Outstanding among the super alloy high speed steel grades. Cobalt high speed steel is harder than most grades making it tougher and more durable. As a result, it is highly effective for tools requiring maximum abrasion resistence and toughness. Hardness of these tools is approximately 67-69 Rockwell. Blanks are precision ground to diameter tolerances of +.0000/-.0002”. Split tolerance is .001” above center.

A = One End Split

B = Both Ends Split

C = Full Round Blank

Size (inches)

Part No. Prefix

A = One End Split

B = Bpth Ends Split

C = Full Round Blank

1/8 × 2

901

3.05

3.95

2.15

3/16 × 3

902

4.65

6.15

3.15

1/4 × 3

903

6.25

8.50

4.00

5/16 × 3

904

10.15

13.80

6.50

3/8 × 3

905

12.00

16.25

6.95