RWMA Class 3 Copper | McMaster-Carr

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RWMA Class

Shape

System of Measurement

Thickness

Width

Material

17510 Beryllium Copper

Diameter

Length

Temper Rating

Hardness Rating

Yield Strength

30,000 psi to 99,999 psi

Hardness

Rockwell B90

Rockwell B98

Certificate Type

Material Certificate with Traceable Lot Number

Tolerance Rating

Standard

Thermal Conductivity @ Temperature

127 BTU⋅in/(hr⋅ft²⋅°F) @ 68° F

145 BTU/(hr⋅ft⋅°F) @ 68° F

Fabrication

Cold Worked

Melting Point Temperature

1,590° F

1,955° F

Appearance

Plain

Modulus of Elasticity

Heat Treatable

Density

REACH

Export Control Classification Number (ECCN)

EAR99

Elongation

10%

RoHS

Compliant

DFARS Specialty Metals

Exempt

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26 Products

About Copper, Brass & Bronze

Compare over 30 copper, brass, and bronze alloys to find the right material for you—all with material certificates for traceability.

Extra High-Strength Beryllium-Free 180 Copper Bars

Yield Strength: 90,000 psi
Hardness: Rockwell B90 (Medium)
Temper: Not Rated
Heat Treatable: Yes
Specifications Met: RWMA Class 3

These copper bars have similar performance properties to beryllium copper, but do not require special machining techniques. They’re often used for high-stress applications such as studs, welding electrodes, mold cavities, and electrical components. Even after collisions and frequent use, they maintain their shape. They conduct electricity, but not as well as purer copper, such as 101 copper. Using them in extreme temperatures won’t change their mechanical properties, but you can process them with heat treatment if you wish to alter their properties. They’re RMWA Class 3, which is a class that’s commonly used to seam and spot weld stainless steel and other electrically-resistant materials. When used outdoors, these bars won’t rust.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

1/2" Thick. (-0.006" to 0.006" Tolerance)
Width	Straightness Tolerance		1 ft. Lg.	3 ft. Lg.	6 ft. Lg.
1"	1/2" per 3 ft.	0000000	000000	0000000	0000000
3/4" Thick. (-0.006" to 0.006" Tolerance)
3/4"	1/2" per 3 ft.	0000000	000000	000000	000000
1"	1/2" per 3 ft.	0000000	000000	000000	000000
2"	1/2" per 3 ft.	0000000	000000	000000	000000
1" Thick. (-0.006" to 0.006" Tolerance)
2"	1/2" per 3 ft.	0000000	000000	000000	00
1 1/2" Thick. (-0.006" to 0.006" Tolerance)
1 1/2"	1/2" per 3 ft.	0000000	000000	000000	00
2" Thick. (-0.006" to 0.006" Tolerance)
2"	1/2" per 3 ft.	0000000	000000	00000000	00

Extra High-Strength Beryllium-Free 180 Copper Rods

Yield Strength: 90,000 psi
Hardness: Rockwell B90 (Medium)
Temper: Not Rated
Heat Treatable: Yes
Specifications Met: RWMA Class 3

Even though they have similar performance properties to beryllium copper, these copper rods don't require special machining techniques. They’re used for high-stress applications such as studs, welding electrodes, mold cavities, and electrical components because they hold their shape through collisions and frequent use. They conduct electricity, but not as well as 101 copper and other purer coppers. Their mechanical properties won’t change when used in extreme temperatures, but you can heat treat them if you want to alter their properties. Meeting RMWA Class 3, they’re often used to seam and spot weld electrically-resistant materials such as stainless steel. These rods won’t rust if used outdoors.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Diameter	Diameter Tolerance	Straightness Tolerance		1 ft. Lg.	3 ft. Lg.
1/2"	-0.005" to 0.005"	1/2" per 3 ft.	0000000	000000	000000
5/8"	-0.005" to 0.005"	1/2" per 3 ft.	0000000	00000	000000
3/4"	-0.005" to 0.005"	1/2" per 3 ft.	0000000	00000	000000
1"	-0.005" to 0.005"	1/2" per 3 ft.	0000000	000000	000000
1 1/4"	-0.005" to 0.005"	1/2" per 3 ft.	0000000	000000	000000
1 1/2"	-0.005" to 0.005"	1/2" per 3 ft.	0000000	000000	000000
2"	-0.005" to 0.005"	1/2" per 3 ft.	0000000	000000	000000
3"	-0.005" to 0.005"	1/2" per 3 ft.	0000000	000000	00000000

Super-Conductive Extra High-Strength 17510 Beryllium Copper Bars

Yield Strength: 90,000psi
Hardness: Rockwell B98 (Medium)
Temper: TH04
Heat Treatable: Yes
Specifications Met: RWMA Class 3

In addition to being conductive, these 17510 beryllium copper bars are non-sparking and non-magnetic, so they’re used in mines and oil rigs, as well as for navigational tools. The beryllium and nickel in this alloy make it stronger and more rigid than pure copper, but not as conductive. These bars are conductive enough for electrical relays, probe pins, and test-socket and modular-jack contacts, while being strong enough for welding dies, plunger tips, and injection-mold nozzles. Even after collisions and frequent use, they maintain their shape, so they’re used for molds and cavities. Meeting RWMA Class 3, they’re recommended when seam and spot welding electrically-resistant material, such as stainless steel. They also withstand extreme temperatures and won’t rust outdoors.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

1/2" Thick. (-0.005" to 0.005" Tolerance)
Width	Temper Rating	Straightness Tolerance		1 ft. Lg.	3 ft. Lg.	6 ft. Lg.
1"	Hard	1/2" per 3 ft.	0000000	0000000	0000000	0000000
1 1/2"	Hard	1/2" per 3 ft.	0000000	000000	000000	000000
3/4" Thick. (-0.005" to 0.005" Tolerance)
3/4"	Hard	1/2" per 3 ft.	0000000	000000	000000	00
1"	Hard	1/2" per 3 ft.	0000000	000000	000000	00
1" Thick. (-0.006" to 0.006" Tolerance)
1"	Hard	1/2" per 3 ft.	0000000	000000	000000	00
1 1/4" Thick. (-0.006" to 0.006" Tolerance)
1 1/4"	Hard	1/2" per 3 ft.	0000000	000000	000000	00

Super-Conductive Extra High-Strength 17510 Beryllium Copper Rods

Yield Strength: 90,000psi
Hardness: Rockwell B98 (Medium)
Temper: TH04 (Hard)
Heat Treatable: Yes
Specifications Met: RWMA Class 3

These 17510 beryllium copper rods are not only conductive, but also non-sparking and non-magnetic, making them suitable for mines, oil rigs, and navigational tools. Containing beryllium and nickel, this alloy is stronger and more rigid than pure copper, though not as conductive. These rods are conductive enough for electrical relays, probe pins, and test-socket and modular-jack contacts, as well as strong enough for welding dies, plunger tips, and injection-mold nozzles. They maintain their shape despite collisions and frequent use, so they’re good for molds and cavities. Meeting RWMA Class 3, they’re recommended when seam and spot welding stainless steel and other electrically-resistant material. They also resist extreme temperatures and won’t rust outdoors.

Certificates with a traceable lot number are available for these products. Download certificates from ORDER HISTORY after your order ships.

Diameter	Diameter Tolerance	Straightness Tolerance		1 ft. Lg.	3 ft. Lg.	6 ft. Lg.
1/2"	-0.003" to 0.003"	1/2" per 3 ft.	0000000	000000	0000000	0000000
3/4"	-0.003" to 0.003"	1/2" per 3 ft.	0000000	00000	000000	000000
1"	-0.003" to 0.003"	1/2" per 3 ft.	0000000	000000	000000	000000
1 1/2"	-0.004" to 0.004"	1/2" per 3 ft.	0000000	000000	000000	00
2"	-0.004" to 0.004"	1/2" per 3 ft.	0000000	000000	00000000	00