INCH-POUND
MIL-DTL-18240F
2 JUNE 1997
SUPERSEDING
MIL-F-18240E
1 DECEMBER 1989
DETAIL SPECIFICATION
FASTENER ELEMENT, SELF-LOCKING, THREADED FASTENER, 250°F MAXIMUM
This specification is approved for use by all Departments and Agencies of the Department of
Defense.
1. SCOPE
1.1 Scope. This specification defines the requirements for self-locking elements for use in
externally threaded fasteners such as bolts and screws to be used in fasteners with either UNC,
UNJC, UNF, UNJF, UNRC or UNRF threads and where the temperatures will not exceed 250°F.
1.2 Classification. This specification includes three types of self-locking elements as follows:
Type N . . . . . Plug/Pellet
Type L . . . . . Strip
Type P . . . . . Patch
Beneficial comments (recommendations, additions, deletions) and any pertinent data which
may be of use in improving this document should be addressed to: Commander, Naval Air
Warfare Center Aircraft Division, Code 414100B120-3, Highway 547, Lakehurst, NJ
08733-5100, by using the Standardization Document Improvement Proposal (DD Form
1426) appearing at the end of this document or by letter.
AMSC N/A
FSC 53GP.
DISTRIBUTION STATEMENT A. Approved for public release; distribution is unlimited.
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