Inch

Metric

Acme Class 2G

Metric Class 6H

Unified Standard Class 2B

Unified Standard Class 3B

Acme

Metric

UNC

UNEF

UNF

Go

No-Go

Aluminum

Stainless Steel

Steel

Accuracy Certificate Traceable to NIST

Calibration Certificate Traceable to NIST

Material Certificate with Traceable Lot Number

X

Z

EAR99

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

Compliant

Compliant with Exemptions

Not Compliant

Compliant

Not Compliant

Rockwell C60

Rockwell C70

Exempt

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