C651 Silicon Bronze (CuSi1)

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Overview

Alloy C651 is a corrosion resistant copper alloy. It is primarily used as a welding rod and for mechanical fasteners and electrical connections.

Physical Properties

Round Wire

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed O61 38.0 55.0 .0010 - .1285 inch
1/4 Hard H01 60.0 75.0
1/2 Hard H02 75.0 95.0
Hard H04 90.0 110
Spring H08 100  
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed O61 260 380 .0254 - 3.264 mm
1/4 Hard H01 410 520
1/2 Hard H02 510 660
Hard H04 620 760
Spring H08 680  

Square Wire

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed O61 38.0 55.0 .0100 - .0808 inch 
1/4 Hard H01 60.0 75.0
1/2 Hard H02 75.0 95.0
Hard H04 90.0 110
Spring H08 100  
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed O61 260 380 .2540 - 1.905 mm
1/4 Hard H01 410 520
1/2 Hard H02 510 660
Hard H04 620 760
Spring H08 680  

Rolled Flat

TEMPER NAME TEMPER CODE TENSILE
STRENGTH (ksi)
MILL LIMITS
(inch)
Min Max
Annealed O50 40.0 50.0 Thickness:
.0100 - .0500 inch

Width:
.0150 - .2500 inch
1/4 Hard H01 42.0 52.0
1/2 Hard H02 47.0 57.0
Hard H04 60.0 70.0
Extra Hard H06 67.0 76.0
Spring H08 71.0 79.0
TEMPER NAME TEMPER CODE TENSILE
STRENGTH (Mpa)
MILL LIMITS
(mm)
Min Max
Annealed O50 270 350 Thickness:
.2540 - 1.905 mm

Width:
.3810 - 6.350 mm
1/4 Hard H01 280 360
1/2 Hard H02 320 400
Hard H04 410 490
Extra Hard H06 460 530
Spring H08 480 550

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