DZR brass fittings are used when ordinary brass is not enough for the water conditions in a piping system. The key issue is dezincification-a corrosion process in which zinc is selectively removed from brass, leaving behind a weak, porous copper-rich structure.

For plumbing, heating and water-treatment projects, the material decision should therefore be made from the actual water conditions, temperature, pressure, connection method and required standard.

HBFittings lists DZR brass CW602N and CW617N in its material range, alongside CA360, CA345, CA377, lead-free C46500 and stainless steel 304/316. The company supplies brass pipe fittings, hose barb fittings, push-fit fittings, hydraulic fittings and other precision-machined components for water treatment, HVAC & plumbing, food and beverage, industrial automation and related applications.

1. What Is DZR Brass?

DZR means Dezincification Resistant Brass.

Ordinary brass contains copper and zinc. Under certain water conditions, zinc can be selectively removed from the alloy. This is called dezincification.

The problem is not simply surface discoloration. Severe dezincification can produce:

Porous areas
Loss of mechanical strength
Leakage
Reduced pressure resistance
Premature fitting failure

DZR brass is developed to provide improved resistance to this corrosion mechanism.

For buyers working on European plumbing projects, CW602N and CW617N are two material designations worth specifying rather than simply writing "DZR brass."

HBFittings specifically lists both CW602N and CW617N as DZR brass materials.

2. When Should You Choose DZR Brass?

DZR brass should be considered when the fitting will remain in contact with water under conditions that can increase dezincification risk.

Typical applications include:

Hot Water Systems

Hot water can accelerate some corrosion mechanisms. DZR material can be considered where the system specification calls for dezincification-resistant brass.

Domestic Plumbing

DZR fittings are widely relevant to plumbing projects where long-term water exposure is important.

Commercial Building Water Supply

Hotels, apartments, offices and public buildings often have extensive water distribution networks. Replacing a failed concealed fitting is far more difficult than replacing an exposed component.

Heating Systems

Heating circuits combine water, elevated temperature and continuous operation. Material selection should be based on the actual system conditions.

Water Treatment

Water-treatment equipment may encounter different water chemistries from ordinary domestic plumbing. DZR, lead-free brass or stainless steel can be considered according to the fluid.

HBFittings lists water treatment systems and HVAC & plumbing among its application industries.

3. CW602N vs CW617N

One of the first questions in an RFQ should be:

Which DZR brass grade is required?

HBFittings identifies:

CW602N
CW617N

as DZR brass options.

The company's published technical article also discusses CW617N as a European-standard brass material and notes its use in water-heating valves and pipe fittings, particularly for products exported to Europe.

Do not treat the two grades as interchangeable without checking the applicable product standard.

For an OEM order, specify:

Material: CW602N DZR Brass

or:

Material: CW617N DZR Brass

rather than:

Material: DZR Brass

That small difference makes the purchase specification much clearer.

4. DZR Brass vs Standard Brass

Item	Standard Brass	DZR Brass
Copper-zinc alloy	Yes	Yes
Resistance to dezincification	Application dependent	Improved
General plumbing	Suitable for many applications	Suitable where DZR is specified
Hot-water systems	Depends on material/specification	Often considered
Corrosion-sensitive water	May require further assessment	Better direction
Cost	Usually lower	Usually higher
Material specification	Brass grade	CW602N / CW617N or specified DZR grade

The important point is that DZR is not simply a surface coating. It is a material characteristic that must be controlled through the alloy and manufacturing process.

5. Do Not Choose DZR by Application Name Alone

"Water system" is too broad to determine the brass grade.

Before purchasing, collect:

Water temperature
Water chemistry
Chloride level
pH
Pressure
Flow conditions
Continuous or intermittent operation
Applicable local standard

For example, a cold-water residential line and a high-temperature heating circuit should not automatically receive the same material specification.

The correct decision comes from the service conditions, not simply the product category.

6. DZR Brass for Hot Water

Hot-water systems are one of the applications where material selection deserves particular attention.

Check:

Continuous operating temperature
Maximum temperature
System pressure
Water chemistry
Required service life
Local plumbing standard

A DZR fitting may be suitable for the material requirement, but the fitting's actual pressure-temperature rating still needs to be confirmed.

Do not use a generic DZR material statement as a substitute for a product-specific pressure and temperature rating.

7. DZR Brass for Drinking Water

DZR and lead-free are not the same thing.

This distinction is important.

DZR

Addresses resistance to dezincification.

Lead-Free Brass

Addresses lead-content requirements.

A drinking-water project may require one, the other, or both depending on the market and product standard.

HBFittings offers DZR CW602N/CW617N as well as lead-free C46500. Its published company information also identifies NSF, UPC and lead-free compliance capabilities, while the site displays NSF 61 and SGS NSF 372-2024 documentation for water-system applications.

For a potable-water project, specify both requirements separately:

Material: DZR brass, specified grade
Lead requirement: Applicable potable-water / lead-free standard

8. DZR Brass vs Lead-Free Brass

Requirement	DZR Brass	Lead-Free Brass
Dezincification resistance	Main purpose	Depends on grade
Lead control	Not automatically lead-free	Main purpose
Drinking water	May be suitable if certified	Common choice
Hot water	Strong candidate where specified	Depends on grade
European plumbing	CW602N/CW617N commonly specified	Depends on project
Material selection	Water corrosion	Lead regulation + application

A buyer should therefore avoid saying:

"We need DZR because it is drinking water."

The specification should identify both corrosion resistance and lead compliance.

9. Select the Right Fitting Type

HBFittings' product structure covers several brass connection types, including:

Brass pipe fittings
Hose barb fittings
Compression fittings
Push-fit fittings
PEX fittings
Hydraulic fittings
Pressure-gauge accessories

Its brass fittings are produced through CNC machining and automated production processes.

Threaded Fittings

Suitable when the existing pipe or equipment uses:

NPT
BSPP
BSPT
Metric threads

Compression Fittings

Useful for mechanical tube connections where soldering or welding is not wanted.

Push-Fit Fittings

Useful where fast installation is important.

Hose Barb Fittings

Used with flexible hose and tubing.

The fitting type must match the pipe, tube or hose-not just the nominal diameter.

10. Check the Thread Standard

A DZR brass fitting with the wrong thread is still the wrong fitting.

Confirm:

Thread type
Thread size
Male or female
Thread length
Tapered or parallel thread

HBFittings' pressure-gauge accessory products show thread options including NPT, BSPP and BSPT, demonstrating the need to specify the thread system in the purchase order.

For example:

Correct

1/2" Female BSPP DZR Brass Adapter

Incomplete

1/2" DZR Brass Adapter

11. Check Pressure and Temperature

DZR Brass Fittings Selection Guide7826

Material grade alone does not determine the maximum working pressure.

The final rating depends on:

Fitting geometry
Wall thickness
Connection design
Thread depth
Seal design
Temperature
Manufacturing quality

For example, HBFittings' DZR brass pressure test plug page lists a 500 psi pressure-resistant limit for brass, connections from 1/8" to 1/2", and an operating temperature limit of -40 to 150°C for that particular product.

That rating belongs to the specific test plug and should not be applied to all DZR brass fittings.

When buying elbows, tees, adapters or valves, request the rating for the exact model.

12. Consider the Manufacturing Process

For DZR brass fittings, material control should extend from the raw material to the finished component.

A typical production route can involve:

Raw Brass → Forging → CNC Machining → Deburring → Surface Treatment → Inspection → Pressure Testing → Packing

HBFittings states that it uses full CNC machining, automated production lines and advanced testing equipment. The company also says it performs inspection before shipment.

For OEM buyers, ask whether the fitting is:

Machined from brass bar
Hot forged then machined
Produced using another forming process

This matters when purchasing thousands or hundreds of thousands of pieces.

13. DZR Brass Machining and Forging

Different fitting designs require different manufacturing approaches.

CNC Machining

Useful for:

Adapters
Nipples
Gauge accessories
Hose fittings
Small precision components

Forging + CNC Machining

Useful for:

Elbows
Tees
Valve bodies
Heavy-duty fitting bodies
High-volume OEM components

HBFittings describes itself as a manufacturer of precision-machined parts and offers engineering design, drawing optimization and prototyping for OEM/ODM projects.

14. Surface Finish

Depending on the application, DZR brass fittings can have different surface finishes.

Common requirements include:

Natural brass
Nickel plating
Chrome plating
Special OEM finish

The finish should not be confused with the DZR property itself.

For example:

Nickel-plated DZR brass

contains two separate specifications:

Base material: DZR brass
Surface: Nickel plating

Both should appear on the drawing or purchase order.

15. DZR Brass Material Certificate

For commercial and OEM purchases, request material documentation.

A good material-control package can include:

Material grade
Chemical composition
Batch/heat number
Material certificate
Production lot
Inspection report

HBFittings states that its quality system includes inspection laboratories and advanced testing equipment, and that its products are supported by ISO, NSF, UPC and lead-free compliance documentation.

For a critical project, buyers can also specify third-party inspection before shipment.

16. How to Select CW602N

Choose CW602N when the project specification explicitly calls for this DZR brass grade.

Before ordering, confirm:

Material

CW602N DZR Brass

pplication

Plumbing
Water distribution
Heating
Water treatment

Connection

Threaded
Compression
Custom

Certification

Confirm the required European or project-specific standard.

Manufacturing

Confirm:

Forged or machined
CNC dimensions
Thread standard
Pressure test

HBFittings lists CW602N as one of its DZR brass materials.

17. How to Select CW617N

CW617N is another important grade in the HBFittings material portfolio.

The company's technical article identifies CW617N as a European-standard brass and describes its application in water-heating valves, pipe fittings and gas/water nozzles. It also notes that DZR brass and CW617N are among the materials supplied for markets including Australia, Italy and the UK.

For European-oriented projects, the buyer should provide the exact standard required rather than assuming that every CW617N product has identical certification.

18. DZR Brass for European Plumbing Projects

European plumbing specifications often pay close attention to dezincification resistance.

When preparing an RFQ for Europe, include:

Exact material grade
Applicable EN standard
Thread standard
Pipe size
Pressure class
Temperature range
Potable-water requirement if applicable
Certification

HBFittings reports that its products are sold into Europe and other developed markets and specifically identifies CW602N/CW617N among its material offerings.

This makes DZR brass a useful product category for HBFittings' European plumbing business rather than merely a technical material option.

19. DZR Brass for Australia and UK Projects

The selection should follow the destination-market specification.

HBFittings' published CW617N article states that materials supplied to Australia, Italy and the UK include DZR brass, CW617N and C46500.

For a buyer, this means the RFQ should state:

Destination market: UK / Australia

and then list the required certification and material standard.

Do not rely on the supplier to guess the regulatory requirement from the destination country alone.

20. DZR Brass vs Stainless Steel

DZR brass is not automatically the best material for every corrosive environment.

HBFittings offers SS304 and SS316 as alternatives to brass.

Requirement	DZR Brass	SS304	SS316
General plumbing	Excellent	Good	Good
Dezincification resistance	Excellent direction	Not applicable	Not applicable
Chloride-rich environment	Needs assessment	Limited	Better
Cost	Lower	Higher	Higher
Machining	Easier	More demanding	More demanding
Potable water	Depends on certification	Depends on certification	Depends on certification
Industrial corrosion	Application dependent	Good	Very good

If the fluid is highly corrosive or contains significant chlorides, ask the supplier to compare DZR brass with SS316 rather than automatically selecting brass.

21. DZR Brass Selection for Water Treatment

Water-treatment equipment is one of HBFittings' listed application industries.

For this type of project, ask for:

Fluid

Municipal water
Filtered water
Process water
Treated water

Chemistry

pH
Chloride
Chemical additives

Operating conditions

Pressure
Temperature
Flow rate

Compliance

Potable water?
NSF?
Local certification?

The answer may lead to DZR brass, lead-free brass C46500 or stainless steel rather than one universal material.

22. DZR Brass Selection for HVAC

HBFittings lists HVAC & plumbing among its application industries.

In HVAC systems, DZR brass fittings can be considered for:

Chilled-water circuits
Hot-water circuits
Heat exchangers
Pump connections
Instrumentation
Pressure/temperature test points

HBFittings' DZR brass test plug is specifically described for hot and chilled water systems, heat exchangers and pumps.

This is a useful example of selecting the material around the actual system rather than treating DZR brass as a generic plumbing material.

23. 8 Questions to Ask Before Buying

Before sending an RFQ to HBFittings, prepare these eight points:
1. Which DZR grade?
CW602N or CW617N?
2. What is the fluid?
Water, treated water, hot water, chilled water or another medium?
3. What is the temperature?
Normal and maximum.
4. What is the pressure?
Working and maximum.
5. What connection is needed?
NPT, BSPP, BSPT, compression, push-fit or another type?
6. What size?
Nominal pipe size or tube OD.
7. Is potable-water certification required?
NSF or another market-specific standard?
8. Is it a standard or OEM fitting?
If custom, provide a drawing.

24. DZR Brass Fittings RFQ Example

A good RFQ should look something like this:

Product: DZR Brass 90° Elbow
Material: CW617N DZR Brass
Connection: Female × Female
Thread: BSPP
Size: 1/2" × 1/2"
Application: Hot Water Plumbing
Working Pressure: Project specification
Operating Temperature: Project specification
Certification: Applicable plumbing standard
Finish: Natural Brass
Quantity: 30,000 pcs
Inspection: Dimensional + leakage inspection
Packaging: Export carton

This gives the manufacturer a usable technical specification.

25. HBFittings DZR Brass Manufacturing Capability

For DZR brass buyers, HBFittings has several relevant capabilities:

DZR brass CW602N

DZR brass CW617N

CNC machining

Automated production

Testing equipment

OEM/ODM engineering support

Drawing optimization

Prototyping

Inspection before shipment

The company states that it has more than 17 years of manufacturing experience and offers brass fittings, stainless steel fittings, push-fit products, hydraulic components and valves.

It also states that its products serve North America, Europe and other developed markets.

26. DZR Brass Fittings Selection Matrix

Requirement	Standard Brass	CW602N	CW617N	C46500	SS316
General plumbing	✓	✓	✓	✓	✓
Dezincification concern	△	✓	✓	Depends on specification	-
Potable water	Depends on certification	Depends	Depends	Strong candidate	Depends
Lead-free requirement	Depends	Depends	Depends	Designed for lead-free applications	Yes, but separate certification applies
Hot water	Depends	✓	✓	Depends	✓
High chloride environment	△	△	△	△	✓
OEM machining	✓	✓	✓	✓	✓
European DZR specification	-	✓	✓	-	-