Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X175
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X175 is a genuine double-acting DOUBLE-ROD air cylinder: the Ø20mm piston rod extends from BOTH end caps, giving equal effective area — and therefore equal force — in push and pull. Ø50mm bore, 175mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ50 mm
- Rod (both ends)Ø20 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-SCD50X175
The B04-SCD50X175 is an AirTAC double-acting, double-rod cylinder where the piston rod extends through both end caps. Because the rod volume is subtracted on both sides, thrust is perfectly symmetrical: 825 N in either direction at 0.5 MPa, climbing to 1484 N at 0.9 MPa. The B04- prefix designates this as a construction-machinery dedicated variant, mechanically identical to the standard SCD50X175.
Featuring a 20 mm diameter rod on both ends and a 175 mm stroke, this model provides enhanced guidance and anti-rotation characteristics over a single-rod unit. It uses adjustable cushions (21 mm) to decelerate the piston near the end caps, and its retracted body length is based on the SCD A dimension of 207 mm. Note that the cushion only decelerates; it does not lock or hold the load if air pressure is lost.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X175 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X175 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø50 mm |
| Rod diameter | Ø20 mm (both ends) |
| Stroke | 175 mm |
| Rod configuration | Double rod — rod through both caps |
| Acting type | Double acting |
| Port size | PT1/4 |
| 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, 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 (Ø50mm, double rod)
| Pressure | Push force | Pull force |
|---|---|---|
| 0.5 MPa | 825 N | 825 N |
| 0.7 MPa | 1155 N | 1155 N |
| Max (@1.0 MPa) | 168 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-SCD50X175
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 50 | 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-SCD50X175 Is Used
Excavator Linkages
Drives symmetric pushing and pulling movements in heavy-duty equipment pilot linkages where equal force both ways prevents linkage binding.
Shuttle Transfer Tables
Moves parts across construction machinery assembly lines using both rod ends to carry tooling and maintain balanced bearing wear.
Non-Rotating Pushers
Handles component alignment in dusty environments where the dual-rod design offers better resistance to torsional twisting than a single rod.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD50X175 the Right Cylinder?
This 50 mm bore hits a solid mid-range force class of 825 N each way at 0.5 MPa. If your construction equipment needs less force, the 40 mm bore offers 528 N; stepping up to the 63 mm bore provides 1402 N. If you only need one-way actuation and do not require a rear rod for tooling or symmetrical bearing loads, a standard single-rod AirTAC SC cylinder is a lighter, more compact choice. For applications with heavy side loads, a dedicated guided cylinder is superior to relying on the through-rod alone.
To replace this unit, match these five points: 50 mm bore, 175 mm stroke, PT port thread, basic mounting (or an SCD-compatible accessory like F-SC50LB or F-SC50TC), and no built-in magnet. If your machinery requires position feedback, order the -S suffix variant to allow CMSG or DMSG sensors to mount on the barrel.
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-SCD50X175 FAQ
The B04- prefix indicates this is a construction-machinery dedicated variant of the SCD50X175. It is mechanically identical to the standard SCD model, offering the same 825 N equal push and pull force at 0.5 MPa, 20 mm rods, and PT1/4 ports, simply designated for heavy-equipment builders.
A double-rod cylinder provides identical push and pull forces (825 N each way at 0.5 MPa here) because the rod area is subtracted from both chambers. It also gives you a rear rod for mounting a stopper, sensor flag, or secondary tooling, and balances the bearing loads for smoother operation in construction machinery.
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