Inch

Metric

Acme Class 2G

Metric Class 6H

Unified Standard Class 2B

Unified Standard Class 3B

Acme

Metric

UNC

UNEF

UNF

UNS

Go

No-Go

Aluminum

Stainless Steel

Steel

X

Z

Accuracy Certificate Traceable to NIST

Calibration Certificate Traceable to NIST

Material Certificate with Traceable Lot Number

EAR99

Compliant

Compliant with Exemptions

Not Compliant

Compliant

Not Compliant

Rockwell C60

Rockwell C70

Exempt

0.35 mm

0.4 mm

0.45 mm

0.5 mm

0.6 mm

0.7 mm

0.75 mm

0.8 mm

1 mm

1.25 mm

1.5 mm

1.75 mm

2 mm

2.5 mm

3 mm

3.5 mm

4 mm

5 1/4"

5 15/32"

5 1/2"

6 1/8"

6 19/32"

6 3/4"

7 3/16"

7 1/4"

7 1/2"

7 17/32"

7 21/32"

7 3/4"

8 1/4"

Made-to-Order

1"

2"

3"

4"

6"

0.0001"

0.0005"

0.001 mm

0.01 mm

1 1/2"

1 3/4"

2"

2 3/4"

3"

3 1/4"

3 5/8"

4"

4 3/8"

5 3/8"

5 1/2"

5 3/4"

5 7/8"

6"

6 1/8"

8"

ASME Standard

NAS