This model is discontinued
AirTAC has phased out the SI series. You can still order this code here: we ship the direct replacement B04-SAID50X75, 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-SID50X75
The AirTAC B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X75 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-SAID50X75, 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-SAID50X75
- 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-SID50X75
The AirTAC B04-SID50X75 is a double-acting, double-rod ISO 15552 cylinder where the B04- prefix marks it as the construction-machinery dedicated variant of the base SID50X75, mechanically identical in every spec. A rod exits both ends on one piston, meaning both faces use the rod-side area and push/pull force is equal both ways (825 N @0.5 MPa). It features a 50mm bore, G1/4 air port, M16x1.5 rod thread, and 30mm adjustable cushions at each end. This SID model is discontinued; the direct replacement is the SAID50X75, which adds an upgraded two-piece Y-shaped piston seal for lower start-up pressure and longer life.
Because the second rod drives a sensor cam or a second tool while resisting rotation, it is ideal for heavy-equipment builders. Without a -S suffix, this SKU has no magnet and cannot take a switch. A plain cylinder does not hold loads on air loss; cushions only decelerate, so use an external rod lock for held loads.
Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X75 Technical Specifications
| Model | Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X75 |
|---|---|
| Series | SI ISO 15552 profile cylinder (discontinued) |
| Replacement | B04-SAID50X75 |
| 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-SAID50X75 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-SAID50X75 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-SID50X75
| 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-SID50X75 Is Used
Excavator Linkage Control
Equal both-ways force on a 75mm stroke actuates heavy-equipment covers or gates, with the second rod preventing rotation under off-center loads.
Loader Attachment Shift
The double-rod layout drives a secondary cam or mechanical stop while maintaining identical push and pull thrust for synchronized attachment positioning.
Crusher Feed Gate
Provides 825 N @0.5 MPa of equal thrust to open and close a heavy feed gate on construction-machinery crushers, decelerating smoothly via 30mm cushions.
Replacing the Airtac B04-SID Construction Machinery Special ISO Standard Cylinder B04-SID50X75 with the B04-SAID50X75
To replace the discontinued B04-SID50X75, specify the SAID50X75 (insert an A after the leading S); it reuses the exact ISO 15552 mounting interface, G1/4 port, and 75mm stroke. Size both ways by checking the equal-both-ways force: this 50mm bore gives 825 N @0.5 / 1154 N @0.7 / 1484 N @0.9. If sizing up or down, verify neighboring bores (40mm or 63mm) against your load, as force is identical in extend and retract. Choose a double-rod when you need anti-rotation or must drive two tools. Mounting options include Basic, FA, LB, and TC. For stroke lengths >=300mm, verify side-load limits. Note: without a -S magnet, this SKU cannot support sensing.
Replacement checklist
- ✓ Same ISO 15552 interface → B04-SAID50X75
- ✓ 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-SID50X75 FAQ
Yes, the SID line is discontinued. The direct replacement is the SAID50X75. The B04- prefix simply marks it as the construction-machinery dedicated variant of SID50X75. The SAID50X75 matches the ISO 15552 interface, G1/4 port, and force, while adding 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 bore is 50mm, the air port is G1/4, and the rod thread is M16x1.5. Speed is 30-800 mm/s. Do not use a single-rod push value.
Related AirTAC SAI Cylinders
Request a Quote for the B04-SAID50X75
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