S-2 Rockbit Balls

S2 Rockbit Balls

S-2 Tool Steel balls are designed to achieve extreme ruggedness. The ball surface has a smooth ground and polished finish. These balls provide the toughness and strength necessary for severe shock loads.  S-2 Tool Steel balls are hardened throughout and have unusually good wear characteristics.

S-2 Tool Steel balls find most frequent use in oil field equipment and offshore drilling operations.  They provide good service in withstanding the abrasion of pulverized rock and mud slurries.

Click Here for Ball Terms and Definitions (Grades Available and Tolerances)

 



Rockbit Balls
Balls per Pkg Stock # Grade # Diameter  Price/Pkg Order
100 KB-1802 200 0.187 $7.60 Order
100 KB-1803 200 0.250  $14.12 Order
100 KB-1804 200 0.312  $21.72 Order
50 KB-1805 200 0.437  $24.00 Order
50 KB-1806 200 0.500  $29.20 Order
50 KB-1807 200 0.562  $38.52 Order
20 KB-1818 200 0.687  $24.00 Order
20 KB-1809 200 0.750  $33.00 Order
20 KB-1800 200 0.812  $44.00 Order
10 KB-1811 200 0.875  $26.76 Order
10 KB-1835 200 0.937  $30.96 Order
10 KB-1814 200 1.00  $37.84 Order
 

Balls per Pound

Size

Balls per Pound

Inches

Millimeters

3/16

4.762

1,020

7/32

5.556

645

1/4

6.350

432

9/32

7.143

303

5/16

7.937

221

11/32

8.731

166

3/8

9.525

128

13/32

10.318

101

7/16

11.112

80.6

15/32

11.906

65.5

1/2

12.700

54.0

17/32

13.493

445.0

9/16

14.287

37.9

5/8

15.875

27.6

11/16

17.462

20.8

3/4

19.050

16.0

13/16

20.637

12.6

7/8

22.225

10.1

1

25.400

6.75

1 1/8

28.575

4.74

1 1/4

31.750

3.46

1 1/2

38.100

2.00

* Upon special request only.

Material Analysis:

S-2 Tool Steel (Rockbit) balls are manufactured to the following chemical analysis:

Material

AISI

Federal

Military

ASTM

UNS

AMS

Military and
Gov't Stds.

S-2 Tool Steel

S-2

QQ-T-570

-

A681

T-4190

-

-

Chemical Analysis

Carbon................................................................

0.47% to 0.55%

Manganese.........................................................

0.30% to 0.50%

Silicon..................................................................

0.90% to 1.10%

Molybdenum........................................................

0.30% to 0.60%

Phosphorus.........................................................

0.030% maximum

Sulpher.................................................................

0.030% maximum

Vanadium............................................................

0.5% maximum

Mechanical Properties
Hardness as measured on parallel flat surfaces is Rockwell “C” 55-58.  Ball of special hardness are available upon request.

Tensile strength...................................................

310,000 psi

Yield strength.......................................................

290,000 psi

Elongation in two inches....................................

7%

Reduction in area................................................

25%

Modulus of elasticity...........................................

30,000,000 psi

Density.................................................................

0.283 lbs./cu. in

© copyright 2005 Hoover Precision Products, Inc., All Rights Reserved