FF-S-86F
January 7, 2020
SUPERSEDING
FF-S-86E
May 29, 1987
FEDERAL SPECIFICATION
SCREW, CAP, SOCKET-HEAD
This specification is 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 socket-head cap screws with multiple head
configurations utilizing alloy steels (Grades 4137, 4140, 4142, 4145, 4340, 8740 and
5137M), corrosion-resistant steels (types 302, 304, 304L, 305, 316, 316L and 384),
heat and corrosion-resistant steel A286, non-ferrous materials including nickel-copper
alloy, nickel-copper-aluminum alloy, Inconel 625 or 686, or titanium, with cadmium
plating, zinc plating, phosphate coating or black chemical finish. See the appropriate
sections for limitations on use of each coating.
1.2 Classification.
1.2.1 Types and sizes. Screws furnished under this specification shall be of the
following types (see 6.2 and figure 7). Screws shall be classified according to size by
the nominal body diameter as specified in ASME B18.3. Sizes covered range from
#0 and up.
NOTE: Some of the parts covered by this document are for replacement purposes
only, and may not be included in new designs.
- Hexagon socket Head Cap Screw series.
- Socket Flat Countersunk Head Cap Screw angle.
Type VI - Socket Head Cap Screw
Type VIII - Socket Button Head Cap Screw
1/ DO NOT USE FOR NEW DESIGN (See 6.3.1)
AMSC N/A FSC 5305
Beneficial comments, recommendations, additions, deletions, clarifications, etc.
and any other data that may improve this document should be sent to: General
Services Administration, GSA Center (9FTE-10), Auburn, Washington 98001.
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