This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X125, 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-SID50X125
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X125 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 125mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X125, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke125 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X125
- 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-SID50X125
The AirTAC B04-SID50X125 is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends, making push and pull force equal at 825 N @0.5 MPa. The B04- prefix marks this as AirTAC's construction-machinery dedicated variant, mechanically identical to the base SID50X125 with a 50mm bore, 125mm stroke, and G1/4 air port. This SKU has no -S magnet and cannot support sensing.
This SID model is discontinued and replaced by the direct replacement SAID50X125, 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, it suits rigid heavy-equipment frames.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X125 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X125 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X125 |
| Bore size | Ø50 mm |
| Stroke | 125 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-SAID50X125 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-SAID50X125 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-SID50X125
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×125 | 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-SID50X125 Is Used
Excavator Linkage
Equal-both-ways force drives dual-tool coupler actions on construction machinery without stroke deflection.
Loader Boom Guide
The double-rod geometry provides anti-rotation stability for heavy-equipment boom alignment under off-center loads.
Crane Fixture Sync
The extending back rod mechanically syncs a secondary clamp on a crane fixture, ensuring parallel gripping.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X125 with the B04-SAID50X125
To replace the discontinued B04-SID50X125, install the direct replacement SAID50X125; it matches the 50mm bore, 125mm stroke, G1/4 port, M16x1.5 thread, and FA/LB/TC mountings. Size both directions by checking equal-both-ways force against neighboring bores. A double rod is right when you need anti-rotation stability or a back rod to carry a sensor cam. This SKU lacks the -S magnet, so no switches can be mounted. For stroke lengths >=300, verify side-load limits. Air cushions only decelerate; use an external rod lock or SAIL/BSAI variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X125
- ✓ 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-SID50X125 FAQ
Yes, the B04-SID50X125 (construction-machinery dedicated variant of SID50X125) is discontinued. The direct replacement is the SAID50X125, sharing the identical ISO 15552 interface, 50mm bore, 125mm stroke, G1/4 port, and equal both-ways force.
Force is equal both ways at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. Speed is 30-800 mm/s. The G1/4 port and 30mm adjustable cushion are fixed by the 50mm bore. It cannot hold loads without live air.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X125
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID50X125 replacement — usually within 7-8 hours.