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Features of Beryllium Copper

(9) Properties and Diameter Tolerance (Rod)

Properties of Rod

Alloy Temper Designation 1) Diameter/ Width across flats (mm) Tensile test 2) Hardness test 3) Electrical conductivity (%IACS) 5) Heat treatment
Tensile strength (N/mm2) Elongation (%) Vickers 4)
HV
Rockwell
HRB HRC
25 Before age hardening
O C1720B-O from 1 up to 6 410 - 590 - 90 - 190 - - min. 17 -
over 6 up to 35 410 - 590 - 90 - 190 45 - 85 - min. 17 -
H C1720B-H from 1 up to 6 645 - 900 - 180 - 300 - - min. 15 -
over 6 up to 35 590 - 900 - 175 - 330 88 - 103 - min. 15 -
After age hardening
OT C1720B-OT from 1 up to 6 1100 - 1380 - 300 - 400 - - min. 22 315°Cx3h
over 6 up to 35 1100 - 1380 - 300 - 400 - 34 - 40 min. 22 315°Cx3h
HT C1720B-HT from 1 up to 6 1270 - 1650 - 340 - 440 - - min. 22 315°Cx2h
over 6 up to 35 1210 - 1620 - 330 - 430 - 37 - 45 min. 22 315°Cx3h 6)
11 Before age hardening
H BeCuB11-H from 1 up to 6 490 - 635 - 130 - 190 - - min. 30 -
After age hardening
HT BeCuB11-HT from 1 up to 6 760 - 965 - 230 - 280 - - min. 50 450°Cx2h

1) B in column "Designation" represents "bar" or "rod"
2), 3) If hardness specification is designated, tensile test will not be applied.
4), 5) Vickers hardness and electrical conductivity are for design guidance only.
6) If the diameter or width across flats is not exceeding 19mm, the conditions shall be

Rod: Range of Standard Production

Rod:Range of Standard Production
Rod:Range of Standard Production
Diameter/Thickness max. 200 mm
Width max. 300 mm

Diameter Tolerance of Rod(mm)

Rod
Specified Diameter Tolerance
Over Up to and including
from 1.0 2.5 ±0.02
2.5 3.5 ±0.02
3.5 5 ±0.02
5 10 ±0.03
10 20 ±0.08
20 35 ±0.10
35 40 ±0.12

note) When the tolerance is specified either plus or minus side only, the same range of tolerance shall be applied.

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