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GM D143

3rd Edition, February 1, 2011

Complete Document

Metric Flat 90° Countersunk Trim Head 6-Lobed Socket Tapping Screws Types AB, B, BF, and BT

Includes all amendments and changes through Inactive for New Design Notice 4, February 2011


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Additional Comments:
ENGLISH * INACTIVE FOR NEW DESIGN
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Referenced Items:

GM D200
GM4405M
GM6010M
GM6039M

Product Details:

  • Revision: 3rd Edition, February 1, 2011
  • Published Date: February 2011
  • Status: Not Active, See comments below
  • Document Language: English
  • Published By: General Motors Company (GMNA)
  • Page Count: 4
  • ANSI Approved: No
  • DoD Adopted: No

Description / Abstract:

GENERAL

This standard for Metric Flat 90° countersunk Head 6-Lobed Socket Tapping Screws of thread forming Types AB and B and thread cutting Types BF and BT conforms in all essentials, except driving provisions, with the American National Standard covering metric tapping screws. Basically, the smaller heads proportions of the trim heads were derived by applying to the respective screw diameters the standard flat head diameters the standard flat head diameters applicable to the next smaller screw size.