跳到内容 Bulkhead anchor couplings are essential components for creating sealed and stable connections through tank walls, equipment housings, process vessels, and structural panels. The choice of material—from plastics like PVC, CPVC, PP to metals like brass，carbon steel ,stainless steel—directly affects durability, chemical resistance, and performance.
Bulkhead anchor couplings can be grouped into four main material families:
Plastic: PVC, CPVC, PP
Carbon Steel
Stainless Steel: 201,304, 316
Brass / Copper Alloy
Below is a deep dive into the characteristics and best applications
Plastic bulkhead anchor couplings are widely used in fluid handling systems, tanks, aquaculture, light industrial equipment, and general plumbing. Their strength-to-weight ratio, corrosion resistance, and low cost make them popular.
This is the only material category appropriate for truck and trailer applications, especially in fuel, hydraulic, air brake, or structural connection systems.
High mechanical strength
Excellent fatigue resistance
Able to withstand vibration, shock loading, and heavy dynamic forces
Suitable for high-pressure lines (fuel, hydraulic, pneumatic)
Common in heavy-duty industrial & transportation sectors
Carbon steel bulkhead anchor couplings ensure stable, leak-free, and secure connections through truck bulkheads, chassis walls, or trailer tanks.
Hydraulic hose passes through steel bulkheads
Fuel tank wall connections
Air brake or pneumatic system bulkhead transitions
Mounting anchor points for pressure lines
Carbon steel provides the required structural strength and impact resistance that plastics, brass, and even some stainless steels cannot match in mobile environments.
Carbon steel bulkhead anchor coupling use the NPT thread design ,the threads feature a tapered design (1:16) that tightens as the male and female threads engage, creating a reliable mechanical seal. With a 60° thread angle, NPT threads provide excellent leak resistance and pressure handling when combined with PTFE tape or thread sealant. Their tapered profile also ensures durability under vibration and high pressure, making them a standard choice in U.S. and Canadian industrial and commercial applications. NPT threads conform to ANSI/ASME B1.20.1, ensuring compatibility and reliability across a wide range of piping and fluid systems. This type bulkhead anchor coupling have the advantage of High Pressure Resistance ,Self-Sealing Capability,Durability Under Vibration,Versatile Material Compatibility,Ease of Installation.
Stainless Steel Bulkhead Anchor Coupling is a high-quality 316 stainless steel fitting designed for secure, leak-proof connections through tank walls and panels. Perfect for applications ranging from 55-gallon barrels to 10,000-gallon storage tanks, this bulkhead anchor coupling excels in industrial, agricultural, and water treatment systems. Its NPT threaded design allows easy attachment of internal siphons or external valves, while the Buna-N gasket ensures chemical resistance and safe use with potable water, diesel fuel, liquid feed, and many other liquids. Designed with installer-friendly grooves, it can be tightened securely without the body moving, making it ideal for both field professionals and DIY enthusiasts. Compatible with tanks up to 5/8″ wall thickness, this versatile bulkhead anchor coupling is suitable for oil and gas, reverse osmosis, rainwater harvesting, and indoor farming operations.
The 3/4″ Brass Bulkhead Anchor Coupling is crafted from high-quality brass, offering excellent corrosion resistance and long-lasting durability for fluid systems. Ideal for tanks, barrels, and panels up to 5/8″ wall thickness, this brass fitting provides a secure, leak-proof connection for potable water, rainwater harvesting, liquid feed, and many industrial liquids. Its NPT threaded design ensures easy attachment of internal pipes or external valves, while the EPDM gasket guarantees safe sealing and chemical compatibility. With installer-friendly grooves, this coupling stays stable during tightening, making it perfect for both DIY projects and professional installations. Lightweight yet robust, brass bulkhead anchor couplings are widely used in plumbing, agricultural, HVAC, and water treatment systems worldwide.
Good corrosion resistance
Easy machining
Stable performance in moderate pressure environments
| Material | Type / Condition | HRC (Rockwell C) Approx. |
|---|---|---|
| Copper | Pure copper (e.g., C1100, C14500) | <10 (very soft) |
| Copper Alloy | Brass 57-3 (CuZn) | 15–25 |
| Stainless Steel | 201 (Austenitic) | ~15–20 |
| Stainless Steel | 304 (Austenitic) | ~17–22 |
| Stainless Steel | 316 (Austenitic) | ~18–22 |
| Carbon Steel | 1020 (annealed) | 5–10 |
| Carbon Steel | 1045 (annealed) | 15–20; quenched & tempered: 25–40 |
| Plastic | PP (Polypropylene) | 5–15 (very soft; usually measured in Barcol) |
| Plastic | PVC (Polyvinyl Chloride) | 5–20 (depends on additives) |
| Plastic | CPVC (Chlorinated PVC) | 10–20 (slightly harder than PVC) |
Notes:
Copper and plastics are usually measured in HRB or Barcol hardness; HRC is only approximate.
Austenitic stainless steels (201/304/316) cannot be hardened by heat treatment; HRC is relatively low, but cold working can slightly increase hardness.
Carbon steels can achieve higher HRC after quenching & tempering.
Bulkhead anchor couplings come in many materials, each optimized for specific industrial environments. Plastics like PVC, CPVC, and PP are ideal for chemical tanks and light-duty systems. Stainless steel suits corrosive industrial processes, while brass is a versatile option for plumbing and fuel transfer setups.
But for trucks and trailers, only carbon steel bulkhead anchor couplings deliver the strength, vibration resistance, and durability required for mobile heavy-duty use.
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