FF-B-575C
May 26, 1970
SUPERSEDING
Fed. Spec. FF-B-575B
September 12, 1960
Fed. Spec. FF-B-571A (In part)
January 9, 1934
FEDERAL SPECIFICATION
BOLTS, HEXAGON AND SQUARE
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 the physical and mechanical properties
of various types of hexagon and square head bolts having nominal diameters of
1/4 inch and larger.
1.2 Classification. Bolts shall be of the following types and sizes, as
specified (see 6.2).
1.2.1 Types.
Type I - Square head bolts.
Type II - Hexagon head bolts.
Type III - Heavy hexagon head bolts.
Type IV - Heavy hexagon head structural bolts.
1.2.2 Sizes. Bolts shall be classified according to size by the basic
thread diameter.
2. APPLICABLE DOCUMENTS
2.1 Specifications and standards. The following specifications and
standards, of the issues in effect on date of invitation for bids or request
for proposal, form a part of this specification to the extent specified herein:
Federal Specifications:
QQ-A-225/6 - Aluminum Alloy Bar, Rod and Wire; Rolled, Drawn or Cold
Finished, 2024.
QQ-B-637 - Brass, Naval: Rod, Wire, Shapes, Forgings and Flat
Products with Finished Edges (Bar, Flat Wire and Strip).
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