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Hex countersunk half/partially threaded ?

Hex countersunk half/partially threaded ?

Hex countersunk half/partially threaded ?

Hello (rookie question)
Hex socket flat countersunk head screws 8.8,
  • ISO 10642=hex countersunk
  • DIN 7991=hex countersunk
- What was the ISO, DIN, or such... to indicate "half/partially threaded" ?
so that it is not fully threaded.
- How to also indicate what ISO, DIN ?:
  1. Regular Zinc plated Zn 8.8
  2. High strength 10.2<
  3. Stainless A2
  4. Stainless A4

RE: Hex countersunk half/partially threaded ?

DIN 7991 has been replaced by ISO 19642 and the standard only refers to carbon steel fixings. For plating ISO 4042 applies. The thread length is directly related to the overall fixing length so full threading does not comply to the standard if the bolt is above a certain length, (related to the diameter). The call up is as in the attached photo.
I hope this helps a bit.

RE: Hex countersunk half/partially threaded ?

For standard parts the shorter length parts will be threaded within 3 pitches of the head for flat heads. For an M6, lengths greater than 35mm will be partially threaded, for M12 the length is greater than 60mm where they become partially threaded. If you want partial threads for shorter length parts, then the part will become a special and will require a manufacturing run.

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