Inch

Metric

Standard

Tight

Extra Hard

Rockwell C52

Rockwell C55

Rockwell C60

44,000 psi

290,000 psi

295,000 psi

Case Hardened

Hardened

1"

1 1/2"

12 mm

Mirror Like

Ground

Polished

Tumbled

0.33"

0.49"

0.56"

0.65"

0.76"

0.88"

1.2"

1.25"

1.5"

2 1/2"

4 1/4"

5"

6"

6 1/16"

6 3/8"

7 1/8"

18 mm

6 mm

3/8" to 12"

1/2" to 36"

1C999

EAR99

Exempt

Compliant

Not Compliant

Compliant

Not Compliant

One Piece

Two Piece

2"

Not Rated

10-24

10-32

1/4"-20

1/4"-28

5/16"-18

5/16"-24

3/8"-16

3/8"-24

7/16"-20

1/2"-13

1/2"-20

5/8"-11

5/8"-18

1"-14

1 1/2"-6

Material Certificate with Traceable Lot Number