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Re: The Number of Screw thread fastener

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Posted by BJH (64.45.143.248) on November 25, 2002 at 13:04:23:

In Reply to: The Number of Screw thread fastener posted by joo on November 25, 2002 at 04:18:13:

JOO,
I'm sorry, but I do not understand exactly what you are asking.
If you are looking for a good rule of thumb for minimum length of thread engagement then...
Use 1.5 * Major Diameter of Screw

For example, if an M3 is being used, then the minimum length of engagement should be 1.5 * 3 = 4.5 mm.
Important Note: This rule of thumb is just that. It is not a perfect formula. Things to consider are 1) material (of both screw and mate), 2) installation rpm's, etc.
Good luck.

: i have a question.
: my question is how we want to determine that the amount number of thread fastener design will give a best or worst engagement? why? thank for those who help me. 10x again,

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Subject: Re: Re: The Number of Screw thread fastener

Comments:
: JOO, : I'm sorry, but I do not understand exactly what you are asking. : If you are looking for a good rule of thumb for minimum length of thread engagement then... : Use 1.5 * Major Diameter of Screw : For example, if an M3 is being used, then the minimum length of engagement should be 1.5 * 3 = 4.5 mm. : Important Note: This rule of thumb is just that. It is not a perfect formula. Things to consider are 1) material (of both screw and mate), 2) installation rpm's, etc. : Good luck. : : i have a question. : : my question is how we want to determine that the amount number of thread fastener design will give a best or worst engagement? why? thank for those who help me. 10x again,

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