Keep exact conversions separate from trade sizes

These values are mathematical conversions; the acceptable finished width range must be confirmed for the specific project.

3/8 in
Exact metric conversion: 9.525 mm
Project detail: ____________________
Project confirmation: State whether exact conversion or nominal 10 mm controls

1/2 in
Exact metric conversion: 12.7 mm
Project detail: ____________________
Project confirmation: Record the project width range and slot size

3/4 in
Exact metric conversion: 19.05 mm
Project detail: ____________________
Project confirmation: Do not assume nominal 20 mm is interchangeable

1 in
Exact metric conversion: 25.4 mm
Project detail: ____________________
Project confirmation: Keep one controlling unit on inspection records

1 1/2 in
Exact metric conversion: 38.1 mm
Project detail: ____________________
Project confirmation: Confirm exact conversion versus nominal 38 mm

2 in
Exact metric conversion: 50.8 mm
Project detail: ____________________
Project confirmation: Check proposed tape in the actual hardware

One inch equals exactly 25.4 mm. A rounded or nearby commercial label does not by itself establish interchangeability or acceptance tolerance.

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