This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID40X500S, 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-SID40X500S
The AirTAC Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X500S is a double-acting ISO 15552 (orig. ISO 6431) profile-barrel cylinder with a Ø40mm bore and 500mm stroke, G1/4 air ports and adjustable end cushioning. This model is discontinued — the direct replacement is the B04-SAID40X500S, which matches its ISO interface, bore, stroke, force and mounting.
- BoreØ40 mm
- Stroke500 mm
- Port sizeG1/4
- Acting typeDouble acting
- Rod threadM12×1.25
- StatusDiscontinued → B04-SAID40X500S
- 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-SID40X500S
The AirTAC B04-SID40X500S is a double-acting, double-rod ISO 15552 cylinder where a rod exits both ends on one piston. The B04- prefix marks this as AirTAC's construction-machinery dedicated variant of the base SID40X500S, mechanically identical in every spec. Because both faces use the rod-side area, push and pull force are equal at 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. It features a 16 mm rod, M12x1.25 thread, G1/4 port, and 27 mm adjustable air cushions. This SID model is discontinued; the direct replacement is the SAID40X500S.
The SAI replacement uses an upgraded piston seal with two Y-shaped one-way elements for low start-up pressure and long life. A double-rod design prevents piston rotation and lets the back rod carry a sensor cam or drive a second tool. Note that a plain cylinder does not hold loads on air loss; the cushion only decelerates near stroke end.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X500S Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X500S |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID40X500S |
| Bore size | Ø40 mm |
| Stroke | 500 mm |
| Acting type | Double acting |
| Port size | G1/4 |
| Rod thread | M12×1.25 |
| 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, 27 mm |
| Max standard stroke | Up to 1200 mm |
Specifications follow the official AirTAC SI datasheet (now discontinued). The B04-SAID40X500S carries the same ISO 15552 ratings. Confirm against the product label before installation. Thread options: PT / G / NPT.
Theoretical Output Force (Ø40mm)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 628 N | 528 N |
| 0.7 MPa | 880 N | — |
| Max (@1.0 MPa) | 128 kgf | |
The B04-SAID40X500S 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-SID40X500S
| SI | ISO 15552 profile-barrel cylinder (discontinued). |
|---|---|
| 40 | Bore size in mm. |
| ×500 | 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-SID40X500S Is Used
Excavator Linkage Sync
Drives synchronized opposing plates on heavy-equipment linkage using equal both-ways force to prevent binding during repetitive digging cycles.
Loader Material Transfer
Pushes and retracts a dual-tool transfer arm on a loader, using the back rod to carry a sensor cam for precise position feedback.
Crusher Gantry Actuation
Actuates a counterweight gate on a construction-machinery gantry where anti-rotation stability is required over the 500 mm travel.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID40X500S with the B04-SAID40X500S
To replace the discontinued B04-SID40X500S, use the SAID40X500S. It is a direct swap retaining the exact ISO 15552 mounting interface, 40 mm bore, 500 mm stroke, G1/4 port, and equal both-ways force. Size both directions by checking neighbor bores: the 32 mm bore yields 345/483/621 N, while the 50 mm bore yields 825/1154/1484 N. A double rod is right when you need anti-rotation, a back-rod sensor cam, or two driven tools. Mounting options include Basic, FA, LB, and TC. The -S suffix means a piston magnet is present for CS1-B/DS1-B switches. For the 500 mm stroke, use external guides to prevent rod bending and side loads.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID40X500S
- ✓ 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-SID40X500S FAQ
Yes, the B04-SID40X500S is discontinued. The direct replacement is the SAID40X500S. The B04- prefix simply marks it as the construction-machinery dedicated variant; mechanically it is identical to the base SID40X500S. The SAID40X500S keeps the same ISO 15552 interface, bore, stroke, G1/4 port, and mounting.
Because it is a double-rod cylinder, force is equal both ways: 528 N @0.5 MPa, 739 N @0.7 MPa, and 950 N @0.9 MPa. The air port is G1/4. It operates at 0.15-1.0 MPa with a speed of 30-800 mm/s.
Related AirTAC SAI Cylinders
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