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  1. usa_faggot

    B18.2.1 bolt designation

    Hello, may somebody help how designate hex bolt. Our previous designation of hex bolt was Bolt B1821 AH 025 C 100 N, but now I read a standard ASME B18.2.1-2010 and foundd a fact, that bolt must designated as Square Bolt per ASME B18.2.1, 3⁄8 – 16 11⁄2. Steel per ASTM A 307 Grade A, Zinc plated...
  2. usa_faggot

    ASTM standards usage.

    Hi everybody! I need help to understand ASTM drawing logic. In our country, we use native draft standards which regulate how should drawing look like and what type of information it must contain. I don't understand how to define in ASTM drawings which material should be used to produce detail...
  3. usa_faggot

    PCB material

    Hi everybody. I have a question. Is there a standard for material FR-4? And does it exist a standardized designation for this material with foil thickness and etc?

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