NPFC - MIL-HDBK-57
LISTING OF FASTENER MANUFACTURER’S IDENTIFICATION SYMBOLS
|Publication Date:||21 June 2011|
This handbook is a compilation of the identifying symbols of fastener manufacturers as provided by the manufacturers themselves. This issue contains the names, addresses, and the symbols of all fastener manufacturers whose identifying symbols were received by 30 November, 2006. Each manufacturer who was listed in Revision B of this document was contacted to confirm the accuracy of the published information. We have annotated the listing to indicate those manufacturers that have responded to confirm or update appropriate information. The listing also annotates which manufacturers have not responded. Information about manufacturers who have not responded is still maintained in this latest revision. For the purpose of this handbook, a manufacturer is defined as the source which substantially makes the supplies, either by hand or machinery out of raw materials. Fasteners, as defined for the purpose of this handbook, refer to those threaded items included in Federal Supply Class (FSC) 5305 - Screws, 5306 - Bolts, 5307 - Studs, and 5310 - Nuts. As additional manufacturers submit their markings, the handbook will be updated.
All requests to be listed in the handbook should be addressed to:
Defense Supply Center Philadelphia (DSCP)
700 Robbins Avenue.
Philadelphia, PA 19111-5096
or e-mail to
In addition to the alphabetic index of manufacturers (Index A), this revision of the handbook incorporates a listing of manufacturers indexed by their identification symbol (index B).
At the back of this handbook is a registration form. Manufacturers wishing to be listed must complete this form and return it to DSCP. Submit the completed form, along with your fastener identification symbol artwork used on the fastener. All submittals must be in the English language.
DSCP does not "approve", "rate", or "endorse" any item, construction, proprietary device, or activity.
DSCP is not responsible for the accuracy or completeness of the information contained in this publication.
DSCP does not take any position with respect to the validity of any patent rights asserted in connection with any items mentioned in this document, and does not undertake to insure anyone utilizing a code, standard, or guide against liability for infringement of any applicable Letters Patent, nor assume any such liability. Users of code, standard, or guide are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is entirely their own responsibility.
DSCP reserves the right to monitor this document to ensure that it contains the listing of only bona-fide fastener manufacturers.
DSCP has solicited the assistance of the Defense Contract Management Agency (DCMA) and the Defense Management Command International (DCMCI) in an effort to identify non-manufacturers and remove them from the manufacturers' listing. DCMA/DCMC's evaluation of a company's status is based on an in house capability to manufacture fasteners (screws, bolts, studs and nuts), with respect to space, equipment, and trained personnel. On an on-going basis, any company identified by DCAS/DCMCI as a non-manufacturer will be removed from the manufacturers' database and MIL-HDBK-57C (IS).