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GM D321

3rd Edition, February 2011

Complete Document

Metric Oval 90° Countersunk Head Type 1A Cross Recess Tapping Screws Types D, F and T

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
GM6039M
GM6102M
GM6170M

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 90º Countersunk Head Type IA Cross Recess Tapping Screws of thread cutting Types D, F and T conforms in all essentials with the American National Standard covering metric tapping screws. It should be noted that, for most screw sizes, the head diameters specified herein differ from those documented on previously issued detail drawings. Therefore, it is recommended that any countersink provisions in existing designs, based on earlier metric oval head screw dimensions, be reviewed and adjusted accordingly. Also, for the most part, the Type 1A cross recess configuration will serve to identify these screws as being metric.