Leaded Brass Hollow Rods: C36000, CW614N and IS 319 Grades

Leaded Brass Hollow Rods

Leaded brass hollow rods are a practical choice when a machined component needs a bore and the job involves producing the same part repeatedly. Starting with a hollow bar can save the time spent drilling solid stock and reduce the amount of brass that ends up as machining waste. Grades such as C36000 and CW614N are widely associated with free machining brass, making them suitable for precision turned components, fittings and valve parts. The right grade and dimensions depend on the component design, machining process and material specification. Amardeep can be contacted to discuss leaded brass hollow rod requirements, subject to confirmation of the available product range.

Specifications of Leaded Brass Hollow Rods

Parameter

Details

Product

Leaded brass hollow rods, also known as leaded brass hollow bars

Product Shape

Round hollow section

Grades

C36000, CW614N, CW617N, C37700 and applicable IS 319 grades, subject to confirmation

Standards

EN 12168, ASTM B16, ASTM B453, ASTM B124 and IS 319, as applicable to the grade and product form

Outside Diameter

To be confirmed according to manufacturing capability

Bore

To be confirmed according to manufacturing capability

Wall Thickness

Determined by the outside diameter, bore and applicable dimensional tolerance

Length

Random length or cut to length, subject to availability

Lead content

1.5 to 3.7 per cent depending on grade

Machinability

C36000 is the reference free cutting brass at 100 on the machinability scale. Other grades are rated against it.

Dimensional tolerance

Agreed with the order

Temper

As manufactured, half hard, hard or stress relieved, subject to confirmation

Surface Finish

Bright drawn or as extruded, subject to confirmation

Packing

Bundles or other packing arrangements according to order requirements

Documentation

Material Test Certificate according to the agreed purchase requirements

Leaded Brass Hollow Rods Chemical Composition

Grade

Copper Cu Percent

Lead Pb Percent

Iron Fe Maximum Percent

Zinc

C36000

60.0 to 63.0

2.5 to 3.7

0.35

Remainder

CW614N

57.0 to 59.0

2.5 to 3.5

0.30

Remainder

CW617N

57.0 to 59.0

1.6 to 2.5

0.30

Remainder

C37700

58.0 to 61.0

1.5 to 2.5

0.30

Remainder

IS 319

Confirm applicable grade

Confirm applicable grade

Confirm applicable grade

Remainder

Mechanical Properties of Leaded Brass Hollow Rods

Property

Annealed

Half hard, cold drawn

Tensile strength

About 340 MPa (49 ksi)

About 400 MPa (58 ksi)

Yield strength

About 125 MPa (18 ksi)

About 310 MPa (45 ksi)

Elongation

About 50%

About 25%

Hardness

About 35 to 45 HRB

About 78 to 80 HRB

Leaded Brass Hollow Rods Physical Properties

Property (grade to be stated)

SI

Imperial

Density

8.39 g/cm3

0.303 lb/in3 at 68 F

Specific gravity

8.39

8.39

Melting range

899 to 904 °C (solidus to liquidus)

1650 to 1660 F

Coefficient of thermal expansion

20.9 micrometres per metre per kelvin, 20 to 300 °C

11.6 millionths per F, 68 to 572 F

Thermal conductivity

About 123 W/m K at 20 °C

71.0 Btu per foot per hour per F at 68 F

Electrical conductivity

28 %IACS at 20 °C

28 %IACS at 68 F

Electrical resistivity

About 0.062 micro ohm metre

37.0 ohm circular mil per foot at 68 F

Specific heat

About 377 J/kg K

0.09 Btu per pound per F at 68 F

Modulus of elasticity in tension

About 103 GPa

15000 ksi

Modulus of rigidity

About 39 GPa

5600 ksi

Equivalent Grades of Leaded Brass Hollow Rods

Grade

UNS

EN

JIS and note

C36000

C36000

CW603N (CuZn36Pb3), nearest EN

C3604, nearest JIS

CW614N

No exact UNS

CW614N (CuZn39Pb3)

C36000 is the usual ASTM substitute but is not identical

CW617N

C37700, nearest

CW617N (CuZn40Pb2)

C3771, nearest JIS

C37700

C37700

CW617N, nearest EN

C3771, nearest JIS

Applications of Leaded Brass Hollow Rods

Leaded brass hollow rods are used in manufacturing where a component requires an internal bore, good machinability and consistent dimensions.

Common applications include:

For tube plugs and related brass items, see our brass tapered tube plugs.

Frequently Asked Questions

1. What are leaded brass hollow rods?

Leaded brass hollow rods are round or hexagonal brass bars with a bore through the centre, made from alloys that carry a few per cent of lead so they machine quickly. Turning shops use them to make bushings, sleeves, valve parts and fittings without drilling out a solid bar first.

2. Which leaded brass grade is best for machining?

C36000 and CW614N are the usual choices for fast machining, because their lead content is highest and their chips break short. Choose C36000 if your drawing follows ASTM and CW614N if it follows EN. If the part is forged before it is machined, CW617N or C37700 is the better fit.

3. What is the difference between C36000 and CW614N?

C36000 is the American free cutting brass with 60.0 to 63.0 per cent copper. CW614N is the European CuZn39Pb3 with 57.0 to 59.0 per cent copper. They behave alike on a lathe, but they are different alloys, so match the grade your drawing names and do not treat them as a straight swap.

4. Are leaded brass hollow rods RoHS compliant?

RoHS allows lead in copper alloys up to 4 per cent by weight under an exemption, and the grades here sit inside that limit. Rules change, so check the current directive and your customer requirement. We state the lead content and the standard on the certificate so your compliance team can review it.

5. Can leaded brass be used for drinking water fittings?

No. Leaded brass is not suited to parts that touch drinking water, and many regions limit lead in those parts. For potable water, specify a lead free or dezincification resistant brass and say so in your enquiry, and we will tell you what we can supply against it.

6. What sizes of brass hollow rod do you supply?

Sizes depend on the grade and the process, so we quote against your drawing. Send the outside diameter, bore or inside diameter, length and quantity with your enquiry. Hexagonal hollow rod is available on request, and cut lengths and chamfered ends can be agreed with the order.

7. Do you provide mill test certificates?

Yes. Every order ships with a mill test certificate to EN 10204 3.1, with heat chemistry and test results traceable to the lot. Third party inspection can be arranged if your purchase order asks for it. Tell us at the enquiry stage so it is planned into the delivery.

8. What is the minimum order quantity and lead time?

Minimum order quantity and lead time depend on the grade, the size and whether the size is in stock, so we confirm both in the quotation. Send your grade, size and quantity, and we will reply with a price and a delivery date that match your requirement.

Looking to Enquire or Place an Order?

Send us the grade, the size and the quantity, and tell us what the part has to do. We will come back with a price, a delivery date and an honest view on whether leaded brass is the right material for the job.

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