NSN 5310-00-167-0732, 5310001670732
WASHER,CONCAVE

Federal Supply Classification: FSC 5310 - Nuts and Washers
National Item Identification Number: NIIN 001670732
Codification Country: United States
Item Name Code: INC 15930
Criticality: (X) This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application.
Hazardous Material Indicator Code: (N) There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials.

Availability: Readily Available Qualified Suppliers: Currently qualifying suppliers

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DLMS^® Summary

National Stock Number 5310-00-167-0732

National Stock Number (NSN) 5310-00-167-0732, or NIIN 001670732, (washer,concave) was assigned January 1, 1963 in the Federal Logistics Information System (FLIS). This NIIN is Available for Manual Assignment. This NSN does not replace any other NSNs.

There are no manufacturer part numbers associated to this NSN.

This part number has not been procured by the US Government in over 5 years, with the most recent procurement date of Oct 21, 2016. There have been 2 contracts issued for this part number, with 2 awards given. There is minimal competition for this NSN. The US Government has awarded contracts to 2 different suppliers. The last contract numbers awarded were: SPE5E717V0347, SPE5E714M2035. The total value of the awarded contracts has been US$ 1,332.00.

This NSN is somewhat common among different platforms, belonging to 3 different weapons systems.

There has been very little demand for this national stock number. The demand for this NSN originated from less than 5 countries. Based on a planned procurement review by the Primary Inventory Control Activity (PICA) on Dec 13, 2013, this NSN's acquisition method was noted as: Suitable for Competitive Acquisition. (Potential sources shall include dealers/distributors.) The Government has unlimited rights to the technical data, and the data package is complete. Valid AMCs: 1 and 2.

This NSN is assigned to Item Name Code (INC) 15930. [A WASHER WHICH IS ROUND WITH A CENTRALLY LOCATED HOLE. ONE BEARING SURFACE IS SMOOTH, FLAT, AND UNBROKEN, THE OTHER BEARING SURFACE IS SMOOTH, UNBROKEN, AND IS RECESSED TO FORM A CURVED OR SPHERICAL CONTOUR. SEE ALSO WASHER (1), CONVEX. EXCLUDES:WASHER (1), RECESSED AND BEARING, WASHER, THRUST.]. This item does not have a nuclear hardened feature or any other critical feature such as tolerance, fit restriction or application. There is no data in the HMIRS and the NSN is in an FSC not generally suspected of containing hazardous materials. NSN 5310001670732 contains an unknown precious metal.

This information was last updated on Aug 01, 2025.

Technical Characteristics

SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: (STDC) UNABLE TO DECODE
MATERIAL: (MATT) STEEL OVERALL OR STEEL COMP 1008 OVERALL OR STEEL COMP 1009 OVERALL OR STEEL COMP 1015 OVERALL OR STEEL COMP 1018 OVERALL OR STEEL COMP 1020 OVERALL OR STEEL COMP 1018 OVERALL OR STEEL COMP 1025 OVERALL
SURFACE TREATMENT: (SFTT) UNABLE TO DECODE
MATERIAL DOCUMENT AND CLASSIFICATION: (MDCL) QQ-S-630 FED SPEC SINGLE MATERIAL RESPONSE OVERALL OR QQ-S-698 FED SPEC SINGLE MATERIAL RESPONSE OVERALL OR QQ-S-690 FED SPEC SINGLE MATERIAL RESPONSE OVERALL OR AISI ASSN STD SINGLE MATERIAL RESPONSE OVERALL
HARDNESS RATING: (CQFM) 70.0 ROCKWELL B MINIMUM AND 85.0 ROCKWELL B MAXIMUM
HOLE DIAMETER: (AAUB) 0.375 INCHES NOMINAL
MATERIAL DOCUMENT AND CLASSIFICATION: (MDCL) QQ-S-630 FED SPEC ALL MATERIAL RESPONSES OR QQ-S-698 FED SPEC 1ST MATERIAL RESPONSE OR QQ-S-690 FED SPEC ALL MATERIAL RESPONSES OR AISI ASSN STD ALL MATERIAL RESPONSES OVERALL
MATERIAL THICKNESS: (ABPX) 0.094 INCHES NOMINAL
MATERIAL: (MATT) STEEL OR STEEL COMP 1008 OR STEEL COMP 1009 OR STEEL COMP 1015 OR STEEL COMP 1018 OR STEEL COMP 1020 OR STEEL COMP 1025 OVERALL
OUTSIDE DIAMETER: (ABKV) 1.000 INCHES NOMINAL
RADIUS: (ABGG) 0.370 INCHES MINIMUM AND 0.380 INCHES MAXIMUM
RECESS DIAMETER: (ABMD) 0.500 INCHES NOMINAL
STYLE DESIGNATOR: (STYL) CONCAVE
SURFACE FINISH: (CSYM) 63.0 MICROINCHES ALL SURFACES
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: (STDC) QQ-P-416,TY 1,CL 2 FED SPEC SINGLE TREATMENT RESPONSE OVERALL
SURFACE TREATMENT: (SFTT) CADMIUM OVERALL
SURFACE FINISH: (CSYM) UNABLE TO DECODE