NPFC - FF-S-107
SCREW, TAPPING AND DRIVE
| Organization: | NPFC |
| Publication Date: | 27 May 1969 |
| Status: | active |
| Page Count: | 14 |
scope:
This specification covers the requirements for tapping screws, both thread cutting and thread forming, and metallic drive screws.
Tapping and drive screws shall be of the following types, as specified (see 6.2).
Type AB - Thread forming, gimlet point. Type B - Thread forming, blunt point. Type BP - Thread forming, cone point. Type C - Thread forming, blunt point. Type D - Thread forming, blunt point. Type F - Thread forming, blunt point. Type G - Thread forming, blunt point. Type T - Thread forming, blunt point. Type BF - Thread forming, blunt point. Type BT - Thread forming, blunt point. Type U - Drive screw, pilot point.
Note: Type BG - Thread cutting, blunt point has been removed from this specification. Use type BF or BT.
Tapping and drive screws shall be ot the following head styles:
Head Slotted Recessed Plain * Flat - X - ** Flat X X - ** Undercut flat X X - ** Flat trim - X - ** Oval X X - ** Undercut oval X X - ** Oval trim - X - Pan X X - Fillister X X - Truss X X - *** Hexagon X - X *** Hexagon Washer X - X Drive Screw - - X Round X
intended Use:
Thread forming tapping screws are intended for use in material where large internal stresses are permissible or desirable to increase resistance to loosening.
Thread cutting tapping screws... View More
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