S-2 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.

S-2 Tool Steel (Rockbit) Balls: Available Grades and Sizes
Grade	Size Range in Inches and Millimeters
50 - 200	5/32 - 1 3/4 3.968 - 38.100

Click here for sizes and pricing

Balls per Pound
Size		Balls per Pound
Inches	Millimeters	Balls per Pound
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

Rockbit Balls Click Here for Ball Terms and Definitions (Grades Available and Tolerances ) Click here to Order Online
Balls per Pkg	Stock #	Grade #	Diameter	Price/Pkg
40000	KB-1219	200	0.187	$1497.60
100	KB-1802	200	0.187	$4.73
40000	KB-1218	48	0.187	$1560.00
4350	KB-1221	200	0.250	$280.84
100	KB-1803	200	0.250	$8.62
4350	KB-1220	48	0.250	$292.41
3000	KB-1213	200	0.281	$278.64
3000	KB-1192	48	0.281	$290.16
2200	KB-1182	200	0.312	$168.43
100	KB-1804	200	0.312	$13.34
2200	KB-1211	48	0.312	$228.93
1300	KB-1184	200	0.375	$148.04
1300	KB-1183	48	0.375	$154.15
1300	KB-1186	200	0.406	$185.48
1300	KB-1185	48	0.406	$193.13
810	KB-1188	200	0.437	$134.43
810	KB-1187	48	0.437	$139.97
50	KB-1805	200	0.437	$13.50
550	KB-1201	200	0.500	$107.65
50	KB-1806	200	0.500	$16.70
550	KB-1189	48	0.500	$165.08
380	KB-1181	200	0.562	$102.40
380	KB-1191	48	0.562	$106.62
275	KB-1194	200	0.625	$124.93
50	KB-1807	200	0.562	$21.13
275	KB-1193	48	0.625	$130.08
200	KB-1196	200	0.687	$167.25
25	KB-1818	200	0.687	$18.92
200	KB-1195	48	0.687	$174.14
160	KB-1199	200	0.750	$163.47
25	KB-1809	200	0.750	$21.94
200	KB-1197	24	0.750	$198.74
160	KB-1198	48	0.750	$167.78
125	KB-552	200	0.812	$168.11
25	KB-1800	200	0.812	$28.04
125	KB-1200	48	0.812	$175.04
100	KB-1174	200	0.875	$249.43
10	KB-1811	200	0.875	$14.56
100	KB-1173	48	0.875	$259.70
10	KB-1835	200	0.937	$16.86
80	KB-1176	200	0.938	$174.68
80	KB-1175	48	0.938	$181.82
80	KB-1178	200	0.969	$193.46
80	KB-1177	48	0.969	$201.49
65	KB-1170	200	1.000	$170.30
65	KB-1149	48	1.000	$178.10
10	KB-1814	200	1.00	$19.72
40	KB-1139	200	1.125	$233.60
40	KB-1168	48	1.125	$243.20
30	KB-1141	200	1.250	$212.40
30	KB-1140	48	1.250	$220.14
25	KB-1143	200	1.375	$296.50
25	KB-1142	48	1.375	$309.00
20	KB-1145	200	1.500	$265.20
20	KB-1144	48	1.500	$276.40