This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X75S, 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-SID50X75S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X75S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø50mm bore and 75mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID50X75S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ50 mm
- Stroke75 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM16×1.5
- StatusDiscontinued → B04-SAID50X75S
- 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-SID50X75S
The AirTAC B04-SID50X75S is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SID50X75S, mechanically identical to it. A rod exits both ends of the extruded aluminum barrel on a single piston, meaning both faces use the rod-side area and push/pull force is equal both ways at 825 N @0.5 MPa, 1154 N @0.7 MPa, and 1484 N @0.9 MPa. It features a Ø20 mm rod, M16x1.5 rod-end thread, G1/4 air port, 30 mm adjustable cushions, and a built-in magnet (-S) for legacy CS1-B/DS1-B switches.
This SID model is discontinued and end-of-life; the direct replacement is the SAID50X75S (same ISO 15552 interface, bore, stroke, force, G1/4 port, and mounting). The SAI replacement uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life, and adds SAIL/BSAI lock variants the SI line lacked. Double-rod benefits include anti-rotation and using the back rod to carry a sensor cam.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X75S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X75S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X75S |
| Bore size | Ø50 mm |
| Stroke | 75 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-SAID50X75S 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-SAID50X75S 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-SID50X75S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 50 | Bore size in mm. |
| ×75 | 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-SID50X75S Is Used
Excavator Linkage
Drives synchronized dual-tool mechanisms on heavy-equipment attachments where equal push and pull force is required.
Loader Gauge Arm
Provides anti-rotation stability for construction-machinery positioning arms using the double-rod geometry.
Crane Extension Cam
Uses the rear rod extension to carry a sensor cam for stroke positioning in tight heavy-equipment chassis.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X75S with the B04-SAID50X75S
To replace the discontinued B04-SID50X75S, order the direct replacement SAID50X75S, which reuses the exact ISO 15552 mounting interface (Basic, FA, LB, TC) without bracket changes. Size both ways by checking neighbor bores (40 mm or 63 mm) if you need to scale the equal both-ways force. A double rod is right when you need anti-rotation, symmetrical force, or a back rod to drive two tools/carry a sensor cam. Select the -S magnet for CS1-B/DS1-B switches. For strokes >=300 mm, verify side-load limits to prevent guide wear. A plain cylinder does not hold loads on air loss; use an external rod lock or SAIL/BSAI variant for held loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X75S
- ✓ 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-SID50X75S FAQ
Yes, the B04-SID50X75S is discontinued. The direct replacement is the SAID50X75S. The B04- prefix only marks it as the construction-machinery dedicated variant of SID50X75S; mechanically, all specs (bore, stroke, force, G1/4 port, M16x1.5 thread) are identical. The SAI replacement uses an upgraded piston seal and adds lock variants.
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. Speed is 30-800 mm/s. Air cushions are 30 mm at each end; they only decelerate near stroke end and do not hold loads on air loss.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X75S
Send us the quantity and destination. We confirm price, stock and lead time on the B04-SAID50X75S replacement — usually within 7-8 hours.