9.91mm 0.390inch AISI304 Stainless Steel Balls for Computer Hard Drive 3.968g

Creation Description

They exhibit great mechanical traits, toughness and corrosion resistance. AISI 304L gives lower carbon articles, AISI 302 better mechanical traits. Balls are presented in the passivated problem.


Stainless steel balls are commonly utilised in bearings, automobiles, bikes, bicycles, house appliances, chemical machinery, textile machinery, food equipment, mining equipment, devices, and other fields.

Chemical composition 

Sort %C %Si %Mn %P %S %Cr %Ni %N
302 .one hundred fifty max 1.00 max 2.00 max .045 max .030 max 17.00-19.00 eight.00-ten.00 .one hundred max
304 .080 max .75 max two.00 max .045 max .030 max 18.00-20.00 8.00-10.fifty .one hundred max
304L .030 max .75 max 2.00 max .045 max .030 max 18.00-twenty.00 8.00-10.50 .a hundred max

CZPT standards 

ITA Usa GER FRA British isles RUS CHN JAP
X10CrNi18-eight 302 one.4310 Z11CN18-08 301S21 12KH18N9 1Cr18Ni9 SUS301
X5CrNi18-10 304 1.4301 Z7CN18-09 304S15 08KH18N10 0Cr18Ni9 SUS304
X2CrNi18-nine 304L one.4307 Z3CN18-ten 304S11 04KH18N10 00Cr19Ni10 SUS304L

Physical / mechanical / thermal / electric powered / magnetic properties 

Residence Symbol U.o.M. Sort Notes Values
Density δ [g/cm3] Actual physical Place temp. seven.ninety five
Young’s modulus E [GPa] Mechanical 200
Specific warmth c [J/kg-K] Thermal Room temp. five hundred
Coefficient of linear thermal expansion α [ten^-six/ºC] Thermal (ΔT=-100°C) seventeen.five
Thermal conductivity λ [W/(m·K)] Thermal Room temp. 15.8
CZPT resistivity ρ [Ω*m*ten^-nine] CZPT 710
Relative magnetic permeability µ Magnetic Paramagnetic one.571*

CZPT data 

House Type U.o.M. Values U.o.M. Values
Hardness Mechanical [HRC] 20 – 39 (1)* [HV] one hundred – 250 (two)*
Final tensile energy Mechanical [MPa] five hundred – 1300 [psix10^three] 72 – 188
Support temperature Thermal [ºC] -196 / seven hundred [ºF] -320.eight / 1697

Corrosion Resistance 
Really excellent corrosion resistance with regard to organic and natural substances, oxidating options, foodstuff, sterilizing options. Good resistance with respect to atmospheric corrosion and dyes. They are subjected to pitting and crevice corrosion in existence of sizzling chloride solutions and to anxiety corrosion when temperature exceeds 60°C. They do not resist to sulfuric acid solutions. AISI 302 shows slightly ideal corrosion resistance with respect to AISI 304/304L stainless steels.


Property  Description
Hardness* Balls can be supplied in the (one) Cold Worked (HRC twenty-39, normal product) or (2) ANNEALED (HV a hundred-250, on demand) situations.
Magnetism Eventual magnetism of AISI 316 balls and in general of all austenitc stainless steels strictly depends by the manufacturing procedure, specific inquiries for not magnetic balls should priorly noted.
Precision Quality** On specifical request and for massive quantities, we can offer G10 and G16 precision quality balls. Diameters from 3.000 mm to one/2″.
Precision Grade** On specifical ask for we can supply G20-24-twenty five-28-40-forty eight-fifty-sixty-eighty precision quality balls.

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Packing&Shipping and delivery

Manufacturing Approach

Company Data

ZheJiang Jinnai CZPT Trade Co.,Ltd. is a single of the professional manufactures which specialize in the steel ball,like carbon

metal balls,stainless steel balls ,bearing chrome steel balls ,hollow metal balls ,iron balls ,magnetic buckyballs ,ball connected merchandise

this sort of as ball cage or ball retainers, silicone balls ,plastic balls .ect…



Q:Do you provide samples just before get? is it free or added ?
A: Yes, we could offer the sample ,But extra.or we can go over
Q:Can you do CZPT design and style ?
A: Of course,we can do customizes design,you just give us your layout,photograph,layout,dimensions and your necessary.
Q:What is your terms of payment ?
A: Payment: 30% T/T in progress ,equilibrium ahead of cargo.

9.91mm 0.390inch AISI304 Stainless Steel Balls for Computer Hard Drive 3.968g