INCH-POUND
FF-S-92C
28 October 2014
SUPERSEDING
FF-S-92B
27 August 1974
FEDERAL SPECIFICATION
SCREW, MACHINE, SLOTTED, CROSS-RECESSED
OR HEXAGON HEAD
The General Services Administration has authorized the use of this federal
specification by all federal agencies.
1. SCOPE AND CLASSIFICATION
1.1 Scope. This specification covers slotted, cross-recessed and hexagon head machine
screws.
1.2 Classification.
1.2.1 Type and style. Machine screws may be of the following types and styles (see 6.2).
Type I - Slotted (see figure 1).
Style 1s - Round head Style 6s - Oval head, 82°
Style 2s - Flat head, 82° Style 7s - Truss head
Style 3s - Flat head, 100° Style 8s - Binding head
Style 4s - Fillister head Style 9s - Pan head
Style 5s - Fillister head, Style 10s - Hexagon head
drilled
Type II - Hexagon, Plain (see figure 1).
Style 10p - Hexagon
Type III - Cross-Recessed, Recess Designs I and II (see figure 2).
Style 1c - Round head Style 6c - Oval head, 82°
Style 2c - Flat head, 82° Style 7c - Truss head
Style 3c - Flat head, 100° Style 8c - Binding head
Style 4c - Fillister head Style 9c - Pan head
Note: Use of cross-recess design II is not recommended.
1.2.2 Size. Machine screws shall be classified according to size by the nominal diameter of
the body.
Comments, suggestions, or questions on this document should be addressed to Defense
Supply Center Philadelphia (DSCP), ATTN: DSCP-NASA, 700 Robbins Avenue, Philadelphia,
PA 19111-5096 or e-mail to dscpg&ispecomments@dla.mil
. Since contact information can
change, you may want to verify the currency of this address information using the ASSIST
Online database at https://assist.dla.mil .
