Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125
The AirTAC Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125 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, 125mm stroke, PT1/4 ports and adjustable end cushioning.
- BoreØ40 mm
- Rod (both ends)Ø16 mm
- Stroke125 mm
- Port sizePT1/4
- Rod configDouble rod (through)
- CushionAdjustable, 21 mm
About the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125
The B04-SCD40X125 is an AirTAC double-acting, double-rod cylinder delivering 739 N of thrust in both directions at 0.7 MPa. The B04- prefix marks this as a construction-machinery dedicated variant, mechanically identical to the standard SCD40X125. A Ø16 mm piston rod passes through both end caps, yielding identical push and pull forces while providing extra guidance for external tooling.
Operating at speeds of 30-800 mm/s, this unit features adjustable cushions with a 21 mm stroke length to dampen end-of-travel impacts. The retracted body length A(SCD) is 191 mm. It uses a PT1/4 port and operates reliably between -20 and +70 C with its standard TPU seals.
Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125 Technical Specifications
| Model | Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125 |
|---|---|
| Series | SCD double-rod tie-rod cylinder |
| Bore size | Ø40 mm |
| Rod diameter | Ø16 mm (both ends) |
| Stroke | 125 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-SCD40X125
| SCD | Double-rod tie-rod cylinder series (rod out both ends). |
|---|---|
| 40 | Bore size in mm. |
| ×125 | 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-SCD40X125 Is Used
Excavator Linkages
Drives auxiliary mechanisms on heavy equipment where the B04- prefix ensures suitability for construction machinery environments.
Shuttle Transfer
Moves parts equally in both directions with 739 N force, using the through-rod to mount a stopper or flag on the rear side.
Non-Rotating Pushers
The dual-rod design provides better resistance to torsion than single-rod types, ideal for pushing loads without rotational drift.
Is the Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125 the Right Cylinder?
Choose this 40 mm bore when an application demands 739 N of symmetrical force at 0.7 MPa. If your machine requires less thrust, step down to the 32 mm bore (345 N at 0.5 MPa); if you need heavier shifting, the 50 mm bore offers 825 N at 0.5 MPa. A single-rod SC cylinder is preferable if you only need unidirectional force and want a shorter footprint.
For replacements, match the 40 mm bore, 125 mm stroke, PT1/4 thread, basic mounting, and confirm whether a magnetic piston is needed. With a 125 mm stroke, side-load bending on the unsupported rod is moderate; use an external guide rail if the load is heavy to prevent 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-SCD40X125 FAQ
The B04- prefix designates this as a construction-machinery dedicated variant of the SCD40X125. It is mechanically identical to the base model, offering the same 739 N equal push and pull force, PT1/4 port, and 125 mm stroke.
No, the 21 mm adjustable cushion only decelerates the piston near the stroke ends to reduce impact. It does not lock or hold the load. If the machine requires position holding without live air pressure, an external mechanical lock or pilot-operated check valve is necessary.
Authorized Export Seller
Genuine AirTAC parts produced by AirTAC factory.
1-Year Warranty
Covers non-human-caused product damage.
Fast Dispatch
Standard models usually ship in 3-4 days.
Fast Reply
Most inquiries answered within 7-8 hours.
Related AirTAC SCD Double-Rod Cylinders
Request a Quote for Airtac B04-SCD Specialized Standard Cylinder for Construction Machinery B04-SCD40X125
Send us the quantity and destination. We confirm price, stock and lead time — usually within 7-8 hours.