MIL-DTL-45913D
AEROSPACE INDUSTRIES ASSOCIATION (AIA)
NASM 1312
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Fastener Test Methods
NASM1312-1
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Fastener Test Methods; Method 1 Salt Spray
NASM1312-6
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Fastener Test Methods; Method 6 Hardness
NASM25027
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Nut, Self-Locking, 250° F, 450° F and 800° F
(Copies of this document are available from https://www.aia-aerospace.org or the Aerospace Industries
Association, 1250 Eye Street NW, Washington DC 20005.)
2.4 Order of Precedence. Unless otherwise noted herein or in the contract, in the event of a conflict
between the text of this document and the references cited herein (except for related specification sheets), the test
of this document takes precedence. Nothing in this document, however, supercedes 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 Material.
3.2.1 Carbon and alloy steel. Regular hexagon and flanged hexagon locknuts shall be manufactured from
carbon or alloy steel of such a quality that the locknuts shall meet the mechanical properties (proof loads and
prevailing torque) specified in SAE J995 or TABLE 1.
3.2.2 Corrosion-resistant steel. Regular hexagon and flanged hexagon 300 series stainless steel locknuts
shall meet the chemical requirements of group 1 in ASTM F594. 316 series locknuts shall meet the chemical
requirements of group 2 in ASTM F594.
3.2.3 Brass. Regular hexagon and flanged hexagon locknuts shall meet the chemical requirements of
Naval Brass (Alloy 462 or 464) in ASTM F467.
3.2.4 Aluminum alloy. Regular hexagon and flanged hexagon locknuts shall be manufactured from SAE-
AMS-QQ-A-225/5, SAE-AMS-QQ-A-225/6, SAE-AMS-QQ-A-225/8 or SAE-AMS-QQ-A-225/10. Aluminum
alloy shall have a minimum tensile strength 62,000 psi.
3.3 Protective and surface finishes.
3.3.1 Carbon and alloy steel. Plating and protective finishes shall be as specified on the appropriate
specification sheet.
3.3.1.1 Cadmium plating. Cadmium plating shall be in accordance with SAE-AMS-QQ-P-416, Type II,
Class 3.
3.3.1.2 Zinc plating. Zinc plating shall be in accordance with ASTM B633, Type II, FE/ZN 5. A minimum
of twenty-three hours baking post plating shall be required to minimize the possibility of hydrogen embrittlement
on all zinc plated parts.
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