FF-S-92B
August 27, 1974
SUPERSEDING
FF-S-92a
January 26, 1965
FEDERAL SPECIFICATION
SCREW, MACHINE: SLOTTED, CROSS-RECESSED HEXAGON HEAD
This specification was approved by the Commissioner, Federal Supply Service,
General Services Administration, for the use of 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 shall be of the following types
and styles (see 6.2).
Type I - Slotted (see fig. 1)
Style 1s - Round head Style 6s - Oval bead, 82 deg.
Style 2s - Flat head, 82 deg. Style 7s - Truss head
Style 3s - Flat head, 100 deg. 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 fig. 1)
Style 10p - Hexagon
Type III - Cross-Recessed, Recess Designs I and 11 (see fig. 2).
Style 1c - Round head Style 6c - Oval head, 82 deg.
Style 2c - Flat head, 82 deg. Style 7c - Truss head
Style 3c - Flat head, 100 deg. Style 8c - Binding head
Style 4c - Fillister head Style 9c - Pan head
NOTE: Use of cross-recess design II is not recommended.
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