NSN 5310-01-737-7879, 5310017377879
WASHER,LOCK

Federal Supply Classification: FSC 5310 - Nuts and Washers
National Item Identification Number: NIIN 017377879
Codification Country: United States
Item Name Code: INC 14218
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.

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DLMS^® Summary

National Stock Number 5310-01-737-7879

National Stock Number (NSN) 5310-01-737-7879, or NIIN 017377879, (washer,lock) was assigned March 11, 2026 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. ISO Group has several sources of supply for this NSN.

This part number has not been procured by the US Government in over 5 years.

This NSN is assigned to Item Name Code (INC) 14218. [A WASHER, USUALLY ROUND, WITH A CENTRALLY-LOCATED HOLE. ITS EDGES AND TWO BEARING SURFACES ARE DESIGNED IN SUCH A WAY THAT APPLIED PRESSURE BRINGS INTO PLAY THE SPRING TENSION AND/OR FRICTIONAL LOCKING PRINCIPLE THAT MATERIALLY RESISTS ANY TENDENCY TOWARD TURNING. IT MAY BE MADE OF ONE OR TWO PIECES.]. 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 5310017377879 does not contain precious metals.

This information was last updated on Jul 01, 2026.

Technical Characteristics

HARDNESS RATING: (CQFM) 38.0 ROCKWELL C MINIMUM AND 46.0 ROCKWELL C MAXIMUM
HOLE DIAMETER: (AAUB) 0.377 INCHES MINIMUM AND 0.385 INCHES MAXIMUM
OUTSIDE DIAMETER: (ABKV) 0.680 INCHES MAXIMUM
MATERIAL DOCUMENT AND CLASSIFICATION: (MDCL) ASTM A29/A29M AEROSPACE MATERIAL SPEC STD ALL MATERIAL RESPONSES OVERALL
MATERIAL THICKNESS: (ABPX) 0.094 INCHES MINIMUM AND 0.104 INCHES MAXIMUM
MATERIAL: (MATT) STEEL OVERALL
PART NAME ASSIGNED BY CONTROLLING AGENCY: (CXCY) WASHER, LOCK-SPRING, HELICAL, REGULAR (MEDIUM) SERIES
SPECIAL FEATURES: (FEAT) NSN ASSIGNED IN SUPPORT OF ARMY CLEAN HARDWARE ABATEMENT INITIATIVE. MATERIAL: STEEL, CARBON, GRADE 1060 (UNS G10600) THRU 1080 (UNS G10800), IAW ASTM A29/A29M. ZINC-NICKEL PLATED IN ACCORDANCE WITH SAE AMS2461, TYPE II, CLASS 2, GRADE B. THE COLOR SHOULD BE LIGHT TO DARK GRAY, BUT COLOR SHALL NOT BE A CAUSE FOR REJECTION. CARBON STEEL WASHERS SHALL HAVE A HARDNESS OF 38-46 HRC.
SPECIFICATION/STANDARD DATA: (ZZZK) 80205-NAS-35338 PROFESSIONAL/INDUSTRIAL ASSOCIATION STANDARD
STYLE DESIGNATOR: (STYL) SPLIT HELICAL-RIGHT HAND
SURFACE TREATMENT DOCUMENT AND CLASSIFICATION: (STDC) SAE AMS2461, TYPE II, CLASS 2, GRADE B ASSN STD ALL TREATMENT RESPONSES OVERALL
SURFACE TREATMENT: (SFTT) ZINC NICKEL OVERALL