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GM C121

3rd Edition, May 1, 2011

Complete Document

Metric Oval 90 Degree Countersunk Head Type 1A Cross Recess Machine Screws

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


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ENGLISH * INACTIVE FOR NEW DESIGN
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Referenced Items:

ASME B1.13M
GM C200
GM C201
GM C230

Product Details:

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

Description / Abstract:

This standard for Metric Oval 90┬░ Countersunk Head Type 1A Cross Recess Machine Screws conforms in all essentials with the American National Standard covering metric machine screws. It should be noted that, for most screw sizes, the head diameters specified herein differ from those documented in prior issues. Therefore, it is recommended that any countersink provisions in existing designs based on former metric oval head screw standards be reviewed and adjusted accordingly. In general, screws made in conformance with this standard are considered to be functionally interchangeable with parts produced to the latest IS0 Standard for recessed raised countersunk head screws. Also, for the most part, the Type 1A cross recess configuration will serve to identify these screws as being metric.