Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X175S
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X175S is a genuine double-acting DOUBLE-ROD air cylinder: the Ø16mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø40mm bore, 175mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke175 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X175S
The B04-SCD40X175S is an AirTAC double-acting, double-rod cylinder where the piston rod passes through both end caps. The B04- prefix designates this as a construction-machinery dedicated variant, mechanically identical to the standard SCD40X175S. Because the rod area is subtracted from both chambers, it generates an identical 528 N of thrust and retraction force at 0.5 MPa, climbing to 950 N at 0.9 MPa.
This 40 mm bore unit features a 175 mm stroke and a built-in magnet (-S) for mounting CMSG or DMSG sensors along the 191 mm body length A(SCD). The Ø16 mm rods protrude from both ends with M12x1.25 threads, utilizing 21 mm adjustable cushions to decelerate the piston at stroke limits. It is a genuine AirTAC component engineered for heavy-equipment applications.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X175S Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X175S |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 175 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| 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, 21 mm |
| Max stroke | Up to 1200 mm |
Specifications follow the official AirTAC SCD (double-rod) datasheet. Because the rod runs through both caps, the effective area is (bore² − rod²) in both directions. Confirm against the product label before installation. Thread options: PT (standard) / G.
Theoretical Output Force (Ø40mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 528 N | 528 N |
| 0.7 MPa | 739 N | 739 N |
| Max (@1.0 MPa) | 108 kgf | |
Push and pull are EQUAL on a double-rod cylinder — both chambers lose the rod area, so effective area = (bore² − rod²) each way. Actual usable force is lower than theoretical due to friction and back-pressure; size with a safety margin.
Model Code: Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X175S
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×175 | Stroke length in mm. |
| -S | Optional built-in magnet for sensor position sensing. |
Related types: SC (single rod), SCJ (adjustable stroke), SCT (multi-position). SCD mounting: Basic, FA, LB, TC, TCM1. Seals: TPU standard / H = Viton / N = NBR. Thread: blank = PT, G = G thread.
Where the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X175S Is Used
Construction Machinery Positioning
Ideal for heavy-equipment sub-systems requiring symmetric actuation, where the through-rod design ensures equal push and pull forces for reliable component shifting on site.
Shuttle Transfer Tables
The double-rod geometry provides excellent anti-rotation characteristics and allows tooling to be mounted on the rear rod, perfect for moving materials between two fixed stations.
Dual-Side Stopper Mechanisms
Using both rod ends to actuate stops or guides simultaneously ensures balanced loading on the cylinder bearings, extending service life in demanding industrial environments.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X175S the Right Cylinder?
Choose this 40 mm bore when an application demands equal force and speed in both directions, or requires a rear rod for mounting secondary tooling and stoppers. If your machine needs less thrust, stepping down to a 32 mm bore yields 345 N at 0.5 MPa; stepping up to a 50 mm bore provides 825 N. For jobs needing only unidirectional pushing, the single-rod SC series is lighter and more compact.
When replacing this unit, match the 40 mm bore, 175 mm stroke, PT1/4 port thread, basic mounting style, and the -S magnetic option. With a 175 mm stroke, the unsupported rod length is moderate, but always verify side-load conditions. For heavy off-center loads, an external guide or a dedicated guided cylinder is recommended to prevent rod bending and premature bearing wear.
Double-rod checklist
- ✓ Need equal force / speed both directions?
- ✓ Rear rod for tooling, stopper or sensor flag?
- ✓ Better rod guidance / anti-rotation?
- ✓ Port/thread type (PT/NPT/G)
- ✓ Magnet (-S) for sensors?
Installation & Maintenance Notes
- check Use clean air filtered to 40µm or finer.
- check Keep within 0.15 – 1.0 MPa operating pressure.
- check Keep BOTH rod ends clear of side load and interference.
- check Adjust end cushion screws for smooth stops.
- check Use SCD mounting accessory (FA / LB / TC / TCM1).
- check Installation by qualified personnel per AirTAC docs.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X175S FAQ
The B04- prefix indicates this is an AirTAC construction-machinery dedicated variant. It is mechanically identical to the standard SCD40X175S, offering the exact same 40 mm bore, 175 mm stroke, and 739 N force at 0.7 MPa, but is designated for heavy-equipment builders.
Yes, it equalizes it. Because the rod occupies space on both sides of the piston, the effective area is identical in both directions. This SCD40X175S cylinder provides 528 N of push and pull force at 0.5 MPa, unlike a single-rod cylinder which has a weaker pull stroke.
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