MIL-DTL-8789F
2.4 Order of precedence. In event of a conflict between the text of this document and the references
cited herein (except for related specification sheets), the text of this document takes precedence.
Nothing in this document, however, supersedes applicable laws and regulations unless a specific
exemption has been obtained.
3. REQUIREMENTS
3.1 Specification sheets. The individual item requirements shall be as specified herein and in
accordance with the applicable specification sheet. In the event of any conflict between the requirements
of this specification and the specification sheet, the latter shall govern.
3.2 Qualification. The fittings furnished under this specification shall be products that are authorized
by the qualifying activity for listing on the applicable qualified products list before contract award (see 4.5
and 6.3).
3.3 Materials. Materials used shall be as specified herein. However, materials not specified herein
shall be of a quality that will enable the fitting end to meet the requirements specified herein.
3.3.1 Recycled, recovered, or environmentally preferable materials. Recycled, recovered, or
environmentally preferable materials should be used to the maximum extent possible provided that the
material meets the operational and maintenance requirements, and promotes economically
advantageous life cycle costs.
3.3.2 Dissimilar metals. When dissimilar metals are used in intimate contact with each other,
protection against electrolysis and corrosion shall be provided. Dissimilar metals such as brass, copper
or steel (except corrosion-resisting steel passivated in accordance with SAE-AMS-2700, type 6 or 7) shall
not be used in intimate contact with aluminum or aluminum alloy. Protective measures for dissimilar
metals shall be in accordance with MIL-STD-889.
3.3.3 Electrical conductivity and hardness. Aluminum alloy fittings and nuts shall meet the electrical
conductivity and hardness requirements of SAE-ARP891 or equivalent.
3.3.4 Heat treatment.
3.3.4.1 Aluminum Alloy. Aluminum alloy fittings and nuts shall be supplied in the final temper as
specified in table 1. When fitting material is purchased in other than the final temper, the heat treatment
shall be in accordance with SAE-AMS-H-6088.
3.3.4.2 Steel. Corrosion-resistant steel fittings and nuts shall have a hardness of Rockwell B80
minimum. When required steel shall be heat treated in accordance with SAE-AMS-H-6875.
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