7mm ball bearing ball made by tungsten carbide

Bearing ball

Type

Dimensions and tolerance(mm)

Diameter

Tolerance

D-0.5

0.5

±0.02

D-2.5

2.5

±0.3

D-2.7

2.7

±0.3

D-3.3

3.3

±0.3

D-4.2

4.2

±0.3

D-5.5

5.5

±0.3

D-6

6

±0.3

D-8

8

±0.3

D-10

10

±0.3

D-12

12

±0.3

D-20

20

±0.3

D-25

25

±0.5

D-30

30

±0.5

D-35

35

±0.5

D-40

40

±0.5

D-45

45

±0.5

D-50

50

±0.5

…

…

…

Grade

ISO

 Specification

 Recommend application

 Density

 TRS

 Hardness

G/Cm³

N/mm²

HRA

YG6X

K10

14.8-15.1

≥1560

≥91.0

Qualified for machining of chilled cast iron, alloy cast iron, refractory steel and alloy steel. Also Qualified for the machining of common cast iron.

YG6A

K10

14.7-15.1

≥1580

≥91.0

YG6

K20

14.7-15.1

≥1670

≥89.5

Qualified for finish machining and semi-finish machining for the cast iron, non-ferrous metal, alloy and unalloyed materials. Also qualified for wire drawing for the steel and non-ferrous metal, electric drill for geology use and steel drill etc.

YG8

K20-K30

14.6-14.9

≥1840

≥89

Qualified for rough machining of cast iron, non-ferrous metal, nonmetal materials, drawing of steel, non-ferrous metal and pipes, various drills for geology use, tools for machine manufacture and wearing parts.

YS2T

K30-M30

14.5-14.8

≥2300

≥91.5

Qualified for low speed rough machining, milling titanium alloy and refractory alloy, especially for cut-off tool and silk prick.

YL10.2

K30-M30

14.4-14.6

≥2100

≥91.5

YK25

K40

14-.3-14.6

≥2100

≥86.5

Qualified for molding the drills for heavy-duty rock drill: detachable bits used for deep hole drilling, rock drill trolley etc.

YG11C

K40

14.0--14.4

≥2060

≥86.0

YG15

K40

13.9-14.1

≥2020

≥86.5

Qualified for hard rock drilling, steel bars with high compression ratios, pipe drawing, punching tools, core cabinet of powder metallurgy automatic molders etc.

YG20

13.4-14.8

≥2480

≥83.5

Qualified for making dies with low impact such as punching watch parts, battery shells, small screw caps etc.

YG20C

13.4-14.8

≥2480

≥82.5

Qualified for making moulds of cold heading, cold stamping and cold pressing used for manufacturing standard parts, bearings etc.