Features of Beryllium Copper

(10) Properties and Diameter Tolerance (Wire)

Properties of Wire

Alloy	Temper	Designation 1)	Diameter (mm)	Tensile test		Electrical conductivity 2) (%IACS)	Heat treatment
				Tensile strength (N/mm2)	Elongation (%)
25	Before age hardening
	O	C1720W-O	from 0.3	390 - 540	-	-	-
	1/4H	C1720W-1/4H	from 0.1	620 - 805	-	-	-
	3/4H	C1720W-3/4H	from 0.1	835 - 1070	-	-	-
	After age hardening
	OT	C1720W-OT	from 0.3	1100 - 1380	-	min. 22	315°Cx3h
	1/4HT	C1720W-1/4HT	from 0.1	1210 - 1450	-	min. 22	315°Cx2h
	3/4HT	C1720W-3/4HT	from 0.1	1300 - 1590	-	min. 22	315°Cx1h

1) W in column "Designation" represents "Wire"
2) Electrical conductivity are for design guidance only.

Wire:Range of Standard Production

Diameter	in coil	0.2 - 1.0 mm
	on bobbin	0.05 - 0.15 mm

Diameter Tolerance of Wire(mm)

Wire
Specified Diameter		Tolerance
Over	Up to and including
from 0.1	0.25	±0.005
0.25	0.3	±0.008
0.3	0.5	±0.010
0.5	1	±0.015
1	2	±0.020
2	3.5	±0.025

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