This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X125S, 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-SID50X125S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X125S 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-SAID50X125S, 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-SAID50X125S
- 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-SID50X125S
The AirTAC B04-SID50X125S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix designates it as the construction-machinery dedicated variant of the base SID50X125S, mechanically identical in every spec. Because a rod exits both ends on one piston, both faces use the rod-side area, making push and pull force equal at 825 N @0.5 MPa. This model is discontinued; the direct replacement is the SAID50X125S, which adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life.
The SAID50X125S preserves the exact G1/4 port, M16x1.5 rod thread, and 30mm adjustable cushions. The -S suffix indicates a built-in piston magnet for legacy CS1-B/DS1-B switches. Note that a plain cylinder does not hold loads on air loss; the cushion only decelerates, so use an external rod lock or SAIL/BSAI variant for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X125S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X125S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X125S |
| 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-SAID50X125S 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-SAID50X125S 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-SID50X125S
| 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-SID50X125S Is Used
Excavator Linkage Control
Drives dual-tool mechanisms on heavy equipment with equal push/pull force, leveraging the double-rod's anti-rotation stability for precise positioning in confined construction machinery bays.
Crusher Feed Gate
Actuates a heavy-duty material flow gate on aggregate crushers, using the back rod to carry a sensor cam while providing consistent 825 N force @0.5 MPa in both directions.
Loader Attachment Shift
Synchronizes an auxiliary attachment on earthmoving loaders, where the equal-both-ways force prevents sagging drift during bidirectional tooling operations.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X125S with the B04-SAID50X125S
Replace the discontinued B04-SID50X125S directly with the SAID50X125S, reusing the exact ISO 15552 mounting interface and FA, LB, or TC mounts. Size both ways by verifying the equal 825 N @0.5 MPa force fits your load, or step to neighbouring bores (40mm or 63mm) if more force is needed. A double rod is right when you need anti-rotation stability or want to drive two tools from one piston. The -S magnet supports legacy CS1-B/DS1-B sensors. For this 125mm stroke side-load is minimal, but for strokes >=300mm ensure guide alignment to prevent rod binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X125S
- ✓ 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-SID50X125S FAQ
Yes, the B04-SID50X125S is discontinued. The direct replacement is the SAID50X125S. The B04- prefix only marks it as the construction-machinery dedicated variant; the SAID replacement shares the exact 50mm bore, 125mm stroke, G1/4 port, and ISO 15552 mounting interface, but adds an upgraded piston seal.
Because it is a double-rod cylinder, force is equal both ways: 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. The air port is G1/4, the rod thread is M16x1.5, and it includes 30mm adjustable cushions at each end. Speed ranges from 30-800 mm/s.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X125S
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID50X125S replacement — usually within 7-8 hours.