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GM D144

3rd Edition, February 2011

Complete Document

Metric Oval 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:

GM4405M
GM6010M
GM6039M
GM6102M

Product Details:

  • Revision: 3rd Edition, February 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 Oval 90° Countersunk Trim Head 6-Lobed Socket Tapping Screws of thread forming Types AB and B and thread cutting Types BG and BT conforms in all essentials, except head proportions and the driving provisions, with the American National Standard covering metric tapping screws. Basically, the smaller head proportions of the trim heads were derived by applying to the respective screw diameters the 1976 standard oval head diameters applicable to the next smaller screw size, and specifying a rounded edge.