ASTM B139 Specification

This specification establishes the requirements for phosphor bronze rod, bar, and shapes. Units—The values stated in inch-pound units or SI units are to be regarded separately in the standard. Within the text, the SI values are given in brackets. The values stated in each system are not exact equivalents; each system of units is independent of the other. Combining values from the two systems may result in nonconformance with the specification.

Chemical Composition

Element, % Copper Alloy UNS No.
C51000 C52100 C52400 C53400 C54400
Tin 4.2-5.8 7.0-9.0 9.0-11.0 3.5-5.8 3.5-4.5
Phosphorus 0.03-0.35 0.03-0.35 0.03-0.35 0.03-0.35 0.01-0.50
Iron,max 0.10 0.10 0.10 0.10 0.10
Lead 0.05 max 0.05 max 0.05 max 0.8-1.2 3.5-4.5
Zinc 0.30 max 0.20 max 0.20 max 0.30 max 1.5-4.5
Copper remainder remainder remainder remainder remainder

Mechanical Properties for Rod and Bar, inch-pound

Temper Designation Diameter or Distance Between Parallel Surfaces,A in. Tensile Strength, ksi Elongation in 43 Diameter or Thickness of Specimen, min, %B
Code Name min max
Copper Alloy UNS No. C51000
060 soft anneal rod: round under 1⁄4 40 58 ...
H04 hard rod: round under 1⁄4 80 128 ...
round and hexagonal:
1/4 to1⁄2 , incl 70 ... 13
over 1⁄2 to 1, incl 60 ... 15
over 1 55 ... 18
bar: square and rectangular:
1⁄4 to 3⁄8 ,incl 60 ... 10
over 3⁄8 55 ... 15
H08 spring rod: round:
0.026 to1⁄16 ,incl 115 ... ...
over 1⁄16 to 1⁄8 , incl 110 ... ...
over 1⁄8 to 1/4 , incl 105 ... 3.5
over 1/4 to 3/8 ,incl 100 ... 5.0
    over 3/8 to1/2 ,incl 90 ... 9.0
Copper Alloy UNS No. C52100
060 soft anneal rod: round under 1⁄4 53 68 ...
H04 hard rod: round under 1⁄4 105 150 ...
round and hexagonal:
1⁄4 to 1⁄2, incl 85 ... 12
over 1⁄2 to 1, incl 75 ... 15
over 1 60 ... 20
    bar: square and rectangular:      
    1⁄4 to 3⁄8 , incl 68 ... 10
    over 3⁄8 60 ... 15
Copper Alloy UNS No. C52400
060 soft anneal rod: round under 1⁄4 60 75 ...
H04 hard rod: round under 1⁄4 105 160 ...
round and hexagonal:
1⁄4 to 1⁄2 , incl 95 ... 10
over 1⁄2 to 1,incl 85 ... 12
over 1 70 ... 15
    bar: square and rectangular:      
    1⁄4 to 3⁄8 , incl 76 ... 10
    over 3⁄8 70 ... 15
Copper Alloy UNS Nos. C53400 and C54400
H04 hard     rod: round and hexagonal:      
    1⁄16 to1⁄4 ,incl 65 ... 8
    over 1/4 to1⁄2 incl 60 ... 10
    over 1⁄2 to 1, incl 55 ... 12
    over 1 50   15
  bar:square and rectangular:
  1/4 to 3⁄8 ,incl 55 ... 10
  over 3⁄8 50 ... 15
Note:

A. For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
B. In any case, a minimum gage length of 1 in. shall be used.

Mechanical Properties for Rod and Bar, SI

Temper Designation Diameter or Distance Between Parallel Surfaces,A in. Tensile Strength, MPa Elongation in 43 Diameter or Thickness of Specimen, min, %B
Code Name min max
Copper Alloy UNS No. C51000
060 soft anneal rod: round under 6 275 400 ...
H04 hard rod: round under 6 550 880 ...
round and hexagonal:
6 to 12incl 485 ... 13
12 to 25 incl 415 ... 15
over 25 380 ... 18
bar: cquaro and roctangular:
6 to 9 incl 415 ... 10
over 9 380 ... 15
HOB spring rod:round:
0.065 to 1.6 incl 790 ... ...
over 1.6 to 3incl 760 ... ...
over 3 to 6incl 725 ... 3.5
over 6 to 9incl 690 ... 5.0
over 9 to 12 incl 620 ... 9.0
Copper Alloy UNS No. C52100
060 soft anneal rod: round under 6 365 470 ...
H04 hard rod: round under 6 round and hexagonal: 720 1030 ...
6 to 12 incl 585 ... 12
over 12 to 25 incl 515 ... 15
over 25 415 ... 20
    bar: square and rectangular:      
    6 to 9 incl 470 ... 10
    over 9 415 ... 15
Copper Alloy UNS No. C52400
060 soft anneal rod: round under 6 415 515 ...
H04 hard rod: round under 6 725 1100 ...
round and hexagonal: 10
6 to 12incl 655 ... 12
over 12 to 25incl 585 ... 15
over 25 480 ... ...
    bar: square and rectangular:      
    6 to 9 incl 525 ... 10
    over 9 480 ... 15
Copper Alloy UNS Nos. C53400 and C54400
H04 hard     rod: round and hexagonal:      
    1.6 to 6 incl 450 ... 8
    over 6 to 12 incl 415 ... 10
    over 12 to 25 incl 380 ... 12
    over 25 345 ... 15
  bar: square and rectangular:  
  6 to 9 incl 380 ... 10
  over 9 345 ... 15
Note:

A. For rectangular bar, the Distance Between Parallel Surfaces refers to thickness.
B. In any case, a minimum gage length of 25mm shall be used.