Bearings

Brass Balls

Brass balls show fairish mechanical performance, good corrosion resitance, excellent electrical properties. They generate low frictions. Balls are provided in the passivated condition.

Applications
Special valves, industrial pumps and valves, electronic devices, safety switches, heating units, appliances, furniture rails. They are used in the automotive, electronic and petrolchemical industry.

Chemical composition

Type	%Cu	%Zn	%Pb	%Fe	-	-	-	-	-	-	-
C26000	68.50-71.50	balance	0.070 max	0.050 max	-	-	-	-	-	-	-
C27000	63.00-68.50	balance	0.090 max	0.070 max	-	-	-	-	-	-	-
C28000	59.00-63.00	balance	0.090 max	0.070 max	-	-	-	-	-	-	-

International standards

ITA	USA	GER	FRA	UK	RUS	CHN	JAP
P-CuZn30	C26000	2.0265	CuZn30	CZ106	L70	H70	C2600
P-CuZn35	C27000	2.0335	CuZn36	CZ107	L63	H65	C2700
P-CuZn40	C28000	2.0360	CuZn40	CZ109	L60	H62	C2800

Physical / mechanical / thermal / electric / magnetic properties

Property	Symbol	U.o.M.	Type	Notes	Values
Density	d	[g/cm3]	Physical	Room temp.	8.49
Young's modulus	E	[GPa]	Mechanical	-	110
Specific heat	c	[J/kg-K]	Thermal	Room temp.	375
Coefficient of linear thermal expansion	a	10^-6/ºC]	Thermal	(?T=0-100°C)	20.4
Thermal conductivity	?	[W/(m·K)]	Thermal	Room temp.	118.0
Electric resistivity	?	[Om10^-9]	Electric	-	63
Relative magnetic permeability	µ	-	Magnetic	Paramagnetic	1.05

Technical data

Property	Type	U.o.M.	Values	U.o.M.	Values
Hardness	Mechanical	[HRB]	75 - 87	-	-
Ultimate tensile strength	Mechanical	[MPa]	500 - 600	[psix10^3]	72 - 87
Service temperature	Thermal	[ºC]	-196 / 500	[ºF]	-320.8 / 932

Range

Diameters (min/max)	U.o.M.	Diameters (min/max)	U.o.M.	Precision Grade (ISO 3290)
0.400 - 180.000	[mm]	1/64 - 7	["]	G40-60-100-200-500-1000-2000

Corrosion Resistance
Good corrosion resistance in drinking-water, brackish water, sea-water (except at high flow rate), salt athmosferes, petroleum products, alcools. Fairish resistance with respect to acids and alkali. It does not resist in contact with hydroxides, cyanides, oxidizing acids. As a general rule, corrosion resistance decreases as zinc content increases.

Drilled Balls

Property	Description
Materials	Chrome steel, tool steel, stainless steel, tungsten carbide, brass, titanium, plastic, ceramic.
Diameters	From 0.050 mm to 60.000 mm
Processing	We perform drilling, threading and milling processes directly on the basis of the customer's drawing.
Applications	Bearings, micro-valves, micro switches, precision devices for clockwork, orthodontics, measurement instruments, precision mechanics, pens, metal detectors, applications in the automotive and medical field.
Inquiries	All inquiries are welcome.

Glass Balls

Borosilicate Glass

Glass balls with high chemical and thermal stability. They are electric insulators and they are resisting even at strong external strengths and pressure variations.

Applications
Special valves, safety valves, metering pumps. They are used in the pharmaceutical field and photographic devices.

Chemical composition

%SiO2	%Na2O	%CaO	%Al2O3	%B2O3	%K2O	%BaO	-	-	-	-	-
65.00-85.00	3.00-9.00	2.50 max	1.00-5.00	8.00-15.00	2.00 max	1.00 max	-	-	-	-	-

Physical / mechanical / thermal / electric / magnetic properties

Property	Symbol	U.o.M.	Type	Notes	Values
Density	d	[g/cm3]	Physical	Room temp.	2.23
Young's modulus	E	[GPa]	Mechanical	-	64
Refractive index	n	-	Optic	-	1.471
Softening temperature	-	[ºC/ºF]	Thermal	Room temp./P.atm.	821 / 1510
Coefficient of linear thermal expansion	a	[10^-6/ºC]	Thermal	(?T=0-100°C)	3.30
Thermal conductivity	?	[W/(m·K)]	Thermal	Room temp.	1.15
Volume resistivity	?	[O*m]	Electric	-	> 10^15
Relative magnetic permeability	µ	-	Magnetic	Diamagnetic	<~1

Technical data

Property	Type	U.o.M.	Values	U.o.M.	Values
Hardness	Mechanical	[Knoop]	420 - 520	-	-
Ultimate compressive strength	Mechanical	[MPa]	1900 - 2100	[psix10^3]	275 - 305
Service temperature	Thermal	[ºC]	0 / 200	[ºF]	32 / 392

Range

Diameters (min/max)	U.o.M.	Diameters (min/max)	U.o.M.	Precision Grade
1.000 - 100.000	[mm]	3/64 - 4	["]	G28-40-100-200-500-1000-2000

Corrosion Resistance
Borosilicate balls have excellent corrosion resistance into water, most acid compounds, salt solutions, organic solvents and halogens. They are useful to resist in strong oxidizing environments. Fairish resistance to alkaline solutions, tehy do not resist to strong alkaline solutions, hydrofluoric acid and hot concentrated phosphoric acid.

Soda Lime Glass

Light weight glass balls, they are chemically inert and they allow to get excellent surface finishing.

Applications
Special bearings and valves, plastic bearings, low-cost check valves, metering pumps, flow meters, measurement instruments, agitators, optic fiber devices, ink cartridges, closures for bottle, shot blasting, grinding. They are used even into art and decoration fields.

Chemical composition

%SiO2	%Na2O	%CaO	%MgO	%Al2O3	%Li2O	%K2O	%TiO2	%Fe2O3	% PbO	-	-
63.00-81.00	9.00-15.00	7.00-14.00	6.00 max	2.00 max	2.00 max	1.50 max	0.80 max	0.80 max	0.010 max	-	-

Physical / mechanical / thermal / electric / magnetic properties

Property	Symbol	U.o.M.	Type	Notes	Values
Density	d	[g/cm3]	Physical	Room temp.	2.50
Young's modulus	E	[GPa]	Mechanical	-	70
Refractive index	n	-	Optic	-	1.518
Softening temperature	-	[ºC/ºF]	Thermal	Room temp./P.atm.	726 / 1340
Coefficient of linear thermal expansion	a	[10^-6/ºC]	Thermal	(?T=0-100°C)	9.4
Thermal conductivity	?	[W/(m·K)]	Thermal	Room temp.	1.00
Volume resistivity	?	[O*m]	Electric	-	> 10^14
Relative magnetic permeability	µ	-	Magnetic	Diamagnetic	<~1

Technical data

Property	Type	U.o.M.	Values	U.o.M.	Values
Hardness	Mechanical	[Knoop]	465 - 585	-	-
Ultimate compressive strength	Mechanical	[MPa]	900 - 1100	[psix10^3]	131 - 159
Service temperature	Thermal	[ºC]	0 / 200	[ºF]	32 / 392

Range

Diameters (min/max)	U.o.M.	Diameters (min/max)	U.o.M.	Precision Grade
1.000 - 100.000	[mm]	3/64 - 4	["]	G28-40-100-200-500-1000-2000

Corrosion Resistance
Basically inert material, soda lime balls resist even to strong alkaline solutions.