This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X50, 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-SID50X50
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X50 is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 50mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X50, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke50 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X50
- 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-SID50X50
The AirTAC B04-SID50X50 is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SID50X50, 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, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. This model is discontinued and the direct replacement is the SAID50X50, sharing the same 50mm bore, 50mm stroke, G1/4 port, M16x1.5 rod thread, and 30mm adjustable cushion.
The SAI replacement upgrades the piston seal to two Y-shaped one-way elements for low start-up pressure and long life. The double-rod design provides anti-rotation stability and allows the back rod to drive a second tool. Note this non-magnetic SKU cannot take a sensor switch, and air cushions only decelerate; use an external rod lock or SAIL/BSAI variant for load holding.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X50 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X50 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X50 |
| Bore size | Ø50 mm |
| Stroke | 50 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-SAID50X50 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-SAID50X50 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-SID50X50
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×50 | 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-SID50X50 Is Used
Excavator Linkage Actuation
Drives secondary heavy-equipment mechanisms where equal push and pull force is mandatory for balanced hydraulic-like motion in construction machinery.
Synchronized Material Transfer
Uses the dual-rod anti-rotation property to push and pull heavy construction components between stations without torsional deflection.
Dual-Tool Die Handling
The protruding rear rod simultaneously operates a secondary clamping or ejecting tool on heavy-equipment assembly jigs, saving space.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X50 with the B04-SAID50X50
To replace the discontinued B04-SID50X50, specify the SAID50X50, which is a direct swap retaining the ISO 15552 mounting interface, 50mm bore, 50mm stroke, and G1/4 port. Size both ways by verifying the equal push/pull force of 825 N @0.5 MPa meets your requirement, or step to neighbour bores (40mm or 63mm) if more or less force is needed. A double rod is right when you need anti-rotation resistance or want the rear rod to carry a sensor cam or second tool. Reuse FA, LB, or TC mounts directly. Because this SKU lacks the -S magnet, it cannot accept legacy CS1-B/DS1-B sensors. For this 50mm stroke, side-load is minimal, but for any stroke >=300mm, ensure guide alignment to prevent binding.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X50
- ✓ 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-SID50X50 FAQ
Yes, the B04-SID50X50 (construction-machinery dedicated variant of SID50X50) is discontinued. The direct replacement is the SAID50X50, which matches the 50mm bore, 50mm stroke, G1/4 port, and ISO 15552 mounting interface.
As 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 operates at 30-800 mm/s with a 30mm adjustable cushion at each end.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X50
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID50X50 replacement — usually within 7-8 hours.