Features of Beryllium Copper

(7) Properties and Tolerances of Midrange Material (Alloy 7)

Properties of Strip

Alloy	Temper	Designation 5)	Tensile test 1)			Hardness test 2)	Electrical conductivity 3) (%IACS)
			Tensile strength (N/mm2)	Yield strength 0.2%offset (N/mm2)	Elongation (%)	Vickers hardness HV
7	1/2HT		670 - 800 4)	550 - 760	min. 10	195 - 250	min. 38
	HT		765 - 900 4)	686 - 834	min. 8	220 - 275	min. 33
	EHT		870 - 1000 4)	750 - 930	min. 4	250 - 310	min. 30

1) Values are applicable to thickness 0.1 mm and over.
2) Values are applicable to thickness 0.1 mm and over.
3) Electrical conductivity is for design guidance only.
4) The upper limits of tensile strength are for design guidance only.
5) P and R in column "Designation" represent "strip cut to length" and "strip in coils".

Tolerances

Thickness tolerance of Alloy 7(mm)

* Standard thickness is only available for Alloy 7

Specified thickness	Tolerance
0.08	±0.006
0.10	±0.006
0.12	±0.006
0.15	±0.008
0.18	±0.010
0.20	±0.010
0.25	±0.010
0.30	±0.015
0.35	±0.015
0.40	±0.015

Length tolerance(mm)

		Tolerance
From	Up to and including	max. 1000
0.08	0.4	+10
		-0

Width tolerance(mm)

		Tolerance
		Strip cut to length	Strip in coils
From	Up to and including	max. 200	max. 100	Over 100 up to and including 200
0.08	0.40	+2 -0	±0.1	±0.2

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

Camber tolerance(mm)

Specified Width		Maximum value
Over	Up to and including	Over 1000 length
From 4	13	4
13	50	3
50	100	2
100	200	1