DELPHI DX500019 METRIC FLAT 90 DEGREE COUNTERSUNK TRIM HEAD TYPE 1A CROSS RECESS TAPPING SCREWS TYPES AB, B, BF AND BT
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DELPHI DX500019 Document Information:
Title
METRIC FLAT 90 DEGREE COUNTERSUNK TRIM HEAD TYPE 1A CROSS RECESS TAPPING SCREWS TYPES AB, B, BF AND BT
Delphi Automotive Systems
Publication Date:
Jun 1, 1999
Scope:
1. SCOPE
This standard for Metric Flat 90° Countersunk Trim Head Type 1A Cross Recess Tapping Screws of thread forming Types AB and B and thread cutting Types BF and BT conforms in all essentials, except head proportions, 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 standard flat head diameters applicable to the next smaller screw size. It should be noted that, for the most part, the Type 1A cross recess configuration will serve to identify the screws as being metric.
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