DOT Advisory: Aluminum Alloy 6351-T6

How to read Aluminum or Steel Cylinder Markings

Steel Aluminum Markings

1. Cylinder Specification consisting of three sections:

2. 12345 – Cylinder serial number (See Note A)

3. Gas Inc. – Identifying symbol (See Note A)

4. Manufacturing Data:

5. YY – Manufacturer’s identifying symbol.

6. Retest Markings:

7. Neck ring owner’s identification.

Notes:

DOT “E” Number Look-up site.

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