this SKU lacks a magnet and cannot accept reed switches. Note that air cushions only decelerate; for load holding on air loss, use an external rod lock or the SAIL/BSAI lock variants.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X400 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X400 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X400 |
| Bore size | Ø50 mm |
| Stroke | 400 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-SAID50X400 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-SAID50X400 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-SID50X400
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×400 | 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-SID50X400 Is Used
Excavator Linkage Control
Equal push/pull force drives dual-action mechanical linkages on heavy equipment, preventing uneven wear.
Crusher Feed Alignment
The second rod resists rotational torque during material handling, keeping construction aggregate flows aligned.
Loader Pin Extraction
Drives assembly tooling from both ends to press and remove heavy machinery pins without twisting the fixture.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X400 with the B04-SAID50X400
To replace the discontinued B04-SID50X400, swap directly to the SAID50X400, matching the 50mm bore, 400mm stroke, G1/4 port, and ISO 15552 mounting footprint (Basic, FA, LB, TC). Size both directions using the equal-both-ways force: 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at 0.9 MPa. If higher force is needed, step up to the 63mm bore (1402 N at 0.5 MPa); if less is needed, drop to the 40mm bore (528 N at 0.5 MPa). Choose a double-rod cylinder when anti-rotation stability or dual-tool actuation is required. For this 400mm stroke, external guides are recommended to prevent rod bending under side loads. This non-magnetic SKU cannot take sensors.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X400
- ✓ 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-SID50X400 FAQ
Yes, the B04-SID50X400 (construction-machinery dedicated variant of SID50X400) is discontinued. The direct replacement is the SAID50X400, which shares the identical ISO 15552 mounting interface, 50mm bore, 400mm stroke, G1/4 port, and equal-both-ways force, while adding an upgraded piston seal.
Because it is a double-rod cylinder, force is equal both ways: 825 N at 0.5 MPa, 1154 N at 0.7 MPa, and 1484 N at 0.9 MPa. The bore is 50mm, the air port is G1/4, the rod thread is M16x1.5, and speed is 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X400
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